Minor refactoring

It's useful while running application with custom, non-official SSL certificate, e.g. while development process.

.gitignore

@@ -11,6 +11,7 @@
 # ----------------------------------------------------------------------------------------------------------------------
 ### Composer
 # ----------------------------------------------------------------------------------------------------------------------
+/composer.lock
 /composer.phar
 
 # ----------------------------------------------------------------------------------------------------------------------

composer.json

@@ -3,7 +3,7 @@
     "description": "Client of LimeSurvey API",
     "type": "library",
     "license": "MIT",
-    "version": "0.0.1",
+    "version": "0.0.7",
     "authors": [
         {
             "name": "Meritoo",
@@ -15,13 +15,13 @@
         "meritoo/common-library": "~0.0.1"
     },
     "require-dev": {
-        "phpunit/phpunit": "^4.8.35 || ^5.4.3",
+        "phpunit/phpunit": "^5.7",
-        "squizlabs/php_codesniffer": "^2.8",
+        "squizlabs/php_codesniffer": "^2.9",
         "phpmd/phpmd": "^2.6",
         "sebastian/phpcpd": "^3.0",
         "pdepend/pdepend": "^2.5",
         "phploc/phploc": "^4.0",
-        "friendsofphp/php-cs-fixer": "^2.5"
+        "friendsofphp/php-cs-fixer": "^2.6"
     },
     "autoload": {
         "psr-4": {

src/Meritoo/LimeSurvey/ApiClient/Client/Client.php

@@ -77,7 +77,8 @@ class Client
     public function run($method, $arguments = [])
     {
         /*
-         * Let's validate method
+         * Let's validate method.
+         * It's called in the JsonRpcClientManager::runMethod() too, but I want to verify it before getting session key.
          */
         $method = MethodType::getValidatedMethod($method);
 
@@ -92,7 +93,7 @@ class Client
             ->getSessionKey($username, $password);
 
         /*
-         * Use the session's key as of the method's arguments
+         * Use the session's key as one of the method's arguments
          */
         array_unshift($arguments, $sessionKey);
 
@@ -103,6 +104,18 @@ class Client
             ->getRpcClientManager()
             ->runMethod($method, $arguments);
 
+        /*
+         * Raw data is unknown?
+         * Let's use an empty array instead
+         *
+         * Required to avoid bug:
+         * Argument 2 passed to Meritoo\LimeSurvey\ApiClient\Result\Result::__construct() must be of the type array,
+         * null given
+         */
+        if (null === $rawData) {
+            $rawData = [];
+        }
+
         return new Result($method, $rawData);
     }
 

src/Meritoo/LimeSurvey/ApiClient/Configuration/ConnectionConfiguration.php

@@ -59,21 +59,33 @@ class ConnectionConfiguration
      */
     private $debugMode = false;
 
+    /**
+     * If is set to true, the SSL certificate verification is turned on. Otherwise - turned off.
+     * It's useful while running application with custom, non-official SSL certificate, e.g. while development process.
+     *
+     * @var bool
+     */
+    private $verifySslCertificate = true;
+
     /**
      * Class constructor
      *
-     * @param string $baseUrl   Base url. Protocol & domain.
+     * @param string $baseUrl              Base url. Protocol & domain.
-     * @param string $username  Name of user used to authenticate to LimeSurvey
+     * @param string $username             Name of user used to authenticate to LimeSurvey
-     * @param string $password  Password used to authenticate to LimeSurvey
+     * @param string $password             Password used to authenticate to LimeSurvey
-     * @param bool   $debugMode (optional) If is set to true, the "debug" mode is turned on. Otherwise - turned off.
+     * @param bool   $debugMode            (optional) If is set to true, the "debug" mode is turned on. Otherwise -
+     *                                     turned off.
+     * @param bool   $verifySslCertificate (optional) If is set to true, the SSL certificate verification is turned
+     *                                     on. Otherwise - turned off.
      */
-    public function __construct($baseUrl, $username, $password, $debugMode = false)
+    public function __construct($baseUrl, $username, $password, $debugMode = false, $verifySslCertificate = true)
     {
         $this
             ->setBaseUrl($baseUrl)
             ->setUsername($username)
             ->setPassword($password)
-            ->setDebugMode($debugMode);
+            ->setDebugMode($debugMode)
+            ->setVerifySslCertificate($verifySslCertificate);
     }
 
     /**
@@ -201,6 +213,30 @@ class ConnectionConfiguration
         return $this;
     }
 
+    /**
+     * Returns information if the SSL certificate verification is turned on
+     *
+     * @return bool
+     */
+    public function isVerifySslCertificateOn()
+    {
+        return $this->verifySslCertificate;
+    }
+
+    /**
+     * Sets information if the SSL certificate verification is turned on
+     *
+     * @param bool $verifySslCertificate (optional) If is set to true, the SSL certificate verification is turned on.
+     *                                   Otherwise - turned off.
+     * @return $this
+     */
+    public function setVerifySslCertificate($verifySslCertificate = true)
+    {
+        $this->verifySslCertificate = $verifySslCertificate;
+
+        return $this;
+    }
+
     /*
      * - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
      * Additional / extra methods (neither getters, nor setters)

src/Meritoo/LimeSurvey/ApiClient/Exception/CannotProcessDataException.php

@@ -0,0 +1,31 @@
+<?php
+
+/**
+ * (c) Meritoo.pl, http://www.meritoo.pl
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Meritoo\LimeSurvey\ApiClient\Exception;
+
+/**
+ * An exception used while raw data returned by the LimeSurvey's API cannot be processed
+ *
+ * @author    Krzysztof Niziol <krzysztof.niziol@meritoo.pl>
+ * @copyright Meritoo.pl
+ */
+class CannotProcessDataException extends \Exception
+{
+    /**
+     * Class constructor
+     *
+     * @param string $reason Reason why data cannot be processed, e.g. "Invalid user name or password"
+     */
+    public function __construct($reason)
+    {
+        $template = 'Raw data returned by the LimeSurvey\'s API cannot be processed. Reason: \'%s\'.';
+        $message = sprintf($template, $reason);
+
+        parent::__construct($message);
+    }
+}

src/Meritoo/LimeSurvey/ApiClient/Exception/InvalidResultOfMethodRunException.php

@@ -0,0 +1,45 @@
+<?php
+
+/**
+ * (c) Meritoo.pl, http://www.meritoo.pl
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Meritoo\LimeSurvey\ApiClient\Exception;
+
+use Exception;
+use Meritoo\Common\Utilities\Arrays;
+
+/**
+ * An exception used when an error occurred while running method
+ *
+ * @author    Krzysztof Niziol <krzysztof.niziol@meritoo.pl>
+ * @copyright Meritoo.pl
+ */
+class InvalidResultOfMethodRunException extends Exception
+{
+    /**
+     * Class constructor
+     *
+     * @param Exception $previousException The previous exception, source of an error
+     * @param string    $methodName        Name of called method
+     * @param array     $methodArguments   (optional) Arguments of the called method
+     */
+    public function __construct(Exception $previousException, $methodName, array $methodArguments = [])
+    {
+        $template = "Oops, an error occurred while running method. Is there everything ok? Details:\n"
+            . "- error: %s,\n"
+            . "- method: %s,\n"
+            . '- arguments: %s.';
+
+        if (empty($methodArguments)) {
+            $methodArguments = '(no arguments)';
+        } else {
+            $methodArguments = Arrays::valuesKeys2string($methodArguments, ', ', '=', '"');
+        }
+
+        $message = sprintf($template, $previousException->getMessage(), $methodName, $methodArguments);
+        parent::__construct($message, $previousException->getCode());
+    }
+}

src/Meritoo/LimeSurvey/ApiClient/Exception/UnknownInstanceOfResultItem.php

@@ -1,5 +1,11 @@
 <?php
 
+/**
+ * (c) Meritoo.pl, http://www.meritoo.pl
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
 namespace Meritoo\LimeSurvey\ApiClient\Exception;
 
 use Exception;

src/Meritoo/LimeSurvey/ApiClient/Manager/JsonRpcClientManager.php

@@ -3,7 +3,9 @@
 namespace Meritoo\LimeSurvey\ApiClient\Manager;
 
 use JsonRPC\Client as RpcClient;
+use JsonRPC\Exception\InvalidJsonFormatException;
 use Meritoo\LimeSurvey\ApiClient\Configuration\ConnectionConfiguration;
+use Meritoo\LimeSurvey\ApiClient\Exception\InvalidResultOfMethodRunException;
 use Meritoo\LimeSurvey\ApiClient\Exception\UnknownMethodException;
 use Meritoo\LimeSurvey\ApiClient\Type\MethodType;
 
@@ -47,14 +49,22 @@ class JsonRpcClientManager
      * @return mixed
      *
      * @throws UnknownMethodException
+     * @throws InvalidResultOfMethodRunException
      */
     public function runMethod($method, $arguments = [])
     {
+        $result = null;
         $method = MethodType::getValidatedMethod($method);
 
-        return $this
+        try {
-            ->getRpcClient()
+            $result = $this
-            ->execute($method, $arguments);
+                ->getRpcClient()
+                ->execute($method, $arguments);
+        } catch (InvalidJsonFormatException $exception) {
+            throw new InvalidResultOfMethodRunException($exception, $method);
+        }
+
+        return $result;
     }
 
     /**
@@ -75,7 +85,20 @@ class JsonRpcClientManager
              * The "debug" mode is turned on?
              */
             if ($this->connectionConfiguration->isDebugModeOn()) {
-                $this->rpcClient->getHttpClient()->withDebug();
+                $this
+                    ->rpcClient
+                    ->getHttpClient()
+                    ->withDebug();
+            }
+
+            /*
+             * The SSL certificate verification is turned off?
+             */
+            if (!$this->connectionConfiguration->isVerifySslCertificateOn()) {
+                $this
+                    ->rpcClient
+                    ->getHttpClient()
+                    ->withoutSslVerification();
             }
         }
 

src/Meritoo/LimeSurvey/ApiClient/Result/Collection/Participants.php

@@ -0,0 +1,143 @@
+<?php
+
+/**
+ * (c) Meritoo.pl, http://www.meritoo.pl
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Meritoo\LimeSurvey\ApiClient\Result\Collection;
+
+use Meritoo\Common\Collection\Collection;
+use Meritoo\Common\Exception\Method\DisabledMethodException;
+use Meritoo\LimeSurvey\ApiClient\Result\Item\Participant;
+
+/**
+ * Participants of survey.
+ * All participants grouped per survey.
+ *
+ * It's a collection of participants' collections.
+ * The survey ID is used as an index per each collection of participants, so they are grouped by survey.
+ *
+ * @author    Krzysztof Niziol <krzysztof.niziol@meritoo.pl>
+ * @copyright Meritoo.pl
+ */
+class Participants extends Collection
+{
+    /**
+     * {@inheritdoc}
+     */
+    public function add($element, $index = null)
+    {
+        throw new DisabledMethodException(__METHOD__, 'addParticipants');
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function addMultiple($elements, $useIndexes = false)
+    {
+        throw new DisabledMethodException(__METHOD__, 'addParticipants');
+    }
+
+    /**
+     * Adds participants of given survey
+     *
+     * @param Collection $participants Participants to add. Collection of Participant classes.
+     * @param int        $surveyId     ID of survey
+     * @return $this
+     */
+    public function addParticipants(Collection $participants, $surveyId)
+    {
+        /*
+         * No participants?
+         * Nothing to do
+         */
+        if ($participants->isEmpty()) {
+            return $this;
+        }
+
+        $this
+            ->getBySurvey($surveyId)
+            ->addMultiple($participants);
+
+        return $this;
+    }
+
+    /**
+     * Adds participant of given survey
+     *
+     * @param Participant $participant Participant to add
+     * @param int         $surveyId    ID of survey
+     * @return $this
+     */
+    public function addParticipant(Participant $participant, $surveyId)
+    {
+        $this
+            ->getBySurvey($surveyId)
+            ->add($participant);
+
+        return $this;
+    }
+
+    /**
+     * Returns information if there are participants of given survey
+     *
+     * @param int $surveyId ID of survey
+     * @return bool
+     */
+    public function hasParticipantsOfSurvey($surveyId)
+    {
+        return false === $this
+                ->getBySurvey($surveyId)
+                ->isEmpty();
+    }
+
+    /**
+     * Returns participants of given survey
+     *
+     * If there are no participants of given survey, adds an empty collection who will store participants.
+     * So, this method will return collection always.
+     *
+     * @param int $surveyId ID of survey
+     * @return Collection
+     */
+    public function getBySurvey($surveyId)
+    {
+        /*
+         * There are no participants of given survey?
+         * Let's add an empty collection who will store participants
+         */
+        if (!isset($this[$surveyId])) {
+            $this[$surveyId] = new Collection();
+        }
+
+        return $this[$surveyId];
+    }
+
+    /**
+     * Returns participant of given survey
+     *
+     * @param int    $surveyId         ID of survey
+     * @param string $participantEmail E-mail of searched participant
+     * @return Participant|null
+     */
+    public function getParticipantOfSurvey($surveyId, $participantEmail)
+    {
+        /* @var Collection $participants */
+        $participants = $this->getBySurvey($surveyId);
+
+        if ($participants->isEmpty()) {
+            return null;
+        }
+
+        /* @var Participant $participant */
+        foreach ($participants as $participant) {
+            if ($participant->getEmail() == $participantEmail) {
+                return $participant;
+            }
+        }
+
+        return null;
+    }
+}

src/Meritoo/LimeSurvey/ApiClient/Result/Processor/ResultProcessor.php

@@ -55,9 +55,9 @@ class ResultProcessor
          */
         if (MethodType::isResultIterable($method)) {
             $items = [];
-            $emptyItem = clone $item;
 
             foreach ($rawData as $itemData) {
+                $emptyItem = clone $item;
                 $items[] = $emptyItem->setValues($itemData);
             }
 
@@ -81,6 +81,7 @@ class ResultProcessor
         $method = MethodType::getValidatedMethod($method);
 
         switch ($method) {
+            case MethodType::ADD_PARTICIPANTS:
             case MethodType::GET_PARTICIPANT_PROPERTIES:
                 $item = new Participant();
                 break;

src/Meritoo/LimeSurvey/ApiClient/Result/Result.php

@@ -10,6 +10,7 @@ namespace Meritoo\LimeSurvey\ApiClient\Result;
 
 use Meritoo\Common\Collection\Collection;
 use Meritoo\LimeSurvey\ApiClient\Base\Result\BaseItem;
+use Meritoo\LimeSurvey\ApiClient\Exception\CannotProcessDataException;
 use Meritoo\LimeSurvey\ApiClient\Result\Processor\ResultProcessor;
 use Meritoo\LimeSurvey\ApiClient\Type\MethodType;
 
@@ -35,6 +36,13 @@ class Result
      */
     private $rawData;
 
+    /**
+     * Status, information returned instead of usual/normal result
+     *
+     * @var string
+     */
+    private $status;
+
     /**
      * Processor of the raw data fetched while talking to the LimeSurvey's API
      *
@@ -52,7 +60,7 @@ class Result
     public function __construct($method, array $rawData)
     {
         $this->method = MethodType::getValidatedMethod($method);
-        $this->rawData = $rawData;
+        $this->setRawDataAndStatus($rawData);
     }
 
     /**
@@ -71,14 +79,41 @@ class Result
      * @param bool $raw (optional) If is set to true, raw data provided by the LimeSurvey's API will be returned.
      *                  Otherwise - prepared/processed.
      * @return array|Collection|BaseItem
+     * @throws CannotProcessDataException
      */
     public function getData($raw = false)
     {
+        /*
+         * Raw data should be returned only?
+         * Let's do it
+         */
         if ($raw) {
             return $this->rawData;
         }
 
-        return $this->getProcessedData($this->rawData);
+        /*
+         * Status is unknown?
+         * Let's process the raw data
+         */
+        if (empty($this->status)) {
+            return $this->getProcessedData($this->rawData);
+        }
+
+        /*
+         * Oops, the raw data returned by the LimeSurvey's API cannot be processed, because status was provided.
+         * Well, probably something is broken and... there is no data.
+         */
+        throw new CannotProcessDataException($this->status);
+    }
+
+    /**
+     * Returns status, information returned instead of usual/normal result
+     *
+     * @return string
+     */
+    public function getStatus()
+    {
+        return $this->status;
     }
 
     /**
@@ -119,4 +154,23 @@ class Result
 
         return $this->resultProcessor;
     }
+
+    /**
+     * Sets status, information returned instead of usual/normal result and raw data returned by the LimeSurvey's API
+     *
+     * @param array $rawData Raw data returned by the LimeSurvey's API
+     */
+    private function setRawDataAndStatus(array $rawData)
+    {
+        /*
+         * Status was provided?
+         * Well, probably something is broken and... there is no data
+         */
+        if (isset($rawData['status'])) {
+            $this->status = trim($rawData['status']);
+            $rawData = [];
+        }
+
+        $this->rawData = $rawData;
+    }
 }

src/Meritoo/LimeSurvey/ApiClient/Service/ParticipantService.php

@@ -0,0 +1,142 @@
+<?php
+
+/**
+ * (c) Meritoo.pl, http://www.meritoo.pl
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Meritoo\LimeSurvey\ApiClient\Service;
+
+use Meritoo\Common\Collection\Collection;
+use Meritoo\LimeSurvey\ApiClient\Client\Client;
+use Meritoo\LimeSurvey\ApiClient\Result\Collection\Participants;
+use Meritoo\LimeSurvey\ApiClient\Result\Item\Participant;
+use Meritoo\LimeSurvey\ApiClient\Type\MethodType;
+
+/**
+ * Serves participants
+ *
+ * @author    Krzysztof Niziol <krzysztof.niziol@meritoo.pl>
+ * @copyright Meritoo.pl
+ */
+class ParticipantService
+{
+    /**
+     * Client of the LimeSurvey's API
+     *
+     * @var Client
+     */
+    private $client;
+
+    /**
+     * Participants of survey.
+     * All participants grouped per survey.
+     *
+     * @var Participants
+     */
+    private $allParticipants;
+
+    /**
+     * Class constructor
+     *
+     * @param Client       $client          Client of the LimeSurvey's API
+     * @param Participants $allParticipants (optional) Participants of survey. All participants grouped per survey.
+     */
+    public function __construct(Client $client, Participants $allParticipants = null)
+    {
+        if (null === $allParticipants) {
+            $allParticipants = new Participants();
+        }
+
+        $this->client = $client;
+        $this->allParticipants = $allParticipants;
+    }
+
+    /**
+     * Returns participants of given survey
+     *
+     * @param int $surveyId ID of survey
+     * @return Collection
+     */
+    public function getSurveyParticipants($surveyId)
+    {
+        $hasSurvey = $this
+            ->allParticipants
+            ->hasParticipantsOfSurvey($surveyId);
+
+        if (!$hasSurvey) {
+            $arguments = [
+                $surveyId,
+            ];
+
+            $participants = $this
+                ->client
+                ->run(MethodType::LIST_PARTICIPANTS, $arguments)
+                ->getData();
+
+            $this
+                ->allParticipants
+                ->addParticipants($participants, $surveyId);
+        }
+
+        return $this
+            ->allParticipants
+            ->getBySurvey($surveyId);
+    }
+
+    /**
+     * Returns information if given survey has participant with given e-mail
+     *
+     * @param int    $surveyId ID of survey
+     * @param string $email    E-mail address of the participant
+     * @return bool
+     */
+    public function hasParticipant($surveyId, $email)
+    {
+        /*
+         * I have to get all participants of survey to avoid problem when participants exist but are not loaded
+         */
+        $this->getSurveyParticipants($surveyId);
+
+        return null !== $this
+                ->allParticipants
+                ->getParticipantOfSurvey($surveyId, $email);
+    }
+
+    /**
+     * Adds participant with given data to survey with given ID
+     *
+     * @param int    $surveyId  ID of survey
+     * @param string $firstName First name of the participant to add
+     * @param string $lastName  Last ame of the participant to add
+     * @param string $email     E-mail address of the participant to add
+     * @return Participant
+     */
+    public function addParticipant($surveyId, $firstName, $lastName, $email)
+    {
+        $participantsData = [
+            [
+                'firstname' => $firstName,
+                'lastname'  => $lastName,
+                'email'     => $email,
+            ],
+        ];
+
+        $arguments = [
+            $surveyId,
+            $participantsData,
+        ];
+
+        $participantCollection = $this
+            ->client
+            ->run(MethodType::ADD_PARTICIPANTS, $arguments)
+            ->getData();
+
+        $this
+            ->allParticipants
+            ->addParticipants($participantCollection, $surveyId);
+
+        return $participantCollection->getFirst();
+    }
+}

src/Meritoo/LimeSurvey/ApiClient/Service/SurveyService.php

@@ -0,0 +1,104 @@
+<?php
+
+/**
+ * (c) Meritoo.pl, http://www.meritoo.pl
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Meritoo\LimeSurvey\ApiClient\Service;
+
+use Meritoo\Common\Collection\Collection;
+use Meritoo\LimeSurvey\ApiClient\Client\Client;
+use Meritoo\LimeSurvey\ApiClient\Result\Item\Survey;
+use Meritoo\LimeSurvey\ApiClient\Type\MethodType;
+
+/**
+ * Serves surveys
+ *
+ * @author    Krzysztof Niziol <krzysztof.niziol@meritoo.pl>
+ * @copyright Meritoo.pl
+ */
+class SurveyService
+{
+    /**
+     * Client of the LimeSurvey's API
+     *
+     * @var Client
+     */
+    private $client;
+
+    /**
+     * All surveys
+     *
+     * @var Collection
+     */
+    private $allSurveys;
+
+    /**
+     * Class constructor
+     *
+     * @param Client     $client     Client of the LimeSurvey's API
+     * @param Collection $allSurveys (optional) All surveys
+     */
+    public function __construct(Client $client, Collection $allSurveys = null)
+    {
+        if (null === $allSurveys) {
+            $allSurveys = new Collection();
+        }
+
+        $this->client = $client;
+        $this->allSurveys = $allSurveys;
+    }
+
+    /**
+     * Returns all surveys
+     *
+     * @return Collection
+     */
+    public function getAllSurveys()
+    {
+        if ($this->allSurveys->isEmpty()) {
+            $surveys = $this
+                ->client
+                ->run(MethodType::LIST_SURVEYS)
+                ->getData();
+
+            if (null !== $surveys) {
+                $this->allSurveys = $surveys;
+            }
+        }
+
+        return $this->allSurveys;
+    }
+
+    /**
+     * Returns information if survey with given ID exists
+     *
+     * @param int $surveyId ID of survey to verify
+     * @return bool
+     */
+    public function isExistingSurvey($surveyId)
+    {
+        $allSurveys = $this->getAllSurveys();
+
+        /*
+         * No surveys?
+         * Nothing to do
+         */
+        if ($allSurveys->isEmpty()) {
+            return false;
+        }
+
+        $surveyId = (int)$surveyId;
+
+        /* @var Survey $survey */
+        foreach ($allSurveys as $survey) {
+            if ($survey->getId() == $surveyId) {
+                return true;
+            }
+        }
+
+        return false;
+    }
+}

src/Meritoo/LimeSurvey/ApiClient/Type/MethodType.php

@@ -19,6 +19,16 @@ use Meritoo\LimeSurvey\ApiClient\Exception\UnknownMethodException;
  */
 class MethodType extends BaseType
 {
+    /**
+     * Add participants to the tokens collection of the survey
+     *
+     * Returns the inserted data including additional new information like the Token entry ID and the token string.
+     * In case of errors in some data, return it in errors.
+     *
+     * @var string
+     */
+    const ADD_PARTICIPANTS = 'add_participants';
+
     /**
      * Add a response to the survey responses collection.
      * Returns the id of the inserted survey response.
@@ -86,7 +96,7 @@ class MethodType extends BaseType
      */
     public static function getValidatedMethod($method)
     {
-        if ((new static())->isCorrectType($method)) {
+        if ((new static())->isCorrectType($method) || (new SystemMethodType())->isCorrectType($method)) {
             return $method;
         }
 
@@ -104,6 +114,7 @@ class MethodType extends BaseType
         $method = static::getValidatedMethod($method);
 
         return in_array($method, [
+            static::ADD_PARTICIPANTS,
             static::LIST_PARTICIPANTS,
             static::LIST_QUESTIONS,
             static::LIST_SURVEYS,

tests/Meritoo/LimeSurvey/Test/ApiClient/Base/Result/BaseItemTest.php

@@ -8,9 +8,8 @@
 
 namespace Meritoo\LimeSurvey\Test\ApiClient\Base\Result;
 
+use Meritoo\Common\Test\Base\BaseTestCase;
 use Meritoo\LimeSurvey\ApiClient\Base\Result\BaseItem;
-use PHPUnit_Framework_TestCase;
-use ReflectionClass;
 
 /**
  * Test case of the base class for one item of result/data fetched while talking to the LimeSurvey's API
@@ -18,14 +17,11 @@ use ReflectionClass;
  * @author    Krzysztof Niziol <krzysztof.niziol@meritoo.pl>
  * @copyright Meritoo.pl
  */
-class BaseItemTest extends PHPUnit_Framework_TestCase
+class BaseItemTest extends BaseTestCase
 {
     public function testConstructorVisibilityAndArguments()
     {
-        $reflection = new ReflectionClass(BaseItem::class);
+        static::assertHasNoConstructor(BaseItem::class);
-        $constructor = $reflection->getConstructor();
-
-        static::assertNull($constructor);
     }
 
     public function testSetValues()

tests/Meritoo/LimeSurvey/Test/ApiClient/Client/ClientTest.php

@@ -34,6 +34,11 @@ class ClientTest extends BaseTestCase
      */
     private $configuration;
 
+    public function testConstructorVisibilityAndArguments()
+    {
+        static::assertConstructorVisibilityAndArguments(Client::class, OopVisibilityType::IS_PUBLIC, 3, 1);
+    }
+
     /**
      * @param string $incorrectMethod Incorrect name of method to call
      * @dataProvider provideIncorrectMethod
@@ -71,12 +76,12 @@ class ClientTest extends BaseTestCase
 
     public function testGetRpcClientManagerVisibilityAndArguments()
     {
-        $this->verifyMethodVisibilityAndArguments(Client::class, 'getRpcClientManager', OopVisibilityType::IS_PRIVATE);
+        static::assertMethodVisibilityAndArguments(Client::class, 'getRpcClientManager', OopVisibilityType::IS_PRIVATE);
     }
 
     public function testGetSessionManagerVisibilityAndArguments()
     {
-        $this->verifyMethodVisibilityAndArguments(Client::class, 'getRpcClientManager', OopVisibilityType::IS_PRIVATE);
+        static::assertMethodVisibilityAndArguments(Client::class, 'getRpcClientManager', OopVisibilityType::IS_PRIVATE);
     }
 
     /**

tests/Meritoo/LimeSurvey/Test/ApiClient/Configuration/ConnectionConfigurationTest.php

@@ -11,6 +11,7 @@ namespace Meritoo\LimeSurvey\Test\ApiClient\Configuration;
 use Generator;
 use Meritoo\Common\Exception\Regex\InvalidUrlException;
 use Meritoo\Common\Test\Base\BaseTestCase;
+use Meritoo\Common\Type\OopVisibilityType;
 use Meritoo\LimeSurvey\ApiClient\Configuration\ConnectionConfiguration;
 
 /**
@@ -21,6 +22,25 @@ use Meritoo\LimeSurvey\ApiClient\Configuration\ConnectionConfiguration;
  */
 class ConnectionConfigurationTest extends BaseTestCase
 {
+    /**
+     * Configuration with default values of optional constructor's arguments
+     *
+     * @var ConnectionConfiguration
+     */
+    private $configurationWithDefaults;
+
+    /**
+     * Configuration without default values of optional constructor's arguments
+     *
+     * @var ConnectionConfiguration
+     */
+    private $configurationAnother;
+
+    public function testConstructorVisibilityAndArguments()
+    {
+        static::assertConstructorVisibilityAndArguments(ConnectionConfiguration::class, OopVisibilityType::IS_PUBLIC, 5, 3);
+    }
+
     /**
      * @param mixed $emptyBaseUrl Empty base url
      * @dataProvider provideEmptyBaseUrl
@@ -43,69 +63,92 @@ class ConnectionConfigurationTest extends BaseTestCase
 
     public function testConstructor()
     {
-        $configuration = new ConnectionConfiguration('http://test.com', 'test1', 'test2');
+        static::assertEquals('http://test.com', $this->configurationWithDefaults->getBaseUrl());
+        static::assertEquals('test1', $this->configurationWithDefaults->getUsername());
+        static::assertEquals('test2', $this->configurationWithDefaults->getPassword());
+        static::assertFalse($this->configurationWithDefaults->isDebugModeOn());
+        static::assertTrue($this->configurationWithDefaults->isVerifySslCertificateOn());
 
-        static::assertEquals('http://test.com', $configuration->getBaseUrl());
+        static::assertEquals('http://lets-test.com', $this->configurationAnother->getBaseUrl());
-        static::assertEquals('test1', $configuration->getUsername());
+        static::assertEquals('test11', $this->configurationAnother->getUsername());
-        static::assertEquals('test2', $configuration->getPassword());
+        static::assertEquals('test22', $this->configurationAnother->getPassword());
-        static::assertFalse($configuration->isDebugModeOn());
+        static::assertTrue($this->configurationAnother->isDebugModeOn());
+        static::assertFalse($this->configurationAnother->isVerifySslCertificateOn());
     }
 
     public function testSetBaseUrl()
     {
-        $configuration = new ConnectionConfiguration('http://test.com', 'test1', 'test2');
+        $this->configurationWithDefaults->setBaseUrl('http://lorem.ipsum');
+        static::assertEquals('http://lorem.ipsum', $this->configurationWithDefaults->getBaseUrl());
 
-        $configuration->setBaseUrl('http://lorem.ipsum');
+        $this->configurationWithDefaults->setBaseUrl('http://lorem.ipsum/');
-        static::assertEquals('http://lorem.ipsum', $configuration->getBaseUrl());
+        static::assertEquals('http://lorem.ipsum', $this->configurationWithDefaults->getBaseUrl());
-
-        $configuration->setBaseUrl('http://lorem.ipsum/');
-        static::assertEquals('http://lorem.ipsum', $configuration->getBaseUrl());
     }
 
     public function testSetRemoteControlUrl()
     {
-        $configuration = new ConnectionConfiguration('http://test.com', 'test1', 'test2');
+        $this->configurationWithDefaults->setRemoteControlUrl('/lorem/ipsum');
-        $configuration->setRemoteControlUrl('/lorem/ipsum');
+        static::assertEquals('/lorem/ipsum', $this->configurationWithDefaults->getRemoteControlUrl());
-
-        static::assertEquals('/lorem/ipsum', $configuration->getRemoteControlUrl());
     }
 
     public function testSetUsername()
     {
-        $configuration = new ConnectionConfiguration('http://test.com', 'test1', 'test2');
+        $this->configurationWithDefaults->setUsername('lorem');
-        $configuration->setUsername('lorem');
+        static::assertEquals('lorem', $this->configurationWithDefaults->getUsername());
-
-        static::assertEquals('lorem', $configuration->getUsername());
     }
 
     public function testSetPassword()
     {
-        $configuration = new ConnectionConfiguration('http://test.com', 'test1', 'test2');
+        $this->configurationWithDefaults->setPassword('ipsum');
-        $configuration->setPassword('ipsum');
+        static::assertEquals('ipsum', $this->configurationWithDefaults->getPassword());
-
-        static::assertEquals('ipsum', $configuration->getPassword());
     }
 
     public function testSetDebugMode()
     {
-        $configuration = new ConnectionConfiguration('http://test.com', 'test1', 'test2');
+        $this->configurationWithDefaults->setDebugMode();
+        $this->configurationAnother->setDebugMode();
 
-        $configuration->setDebugMode();
+        static::assertFalse($this->configurationWithDefaults->isDebugModeOn());
-        static::assertFalse($configuration->isDebugModeOn());
+        static::assertFalse($this->configurationAnother->isDebugModeOn());
 
-        $configuration->setDebugMode(false);
+        $this->configurationWithDefaults->setDebugMode(false);
-        static::assertFalse($configuration->isDebugModeOn());
+        $this->configurationAnother->setDebugMode(false);
 
-        $configuration->setDebugMode(true);
+        static::assertFalse($this->configurationWithDefaults->isDebugModeOn());
-        static::assertTrue($configuration->isDebugModeOn());
+        static::assertFalse($this->configurationAnother->isDebugModeOn());
+
+        $this->configurationWithDefaults->setDebugMode(true);
+        $this->configurationAnother->setDebugMode(true);
+
+        static::assertTrue($this->configurationWithDefaults->isDebugModeOn());
+        static::assertTrue($this->configurationAnother->isDebugModeOn());
+    }
+
+    public function testSetVerifySslCertificate()
+    {
+        $this->configurationWithDefaults->setVerifySslCertificate();
+        $this->configurationAnother->setVerifySslCertificate();
+
+        static::assertTrue($this->configurationWithDefaults->isVerifySslCertificateOn());
+        static::assertTrue($this->configurationAnother->isVerifySslCertificateOn());
+
+        $this->configurationWithDefaults->setVerifySslCertificate(false);
+        $this->configurationAnother->setVerifySslCertificate(false);
+
+        static::assertFalse($this->configurationWithDefaults->isVerifySslCertificateOn());
+        static::assertFalse($this->configurationAnother->isVerifySslCertificateOn());
+
+        $this->configurationWithDefaults->setVerifySslCertificate(true);
+        $this->configurationAnother->setVerifySslCertificate(true);
+
+        static::assertTrue($this->configurationWithDefaults->isVerifySslCertificateOn());
+        static::assertTrue($this->configurationAnother->isVerifySslCertificateOn());
     }
 
     public function testGetFullUrl()
     {
-        $configuration = new ConnectionConfiguration('http://test.com', 'test1', 'test2');
+        $this->configurationWithDefaults->setRemoteControlUrl('lorem/ipsum');
-        $configuration->setRemoteControlUrl('lorem/ipsum');
+        static::assertEquals('http://test.com/lorem/ipsum', $this->configurationWithDefaults->getFullUrl());
-
-        static::assertEquals('http://test.com/lorem/ipsum', $configuration->getFullUrl());
     }
 
     /**
@@ -143,4 +186,15 @@ class ConnectionConfigurationTest extends BaseTestCase
             'htp:/dolor.com',
         ];
     }
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function setUp()
+    {
+        parent::setUp();
+
+        $this->configurationWithDefaults = new ConnectionConfiguration('http://test.com', 'test1', 'test2');
+        $this->configurationAnother = new ConnectionConfiguration('http://lets-test.com', 'test11', 'test22', true, false);
+    }
 }

tests/Meritoo/LimeSurvey/Test/ApiClient/Exception/CannotProcessDataExceptionTest.php

@@ -0,0 +1,60 @@
+<?php
+
+/**
+ * (c) Meritoo.pl, http://www.meritoo.pl
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Meritoo\LimeSurvey\Test\ApiClient\Exception;
+
+use Generator;
+use Meritoo\Common\Test\Base\BaseTestCase;
+use Meritoo\Common\Type\OopVisibilityType;
+use Meritoo\LimeSurvey\ApiClient\Exception\CannotProcessDataException;
+
+/**
+ * Test case of an exception used while raw data returned by the LimeSurvey's API cannot be processed
+ *
+ * @author    Krzysztof Niziol <krzysztof.niziol@meritoo.pl>
+ * @copyright Meritoo.pl
+ */
+class CannotProcessDataExceptionTest extends BaseTestCase
+{
+    public function testConstructorVisibilityAndArguments()
+    {
+        static::assertConstructorVisibilityAndArguments(CannotProcessDataException::class, OopVisibilityType::IS_PUBLIC, 1, 1);
+    }
+
+    /**
+     * @param string $reason          Reason why data cannot be processed, e.g. "Invalid user name or password"
+     * @param string $expectedMessage Expected exception's message
+     *
+     * @dataProvider provideReason
+     */
+    public function testConstructorMessage($reason, $expectedMessage)
+    {
+        $exception = new CannotProcessDataException($reason);
+        static::assertEquals($expectedMessage, $exception->getMessage());
+    }
+
+    /**
+     * Provides reason why data cannot be processed
+     *
+     * @return Generator
+     */
+    public function provideReason()
+    {
+        $template = 'Raw data returned by the LimeSurvey\'s API cannot be processed. Reason: \'%s\'.';
+
+        yield[
+            'unknown',
+            sprintf($template, 'unknown'),
+        ];
+
+        yield[
+            'Invalid user name or password',
+            sprintf($template, 'Invalid user name or password'),
+        ];
+    }
+}

tests/Meritoo/LimeSurvey/Test/ApiClient/Exception/CreateSessionKeyFailedExceptionTest.php

@@ -0,0 +1,61 @@
+<?php
+
+/**
+ * (c) Meritoo.pl, http://www.meritoo.pl
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Meritoo\LimeSurvey\Test\ApiClient\Exception;
+
+use Generator;
+use Meritoo\Common\Test\Base\BaseTestCase;
+use Meritoo\Common\Type\OopVisibilityType;
+use Meritoo\LimeSurvey\ApiClient\Exception\CreateSessionKeyFailedException;
+
+/**
+ * Test case of an exception used while create of the session key has failed
+ *
+ * @author    Krzysztof Niziol <krzysztof.niziol@meritoo.pl>
+ * @copyright Meritoo.pl
+ */
+class CreateSessionKeyFailedExceptionTest extends BaseTestCase
+{
+    public function testConstructorVisibilityAndArguments()
+    {
+        static::assertConstructorVisibilityAndArguments(CreateSessionKeyFailedException::class, OopVisibilityType::IS_PUBLIC, 1, 0);
+    }
+
+    /**
+     * @param string $reason          Reason of failure, e.g. "Invalid user name or password"
+     * @param string $expectedMessage Expected exception's message
+     *
+     * @dataProvider provideReason
+     */
+    public function testConstructorMessage($reason, $expectedMessage)
+    {
+        $exception = new CreateSessionKeyFailedException($reason);
+        static::assertEquals($expectedMessage, $exception->getMessage());
+    }
+
+    /**
+     * Provides reason of failure
+     *
+     * @return Generator
+     */
+    public function provideReason()
+    {
+        $shortMessage = 'Create of the session key has failed';
+        $longMessageTemplate = sprintf('%s. Reason: \'%s\'.', $shortMessage, '%s');
+
+        yield[
+            '',
+            $shortMessage,
+        ];
+
+        yield[
+            'Invalid user name or password',
+            sprintf($longMessageTemplate, 'Invalid user name or password'),
+        ];
+    }
+}

tests/Meritoo/LimeSurvey/Test/ApiClient/Exception/InvalidResultOfMethodRunExceptionTest.php

@@ -0,0 +1,75 @@
+<?php
+
+/**
+ * (c) Meritoo.pl, http://www.meritoo.pl
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Meritoo\LimeSurvey\Test\ApiClient\Exception;
+
+use Exception;
+use Generator;
+use Meritoo\Common\Test\Base\BaseTestCase;
+use Meritoo\Common\Type\OopVisibilityType;
+use Meritoo\LimeSurvey\ApiClient\Exception\InvalidResultOfMethodRunException;
+use Meritoo\LimeSurvey\ApiClient\Type\MethodType;
+
+/**
+ * Test case of an exception used when an error occurred while running method
+ *
+ * @author    Krzysztof Niziol <krzysztof.niziol@meritoo.pl>
+ * @copyright Meritoo.pl
+ */
+class InvalidResultOfMethodRunExceptionTest extends BaseTestCase
+{
+    public function testConstructorVisibilityAndArguments()
+    {
+        static::assertConstructorVisibilityAndArguments(InvalidResultOfMethodRunException::class, OopVisibilityType::IS_PUBLIC, 3, 2);
+    }
+
+    /**
+     * @param Exception $previousException The previous exception, source of an error
+     * @param string    $methodName        Name of called method
+     * @param array     $methodArguments   Arguments of the called method
+     * @param string    $expectedMessage   Expected exception's message
+     *
+     * @dataProvider providePreviousExceptionAndMethod
+     */
+    public function testConstructorMessage(Exception $previousException, $methodName, array $methodArguments, $expectedMessage)
+    {
+        $exception = new InvalidResultOfMethodRunException($previousException, $methodName, $methodArguments);
+        static::assertEquals($expectedMessage, $exception->getMessage());
+    }
+
+    /**
+     * Provides previous exception, name and arguments of called method
+     *
+     * @return Generator
+     */
+    public function providePreviousExceptionAndMethod()
+    {
+        $template = "Oops, an error occurred while running method. Is there everything ok? Details:\n"
+            . "- error: %s,\n"
+            . "- method: %s,\n"
+            . '- arguments: %s.';
+
+        yield[
+            new Exception('Lorem ipsum'),
+            MethodType::ADD_RESPONSE,
+            [],
+            sprintf($template, 'Lorem ipsum', MethodType::ADD_RESPONSE, '(no arguments)'),
+        ];
+
+        yield[
+            new Exception('Dolor sit amet'),
+            MethodType::LIST_SURVEYS,
+            [
+                'fist_name' => 'John',
+                'last_name' => 'Scott',
+                'email'     => 'john@scott.com',
+            ],
+            sprintf($template, 'Dolor sit amet', MethodType::LIST_SURVEYS, 'fist_name="John", last_name="Scott", email="john@scott.com"'),
+        ];
+    }
+}

tests/Meritoo/LimeSurvey/Test/ApiClient/Exception/UnknownInstanceOfResultItemTest.php

@@ -0,0 +1,65 @@
+<?php
+
+/**
+ * (c) Meritoo.pl, http://www.meritoo.pl
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Meritoo\LimeSurvey\Test\ApiClient\Exception;
+
+use Generator;
+use Meritoo\Common\Test\Base\BaseTestCase;
+use Meritoo\Common\Type\OopVisibilityType;
+use Meritoo\LimeSurvey\ApiClient\Exception\UnknownInstanceOfResultItem;
+use Meritoo\LimeSurvey\ApiClient\Result\Processor\ResultProcessor;
+use Meritoo\LimeSurvey\ApiClient\Type\MethodType;
+
+/**
+ * Test case of an exception used while instance of one item used by result, with data fetched from the LimeSurvey's
+ * API, is unknown
+ *
+ * @author    Krzysztof Niziol <krzysztof.niziol@meritoo.pl>
+ * @copyright Meritoo.pl
+ */
+class UnknownInstanceOfResultItemTest extends BaseTestCase
+{
+    public function testConstructorVisibilityAndArguments()
+    {
+        static::assertConstructorVisibilityAndArguments(UnknownInstanceOfResultItem::class, OopVisibilityType::IS_PUBLIC, 1, 1);
+    }
+
+    /**
+     * @param string $method          Name of called method while talking to the LimeSurvey's API. One of the
+     *                                MethodType class constants.
+     * @param string $expectedMessage Expected exception's message
+     *
+     * @dataProvider provideMethodName
+     */
+    public function testConstructorMessage($method, $expectedMessage)
+    {
+        $exception = new UnknownInstanceOfResultItem($method);
+        static::assertEquals($expectedMessage, $exception->getMessage());
+    }
+
+    /**
+     * Provides name of called method
+     *
+     * @return Generator
+     */
+    public function provideMethodName()
+    {
+        $template = 'Instance of one item used by result the of \'%s\' LimeSurvey API\'s method is unknown. Proper'
+            . ' class is not mapped in %s::%s() method. Did you forget about this?';
+
+        yield[
+            MethodType::LIST_SURVEYS,
+            sprintf($template, MethodType::LIST_SURVEYS, ResultProcessor::class, 'getItemInstance'),
+        ];
+
+        yield[
+            MethodType::ADD_PARTICIPANTS,
+            sprintf($template, MethodType::ADD_PARTICIPANTS, ResultProcessor::class, 'getItemInstance'),
+        ];
+    }
+}

tests/Meritoo/LimeSurvey/Test/ApiClient/Exception/UnknownMethodExceptionTest.php

@@ -0,0 +1,64 @@
+<?php
+
+/**
+ * (c) Meritoo.pl, http://www.meritoo.pl
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Meritoo\LimeSurvey\Test\ApiClient\Exception;
+
+use Generator;
+use Meritoo\Common\Test\Base\BaseTestCase;
+use Meritoo\Common\Type\OopVisibilityType;
+use Meritoo\LimeSurvey\ApiClient\Exception\UnknownMethodException;
+use Meritoo\LimeSurvey\ApiClient\Type\MethodType;
+
+/**
+ * Test case of an exception used while name of method used while talking to the LimeSurvey's API is unknown
+ *
+ * @author    Krzysztof Niziol <krzysztof.niziol@meritoo.pl>
+ * @copyright Meritoo.pl
+ */
+class UnknownMethodExceptionTest extends BaseTestCase
+{
+    public function testConstructorVisibilityAndArguments()
+    {
+        static::assertConstructorVisibilityAndArguments(UnknownMethodException::class, OopVisibilityType::IS_PUBLIC, 1, 1);
+    }
+
+    /**
+     * @param string $unknownType     The unknown type of something (value of constant)
+     * @param string $expectedMessage Expected exception's message
+     *
+     * @dataProvider provideUnknownType
+     */
+    public function testConstructorMessage($unknownType, $expectedMessage)
+    {
+        $exception = new UnknownMethodException($unknownType);
+        static::assertEquals($expectedMessage, $exception->getMessage());
+    }
+
+    /**
+     * Provides name of called method
+     *
+     * @return Generator
+     */
+    public function provideUnknownType()
+    {
+        $allMethods = implode(', ', (new MethodType())->getAll());
+
+        $template = 'The \'%s\' type of name of method used while talking to the LimeSurvey\'s API is unknown. Probably'
+            . ' doesn\'t exist or there is a typo. You should use one of these types: %s.';
+
+        yield[
+            MethodType::ADD_PARTICIPANTS,
+            sprintf($template, MethodType::ADD_PARTICIPANTS, $allMethods),
+        ];
+
+        yield[
+            MethodType::ADD_PARTICIPANTS,
+            sprintf($template, MethodType::ADD_PARTICIPANTS, $allMethods),
+        ];
+    }
+}

tests/Meritoo/LimeSurvey/Test/ApiClient/Manager/JsonRpcClientManagerTest.php

@@ -9,9 +9,11 @@
 namespace Meritoo\LimeSurvey\Test\ApiClient\Manager;
 
 use JsonRPC\Client as RpcClient;
+use JsonRPC\Exception\InvalidJsonFormatException;
 use Meritoo\Common\Test\Base\BaseTestCase;
 use Meritoo\Common\Type\OopVisibilityType;
 use Meritoo\LimeSurvey\ApiClient\Configuration\ConnectionConfiguration;
+use Meritoo\LimeSurvey\ApiClient\Exception\InvalidResultOfMethodRunException;
 use Meritoo\LimeSurvey\ApiClient\Manager\JsonRpcClientManager;
 use Meritoo\LimeSurvey\ApiClient\Type\MethodType;
 use Meritoo\LimeSurvey\Test\ApiClient\Result\Item\SurveyTest;
@@ -33,10 +35,10 @@ class JsonRpcClientManagerTest extends BaseTestCase
 
     public function testConstructorVisibilityAndArguments()
     {
-        $this->verifyConstructorVisibilityAndArguments(JsonRpcClientManager::class, OopVisibilityType::IS_PUBLIC, 1, 1);
+        static::assertConstructorVisibilityAndArguments(JsonRpcClientManager::class, OopVisibilityType::IS_PUBLIC, 1, 1);
     }
 
-    public function testRunMethod()
+    public function testRunMethodWithEmptyArrayReturned()
     {
         $rpcClient = $this->createMock(RpcClient::class);
 
@@ -51,12 +53,12 @@ class JsonRpcClientManagerTest extends BaseTestCase
             ->getMock();
 
         $rpcClient
-            ->expects(static::any())
+            ->expects(static::once())
             ->method('execute')
             ->willReturn([]);
 
         $manager
-            ->expects(static::any())
+            ->expects(static::once())
             ->method('getRpcClient')
             ->willReturn($rpcClient);
 
@@ -64,18 +66,18 @@ class JsonRpcClientManagerTest extends BaseTestCase
         static::assertEquals([], $manager->runMethod(MethodType::LIST_SURVEYS));
     }
 
-    public function testRunMethodWithMockedRpcClient()
+    public function testRunMethodWithRawDataReturned()
     {
         $rpcClient = $this->createMock(RpcClient::class);
         $manager = $this->createPartialMock(JsonRpcClientManager::class, ['getRpcClient']);
 
         $rpcClient
-            ->expects(static::any())
+            ->expects(static::once())
             ->method('execute')
             ->willReturn(SurveyTest::getSurveysRawData());
 
         $manager
-            ->expects(static::any())
+            ->expects(static::once())
             ->method('getRpcClient')
             ->willReturn($rpcClient);
 
@@ -83,9 +85,30 @@ class JsonRpcClientManagerTest extends BaseTestCase
         static::assertEquals(SurveyTest::getSurveysRawData(), $manager->runMethod(MethodType::LIST_SURVEYS));
     }
 
+    public function testRunMethodWithException()
+    {
+        $this->expectException(InvalidResultOfMethodRunException::class);
+
+        $manager = $this->createPartialMock(JsonRpcClientManager::class, ['getRpcClient']);
+        $rpcClient = $this->createMock(RpcClient::class);
+
+        $rpcClient
+            ->expects(self::once())
+            ->method('execute')
+            ->willThrowException(new InvalidJsonFormatException('bla bla'));
+
+        $manager
+            ->expects(static::once())
+            ->method('getRpcClient')
+            ->willReturn($rpcClient);
+
+        /* @var JsonRpcClientManager $manager */
+        $manager->runMethod(MethodType::LIST_SURVEYS);
+    }
+
     public function testGetRpcClientVisibilityAndArguments()
     {
-        $this->verifyMethodVisibilityAndArguments(JsonRpcClientManager::class, 'getRpcClient', OopVisibilityType::IS_PROTECTED);
+        static::assertMethodVisibilityAndArguments(JsonRpcClientManager::class, 'getRpcClient', OopVisibilityType::IS_PROTECTED);
     }
 
     /**

tests/Meritoo/LimeSurvey/Test/ApiClient/Manager/SessionManagerTest.php

@@ -24,7 +24,7 @@ class SessionManagerTest extends BaseTestCase
 {
     public function testConstructorVisibilityAndArguments()
     {
-        $this->verifyConstructorVisibilityAndArguments(SessionManager::class, OopVisibilityType::IS_PUBLIC, 1, 1);
+        static::assertConstructorVisibilityAndArguments(SessionManager::class, OopVisibilityType::IS_PUBLIC, 1, 1);
     }
 
     public function testGetSessionKeyWhenFailedWithoutReason()

tests/Meritoo/LimeSurvey/Test/ApiClient/Result/Collection/ParticipantsTest.php

@@ -0,0 +1,143 @@
+<?php
+
+/**
+ * (c) Meritoo.pl, http://www.meritoo.pl
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Meritoo\LimeSurvey\Test\ApiClient\Result\Collection;
+
+use Meritoo\Common\Collection\Collection;
+use Meritoo\Common\Exception\Method\DisabledMethodException;
+use Meritoo\Common\Test\Base\BaseTestCase;
+use Meritoo\Common\Type\OopVisibilityType;
+use Meritoo\LimeSurvey\ApiClient\Result\Collection\Participants;
+use Meritoo\LimeSurvey\ApiClient\Result\Item\Participant;
+
+/**
+ * Test case of the participants of survey
+ *
+ * @author    Krzysztof Niziol <krzysztof.niziol@meritoo.pl>
+ * @copyright Meritoo.pl
+ */
+class ParticipantsTest extends BaseTestCase
+{
+    /**
+     * An empty collection of participants
+     *
+     * @var Participants
+     */
+    private $participantsEmpty;
+
+    /**
+     * Participants of 1 survey
+     *
+     * @var Participants
+     */
+    private $participantsOfOneSurvey;
+
+    /**
+     * Participants of more than 1 survey
+     *
+     * @var Participants
+     */
+    private $participantsOfManySurvey;
+
+    public function testConstructorVisibilityAndArguments()
+    {
+        static::assertConstructorVisibilityAndArguments(Participants::class, OopVisibilityType::IS_PUBLIC, 1, 0);
+    }
+
+    public function testAdd()
+    {
+        $this->expectException(DisabledMethodException::class);
+        (new Participants())->add('');
+    }
+
+    public function testAddMultiple()
+    {
+        $this->expectException(DisabledMethodException::class);
+        (new Participants())->addMultiple([]);
+    }
+
+    public function testAddParticipantsWithoutParticipants()
+    {
+        $surveyId = 1;
+
+        $participants = new Participants();
+        $result = $participants->addParticipants(new Collection(), $surveyId);
+
+        static::assertFalse($participants->hasParticipantsOfSurvey($surveyId));
+        static::assertFalse($participants->hasParticipantsOfSurvey(2));
+
+        static::assertEquals($participants, $result);
+        static::assertCount(0, $participants->getBySurvey($surveyId));
+    }
+
+    public function testAddParticipantsFirstParticipants()
+    {
+        $surveyId = 1;
+
+        $participantsData = new Collection([
+            new Participant(),
+            new Participant(),
+        ]);
+
+        $result = $this
+            ->participantsEmpty
+            ->addParticipants($participantsData, $surveyId);
+
+        static::assertTrue($this->participantsEmpty->hasParticipantsOfSurvey($surveyId));
+        static::assertFalse($this->participantsEmpty->hasParticipantsOfSurvey(2));
+
+        static::assertEquals($this->participantsEmpty, $result);
+        static::assertCount(2, $this->participantsEmpty->getBySurvey($surveyId));
+    }
+
+    public function testAddParticipantsMoreParticipants()
+    {
+        $surveyId = 2;
+
+        $participantsData = new Collection([
+            new Participant(),
+            new Participant(),
+        ]);
+
+        $result = $this
+            ->participantsOfOneSurvey
+            ->addParticipants($participantsData, $surveyId);
+
+        static::assertTrue($this->participantsOfOneSurvey->hasParticipantsOfSurvey($surveyId));
+        static::assertFalse($this->participantsOfOneSurvey->hasParticipantsOfSurvey(3));
+
+        static::assertEquals($this->participantsOfOneSurvey, $result);
+        static::assertCount(2, $this->participantsOfOneSurvey->getBySurvey($surveyId));
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function setUp()
+    {
+        parent::setUp();
+
+        $this->participantsEmpty = new Participants();
+        $this->participantsOfOneSurvey = new Participants();
+        $this->participantsOfManySurvey = new Participants();
+
+        $participants1Survey = new Collection();
+        $participants2Survey = new Collection();
+        $participants3Survey = new Collection();
+
+        $this
+            ->participantsOfOneSurvey
+            ->addParticipants($participants1Survey, 1);
+
+        $this
+            ->participantsOfManySurvey
+            ->addParticipants($participants1Survey, 2)
+            ->addParticipants($participants2Survey, 3)
+            ->addParticipants($participants3Survey, 4);
+    }
+}

tests/Meritoo/LimeSurvey/Test/ApiClient/Result/Item/ParticipantShortTest.php

@@ -8,10 +8,10 @@
 
 namespace Meritoo\LimeSurvey\Test\ApiClient\Result\Item;
 
+use Meritoo\Common\Test\Base\BaseTestCase;
 use Meritoo\LimeSurvey\ApiClient\Result\Item\ParticipantShort;
 use Meritoo\LimeSurvey\ApiClient\Result\Processor\ResultProcessor;
 use Meritoo\LimeSurvey\ApiClient\Type\MethodType;
-use PHPUnit_Framework_TestCase;
 
 /**
  * Test case of the one item of the result/data: short data of participant
@@ -19,7 +19,7 @@ use PHPUnit_Framework_TestCase;
  * @author    Krzysztof Niziol <krzysztof.niziol@meritoo.pl>
  * @copyright Meritoo.pl
  */
-class ParticipantShortTest extends PHPUnit_Framework_TestCase
+class ParticipantShortTest extends BaseTestCase
 {
     /**
      * Raw data of participants
@@ -42,6 +42,11 @@ class ParticipantShortTest extends PHPUnit_Framework_TestCase
      */
     private $participant2ndInstance;
 
+    public function testConstructorVisibilityAndArguments()
+    {
+        static::assertHasNoConstructor(ParticipantShort::class);
+    }
+
     public function testCreateOfTheParticipant()
     {
         $processor = new ResultProcessor();

tests/Meritoo/LimeSurvey/Test/ApiClient/Result/Item/ParticipantTest.php

@@ -9,10 +9,10 @@
 namespace Meritoo\LimeSurvey\Test\ApiClient\Result\Item;
 
 use DateTime;
+use Meritoo\Common\Test\Base\BaseTestCase;
 use Meritoo\LimeSurvey\ApiClient\Result\Item\Participant;
 use Meritoo\LimeSurvey\ApiClient\Result\Processor\ResultProcessor;
 use Meritoo\LimeSurvey\ApiClient\Type\MethodType;
-use PHPUnit_Framework_TestCase;
 
 /**
  * Test case of the one item of the result/data: full data of participant
@@ -20,7 +20,7 @@ use PHPUnit_Framework_TestCase;
  * @author    Krzysztof Niziol <krzysztof.niziol@meritoo.pl>
  * @copyright Meritoo.pl
  */
-class ParticipantTest extends PHPUnit_Framework_TestCase
+class ParticipantTest extends BaseTestCase
 {
     /**
      * Raw data of participants
@@ -43,6 +43,11 @@ class ParticipantTest extends PHPUnit_Framework_TestCase
      */
     private $participant2ndInstance;
 
+    public function testConstructorVisibilityAndArguments()
+    {
+        static::assertHasNoConstructor(Participant::class);
+    }
+
     public function testCreateOfTheParticipant()
     {
         $processor = new ResultProcessor();

tests/Meritoo/LimeSurvey/Test/ApiClient/Result/Item/QuestionShortTest.php

@@ -42,6 +42,11 @@ class QuestionShortTest extends BaseTestCase
      */
     private $question2ndInstance;
 
+    public function testConstructorVisibilityAndArguments()
+    {
+        static::assertHasNoConstructor(QuestionShort::class);
+    }
+
     public function testCreateOfTheQuestionShort()
     {
         $processor = new ResultProcessor();

tests/Meritoo/LimeSurvey/Test/ApiClient/Result/Item/QuestionTest.php

@@ -8,10 +8,10 @@
 
 namespace Meritoo\LimeSurvey\Test\ApiClient\Result\Item;
 
+use Meritoo\Common\Test\Base\BaseTestCase;
 use Meritoo\LimeSurvey\ApiClient\Result\Item\Question;
 use Meritoo\LimeSurvey\ApiClient\Result\Processor\ResultProcessor;
 use Meritoo\LimeSurvey\ApiClient\Type\MethodType;
-use PHPUnit_Framework_TestCase;
 
 /**
  * Test case of the one item of the result/data: full data of one question of survey
@@ -19,7 +19,7 @@ use PHPUnit_Framework_TestCase;
  * @author    Krzysztof Niziol <krzysztof.niziol@meritoo.pl>
  * @copyright Meritoo.pl
  */
-class QuestionTest extends PHPUnit_Framework_TestCase
+class QuestionTest extends BaseTestCase
 {
     /**
      * Raw data of questions
@@ -42,6 +42,11 @@ class QuestionTest extends PHPUnit_Framework_TestCase
      */
     private $question2ndInstance;
 
+    public function testConstructorVisibilityAndArguments()
+    {
+        static::assertHasNoConstructor(Question::class);
+    }
+
     public function testCreateOfTheQuestionShort()
     {
         $processor = new ResultProcessor();

tests/Meritoo/LimeSurvey/Test/ApiClient/Result/Item/SurveyTest.php

@@ -9,10 +9,10 @@
 namespace Meritoo\LimeSurvey\Test\ApiClient\Result\Item;
 
 use DateTime;
+use Meritoo\Common\Test\Base\BaseTestCase;
 use Meritoo\LimeSurvey\ApiClient\Result\Item\Survey;
 use Meritoo\LimeSurvey\ApiClient\Result\Processor\ResultProcessor;
 use Meritoo\LimeSurvey\ApiClient\Type\MethodType;
-use PHPUnit_Framework_TestCase;
 
 /**
  * Test case of the one item of the result/data: survey
@@ -20,7 +20,7 @@ use PHPUnit_Framework_TestCase;
  * @author    Krzysztof Niziol <krzysztof.niziol@meritoo.pl>
  * @copyright Meritoo.pl
  */
-class SurveyTest extends PHPUnit_Framework_TestCase
+class SurveyTest extends BaseTestCase
 {
     /**
      * Raw data of surveys
@@ -43,6 +43,11 @@ class SurveyTest extends PHPUnit_Framework_TestCase
      */
     private $survey2ndInstance;
 
+    public function testConstructorVisibilityAndArguments()
+    {
+        static::assertHasNoConstructor(Survey::class);
+    }
+
     public function testCreateOfTheSurvey()
     {
         $processor = new ResultProcessor();

tests/Meritoo/LimeSurvey/Test/ApiClient/Result/Processor/ResultProcessorTest.php

@@ -12,10 +12,10 @@ use Meritoo\Common\Test\Base\BaseTestCase;
 use Meritoo\Common\Type\OopVisibilityType;
 use Meritoo\LimeSurvey\ApiClient\Base\Result\BaseItem;
 use Meritoo\LimeSurvey\ApiClient\Exception\UnknownInstanceOfResultItem;
+use Meritoo\LimeSurvey\ApiClient\Result\Item\Survey;
 use Meritoo\LimeSurvey\ApiClient\Result\Processor\ResultProcessor;
 use Meritoo\LimeSurvey\ApiClient\Type\MethodType;
 use Meritoo\LimeSurvey\Test\ApiClient\Result\Item\SurveyTest;
-use ReflectionClass;
 
 /**
  * Test case of the processor of the raw data fetched while talking to the LimeSurvey's API
@@ -27,10 +27,7 @@ class ResultProcessorTest extends BaseTestCase
 {
     public function testConstructorVisibilityAndArguments()
     {
-        $reflection = new ReflectionClass(ResultProcessor::class);
+        static::assertHasNoConstructor(ResultProcessor::class);
-        $constructor = $reflection->getConstructor();
-
-        static::assertNull($constructor);
     }
 
     public function testProcessWithEmptyRawData()
@@ -43,12 +40,24 @@ class ResultProcessorTest extends BaseTestCase
 
     public function testProcessWithIterableData()
     {
+        $surveysRawData = SurveyTest::getSurveysRawData();
         $processor = new ResultProcessor();
-        $processed = $processor->process(MethodType::LIST_SURVEYS, SurveyTest::getSurveysRawData());
+        $processed = $processor->process(MethodType::LIST_SURVEYS, $surveysRawData);
 
-        static::assertNotEmpty($processed);
         static::assertTrue(is_array($processed));
         static::assertCount(2, $processed);
+
+        /* @var Survey $firstSurvey */
+        $firstSurvey = $processed[0];
+
+        /* @var Survey $secondSurvey */
+        $secondSurvey = $processed[1];
+
+        static::assertEquals($surveysRawData[0]['sid'], $firstSurvey->getId());
+        static::assertEquals($surveysRawData[1]['sid'], $secondSurvey->getId());
+
+        static::assertEquals($surveysRawData[0]['surveyls_title'], $firstSurvey->getTitle());
+        static::assertEquals($surveysRawData[1]['surveyls_title'], $secondSurvey->getTitle());
     }
 
     public function testProcessWithNotIterableData()
@@ -68,7 +77,7 @@ class ResultProcessorTest extends BaseTestCase
 
     public function testGetItemInstanceVisibilityAndArguments()
     {
-        $this->verifyMethodVisibilityAndArguments(ResultProcessor::class, 'getItemInstance', OopVisibilityType::IS_PRIVATE, 1, 1);
+        static::assertMethodVisibilityAndArguments(ResultProcessor::class, 'getItemInstance', OopVisibilityType::IS_PRIVATE, 1, 1);
     }
 
     public function testRunWithUnknownResultClass()

tests/Meritoo/LimeSurvey/Test/ApiClient/Result/ResultTest.php

@@ -12,6 +12,7 @@ use DateTime;
 use Meritoo\Common\Test\Base\BaseTestCase;
 use Meritoo\Common\Type\OopVisibilityType;
 use Meritoo\LimeSurvey\ApiClient\Base\Result\BaseItem;
+use Meritoo\LimeSurvey\ApiClient\Exception\CannotProcessDataException;
 use Meritoo\LimeSurvey\ApiClient\Result\Result;
 use Meritoo\LimeSurvey\ApiClient\Type\MethodType;
 use PHPUnit_Framework_MockObject_MockObject;
@@ -46,45 +47,60 @@ class ResultTest extends BaseTestCase
     private $notIterableData;
 
     /**
-     * Mock of the tested class.
+     * Status provided instead of real data.
-     * With empty data returned by the LimeSurvey's API.
+     * An array with one key: "status".
      *
-     * @var PHPUnit_Framework_MockObject_MockObject
+     * @var array
      */
-    private $emptyDataMock;
+    private $statusInsteadData;
 
     /**
+     * Result with empty data returned by the LimeSurvey's API.
      * Mock of the tested class.
-     * With iterable, not empty data.
      *
      * @var PHPUnit_Framework_MockObject_MockObject
      */
-    private $iterableDataMock;
+    private $emptyDataResult;
 
     /**
+     * Result with iterable, not empty data.
      * Mock of the tested class.
-     * With not iterable, not empty data.
      *
      * @var PHPUnit_Framework_MockObject_MockObject
      */
-    private $notIterableDataMock;
+    private $iterableDataResult;
+
+    /**
+     * Result with not iterable, not empty data.
+     * Mock of the tested class.
+     *
+     * @var PHPUnit_Framework_MockObject_MockObject
+     */
+    private $notIterableDataResult;
+
+    /**
+     * Result with status provided instead of real data
+     *
+     * @var Result
+     */
+    private $statusInsteadDataResult;
 
     public function testConstructorVisibilityAndArguments()
     {
-        $this->verifyConstructorVisibilityAndArguments(Result::class, OopVisibilityType::IS_PUBLIC, 2, 2);
+        static::assertConstructorVisibilityAndArguments(Result::class, OopVisibilityType::IS_PUBLIC, 2, 2);
     }
 
     public function testIsEmpty()
     {
-        static::assertTrue($this->emptyDataMock->isEmpty());
+        static::assertTrue($this->emptyDataResult->isEmpty());
-        static::assertFalse($this->iterableDataMock->isEmpty());
+        static::assertFalse($this->iterableDataResult->isEmpty());
     }
 
     public function testGetDataUsingProcessedData()
     {
-        $emptyData = $this->emptyDataMock->getData();
+        $emptyData = $this->emptyDataResult->getData();
-        $iterableData = $this->iterableDataMock->getData();
+        $iterableData = $this->iterableDataResult->getData();
-        $notIterableData = $this->notIterableDataMock->getData();
+        $notIterableData = $this->notIterableDataResult->getData();
 
         static::assertEmpty($emptyData);
         static::assertNotEmpty($iterableData);
@@ -97,8 +113,8 @@ class ResultTest extends BaseTestCase
 
     public function testGetDataUsingRawData()
     {
-        $emptyData = $this->emptyDataMock->getData(true);
+        $emptyData = $this->emptyDataResult->getData(true);
-        $iterableData = $this->iterableDataMock->getData(true);
+        $iterableData = $this->iterableDataResult->getData(true);
 
         static::assertEmpty($emptyData);
         static::assertNotEmpty($iterableData);
@@ -110,14 +126,34 @@ class ResultTest extends BaseTestCase
         static::assertEquals($this->iterableData, $iterableData);
     }
 
+    public function testGetDataUsingProcessedDataWhoCannotBeProcessed()
+    {
+        $this->expectException(CannotProcessDataException::class);
+        $this->statusInsteadDataResult->getData();
+    }
+
     public function testGetProcessedDataVisibilityAndArguments()
     {
-        $this->verifyMethodVisibilityAndArguments(Result::class, 'getProcessedData', OopVisibilityType::IS_PRIVATE, 1, 1);
+        static::assertMethodVisibilityAndArguments(Result::class, 'getProcessedData', OopVisibilityType::IS_PRIVATE, 1, 1);
     }
 
     public function testGetResultProcessorVisibilityAndArguments()
     {
-        $this->verifyMethodVisibilityAndArguments(Result::class, 'getResultProcessor', OopVisibilityType::IS_PRIVATE);
+        static::assertMethodVisibilityAndArguments(Result::class, 'getResultProcessor', OopVisibilityType::IS_PRIVATE);
+    }
+
+    public function testGetStatusWhenIsNotProvided()
+    {
+        $result = new Result(MethodType::ADD_PARTICIPANTS, []);
+
+        static::assertEquals(null, $result->getStatus());
+        static::assertEquals([], $result->getData(true));
+    }
+
+    public function testGetStatusWhenIsProvided()
+    {
+        static::assertEquals($this->statusInsteadData['status'], $this->statusInsteadDataResult->getStatus());
+        static::assertEquals([], $this->statusInsteadDataResult->getData(true));
     }
 
     /**
@@ -149,24 +185,29 @@ class ResultTest extends BaseTestCase
             ],
         ];
 
-        $emptyDataArguments = [
+        $this->statusInsteadData = [
+            'status' => 'Invalid data',
+        ];
+
+        $emptyData = [
             MethodType::LIST_SURVEYS,
             $this->emptyData,
         ];
 
-        $iterableDataArguments = [
+        $iterableData = [
             MethodType::LIST_SURVEYS,
             $this->iterableData,
         ];
 
-        $notIterableDataArguments = [
+        $notIterableData = [
             MethodType::GET_PARTICIPANT_PROPERTIES,
             $this->notIterableData,
         ];
 
-        $this->emptyDataMock = $this->getResultMock($emptyDataArguments);
+        $this->emptyDataResult = $this->getResultMock($emptyData);
-        $this->iterableDataMock = $this->getResultMock($iterableDataArguments);
+        $this->iterableDataResult = $this->getResultMock($iterableData);
-        $this->notIterableDataMock = $this->getResultMock($notIterableDataArguments);
+        $this->notIterableDataResult = $this->getResultMock($notIterableData);
+        $this->statusInsteadDataResult = new Result(MethodType::LIST_PARTICIPANTS, $this->statusInsteadData);
     }
 
     /**

tests/Meritoo/LimeSurvey/Test/ApiClient/Service/ParticipantServiceTest.php

@@ -0,0 +1,186 @@
+<?php
+
+/**
+ * (c) Meritoo.pl, http://www.meritoo.pl
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Meritoo\LimeSurvey\Test\ApiClient\Service;
+
+use Meritoo\Common\Collection\Collection;
+use Meritoo\Common\Test\Base\BaseTestCase;
+use Meritoo\Common\Type\OopVisibilityType;
+use Meritoo\LimeSurvey\ApiClient\Client\Client;
+use Meritoo\LimeSurvey\ApiClient\Configuration\ConnectionConfiguration;
+use Meritoo\LimeSurvey\ApiClient\Manager\JsonRpcClientManager;
+use Meritoo\LimeSurvey\ApiClient\Manager\SessionManager;
+use Meritoo\LimeSurvey\ApiClient\Result\Collection\Participants;
+use Meritoo\LimeSurvey\ApiClient\Result\Item\Participant;
+use Meritoo\LimeSurvey\ApiClient\Service\ParticipantService;
+use PHPUnit_Framework_MockObject_MockObject;
+
+/**
+ * Test case of the service that serves participants
+ *
+ * @author    Krzysztof Niziol <krzysztof.niziol@meritoo.pl>
+ * @copyright Meritoo.pl
+ */
+class ParticipantServiceTest extends BaseTestCase
+{
+    /**
+     * Serves participants.
+     * Service without participants.
+     *
+     * @var ParticipantService
+     */
+    private $serviceWithoutParticipants;
+
+    /**
+     * Serves participants.
+     * Service with participants.
+     *
+     * @var ParticipantService
+     */
+    private $serviceWithParticipants;
+
+    public function testConstructorVisibilityAndArguments()
+    {
+        static::assertConstructorVisibilityAndArguments(ParticipantService::class, OopVisibilityType::IS_PUBLIC, 2, 1);
+    }
+
+    public function testGetSurveyParticipantsFromEmptyParticipants()
+    {
+        $rpcClientManager = $this->getJsonRpcClientManager(3);
+        $sessionManager = $this->getSessionManager();
+
+        $this->createServiceWithoutParticipants($rpcClientManager, $sessionManager);
+        $this->createServiceWithParticipants($rpcClientManager, $sessionManager);
+
+        static::assertCount(0, $this->serviceWithoutParticipants->getSurveyParticipants(1));
+        static::assertCount(0, $this->serviceWithoutParticipants->getSurveyParticipants(2));
+
+        static::assertCount(2, $this->serviceWithParticipants->getSurveyParticipants(1));
+        static::assertCount(1, $this->serviceWithParticipants->getSurveyParticipants(2));
+        static::assertCount(0, $this->serviceWithParticipants->getSurveyParticipants(3));
+    }
+
+    public function testHasParticipant()
+    {
+        $rpcClientManager = $this->getJsonRpcClientManager(3);
+        $sessionManager = $this->getSessionManager();
+
+        $this->createServiceWithoutParticipants($rpcClientManager, $sessionManager);
+        $this->createServiceWithParticipants($rpcClientManager, $sessionManager);
+
+        static::assertFalse($this->serviceWithoutParticipants->hasParticipant(1, 'john@scott.com'));
+        static::assertFalse($this->serviceWithoutParticipants->hasParticipant(2, 'john@scott.com'));
+
+        static::assertTrue($this->serviceWithParticipants->hasParticipant(1, 'john@scott.com'));
+        static::assertFalse($this->serviceWithParticipants->hasParticipant(2, 'john@scott.com'));
+        static::assertFalse($this->serviceWithParticipants->hasParticipant(3, 'john@scott.com'));
+    }
+
+    public function testAddParticipant()
+    {
+        $firstName = 'John';
+        $lastName = 'Scott';
+        $email = 'john@scott.com';
+        $runMethodCallCount = 1;
+
+        $runMethodCallResults = [
+            [
+                'firstname' => $firstName,
+                'lastname'  => $lastName,
+                'email'     => $email,
+            ],
+        ];
+
+        $rpcClientManager = $this->getJsonRpcClientManager($runMethodCallCount, $runMethodCallResults);
+        $sessionManager = $this->getSessionManager();
+        $this->createServiceWithoutParticipants($rpcClientManager, $sessionManager);
+
+        $result = $this->serviceWithoutParticipants->addParticipant(1, $firstName, $lastName, $email);
+        static::assertInstanceOf(Participant::class, $result);
+    }
+
+    /**
+     * Returns configuration used while connecting to LimeSurvey's API
+     *
+     * @return ConnectionConfiguration
+     */
+    private function getConnectionConfiguration()
+    {
+        return new ConnectionConfiguration('http://test.com', 'test', 'test');
+    }
+
+    /**
+     * Returns manager of session started while connecting to LimeSurvey's API
+     *
+     * @return PHPUnit_Framework_MockObject_MockObject
+     */
+    private function getSessionManager()
+    {
+        return $this->createMock(SessionManager::class);
+    }
+
+    /**
+     * Returns manager of the JsonRPC client used while connecting to LimeSurvey's API
+     *
+     * @param int   $runMethodCallCount   Count of calls of the runMethod() method (who is mocked)
+     * @param array $runMethodCallResults (optional) Results of calls of the runMethod() method (who is mocked)
+     * @return PHPUnit_Framework_MockObject_MockObject
+     */
+    private function getJsonRpcClientManager($runMethodCallCount, array $runMethodCallResults = [])
+    {
+        $rpcClientManager = $this->createMock(JsonRpcClientManager::class);
+
+        $rpcClientManager
+            ->expects(static::exactly($runMethodCallCount))
+            ->method('runMethod')
+            ->will(static::returnValue($runMethodCallResults));
+
+        return $rpcClientManager;
+    }
+
+    /**
+     * Creates instance of the tested service without participants
+     *
+     * @param PHPUnit_Framework_MockObject_MockObject $rpcClientManager Manager of the JsonRPC client used while connecting to LimeSurvey's API
+     * @param PHPUnit_Framework_MockObject_MockObject $sessionManager   Manager of session started while connecting to LimeSurvey's API
+     */
+    private function createServiceWithoutParticipants(PHPUnit_Framework_MockObject_MockObject $rpcClientManager, PHPUnit_Framework_MockObject_MockObject $sessionManager)
+    {
+        $configuration = $this->getConnectionConfiguration();
+        $client = new Client($configuration, $rpcClientManager, $sessionManager);
+        $this->serviceWithoutParticipants = new ParticipantService($client);
+    }
+
+    /**
+     * Creates instance of the tested service with participants
+     *
+     * @param PHPUnit_Framework_MockObject_MockObject $rpcClientManager Manager of the JsonRPC client used while connecting to LimeSurvey's API
+     * @param PHPUnit_Framework_MockObject_MockObject $sessionManager   Manager of session started while connecting to LimeSurvey's API
+     */
+    private function createServiceWithParticipants(PHPUnit_Framework_MockObject_MockObject $rpcClientManager, PHPUnit_Framework_MockObject_MockObject $sessionManager)
+    {
+        $configuration = $this->getConnectionConfiguration();
+        $client = new Client($configuration, $rpcClientManager, $sessionManager);
+
+        $allParticipants = new Participants([
+            1 => new Collection([
+                (new Participant())->setValues([
+                    'firstname' => 'John',
+                    'lastname'  => 'Scott',
+                    'email'     => 'john@scott.com',
+                ]),
+                new Participant(),
+            ]),
+            2 => new Collection([
+                new Participant(),
+            ]),
+        ]);
+
+        $this->serviceWithParticipants = new ParticipantService($client, $allParticipants);
+    }
+}

tests/Meritoo/LimeSurvey/Test/ApiClient/Service/SurveyServiceTest.php

@@ -0,0 +1,155 @@
+<?php
+
+/**
+ * (c) Meritoo.pl, http://www.meritoo.pl
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Meritoo\LimeSurvey\Test\ApiClient\Service;
+
+use Meritoo\Common\Collection\Collection;
+use Meritoo\Common\Test\Base\BaseTestCase;
+use Meritoo\Common\Type\OopVisibilityType;
+use Meritoo\LimeSurvey\ApiClient\Client\Client;
+use Meritoo\LimeSurvey\ApiClient\Configuration\ConnectionConfiguration;
+use Meritoo\LimeSurvey\ApiClient\Manager\JsonRpcClientManager;
+use Meritoo\LimeSurvey\ApiClient\Manager\SessionManager;
+use Meritoo\LimeSurvey\ApiClient\Result\Item\Survey;
+use Meritoo\LimeSurvey\ApiClient\Service\SurveyService;
+use PHPUnit_Framework_MockObject_MockObject;
+
+/**
+ * Test case of the service that serves surveys
+ *
+ * @author    Krzysztof Niziol <krzysztof.niziol@meritoo.pl>
+ * @copyright Meritoo.pl
+ */
+class SurveyServiceTest extends BaseTestCase
+{
+    /**
+     * Serves surveys.
+     * Service without surveys.
+     *
+     * @var SurveyService
+     */
+    private $serviceWithoutSurveys;
+
+    /**
+     * Serves surveys.
+     * Service with surveys.
+     *
+     * @var SurveyService
+     */
+    private $serviceWithSurveys;
+
+    public function testConstructorVisibilityAndArguments()
+    {
+        static::assertConstructorVisibilityAndArguments(SurveyService::class, OopVisibilityType::IS_PUBLIC, 2, 1);
+    }
+
+    public function testGetAllSurveys()
+    {
+        $rpcClientManager = $this->getJsonRpcClientManager(1);
+        $sessionManager = $this->getSessionManager();
+
+        $this->createServiceWithoutSurveys($rpcClientManager, $sessionManager);
+        $this->createServiceWithSurveys($rpcClientManager, $sessionManager);
+
+        static::assertCount(0, $this->serviceWithoutSurveys->getAllSurveys());
+        static::assertCount(2, $this->serviceWithSurveys->getAllSurveys());
+    }
+
+    public function testIsExistingSurvey()
+    {
+        $rpcClientManager = $this->getJsonRpcClientManager(2);
+        $sessionManager = $this->getSessionManager();
+
+        $this->createServiceWithoutSurveys($rpcClientManager, $sessionManager);
+        $this->createServiceWithSurveys($rpcClientManager, $sessionManager);
+
+        static::assertFalse($this->serviceWithoutSurveys->isExistingSurvey(1));
+        static::assertFalse($this->serviceWithoutSurveys->isExistingSurvey(2));
+
+        static::assertTrue($this->serviceWithSurveys->isExistingSurvey(1));
+        static::assertTrue($this->serviceWithSurveys->isExistingSurvey(2));
+        static::assertFalse($this->serviceWithSurveys->isExistingSurvey(3));
+    }
+
+    /**
+     * Returns configuration used while connecting to LimeSurvey's API
+     *
+     * @return ConnectionConfiguration
+     */
+    private function getConnectionConfiguration()
+    {
+        return new ConnectionConfiguration('http://test.com', 'test', 'test');
+    }
+
+    /**
+     * Returns manager of session started while connecting to LimeSurvey's API
+     *
+     * @return PHPUnit_Framework_MockObject_MockObject
+     */
+    private function getSessionManager()
+    {
+        return $this->createMock(SessionManager::class);
+    }
+
+    /**
+     * Returns manager of the JsonRPC client used while connecting to LimeSurvey's API
+     *
+     * @param int   $runMethodCallCount   Count of calls of the runMethod() method (who is mocked)
+     * @param array $runMethodCallResults (optional) Results of calls of the runMethod() method (who is mocked)
+     * @return PHPUnit_Framework_MockObject_MockObject
+     */
+    private function getJsonRpcClientManager($runMethodCallCount, array $runMethodCallResults = [])
+    {
+        $rpcClientManager = $this->createMock(JsonRpcClientManager::class);
+
+        $rpcClientManager
+            ->expects(static::exactly($runMethodCallCount))
+            ->method('runMethod')
+            ->will(static::returnValue($runMethodCallResults));
+
+        return $rpcClientManager;
+    }
+
+    /**
+     * Creates instance of the tested service without surveys
+     *
+     * @param PHPUnit_Framework_MockObject_MockObject $rpcClientManager Manager of the JsonRPC client used while connecting to LimeSurvey's API
+     * @param PHPUnit_Framework_MockObject_MockObject $sessionManager   Manager of session started while connecting to LimeSurvey's API
+     */
+    private function createServiceWithoutSurveys(PHPUnit_Framework_MockObject_MockObject $rpcClientManager, PHPUnit_Framework_MockObject_MockObject $sessionManager)
+    {
+        $configuration = $this->getConnectionConfiguration();
+        $client = new Client($configuration, $rpcClientManager, $sessionManager);
+        $this->serviceWithoutSurveys = new SurveyService($client);
+    }
+
+    /**
+     * Creates instance of the tested service with surveys
+     *
+     * @param PHPUnit_Framework_MockObject_MockObject $rpcClientManager Manager of the JsonRPC client used while connecting to LimeSurvey's API
+     * @param PHPUnit_Framework_MockObject_MockObject $sessionManager   Manager of session started while connecting to LimeSurvey's API
+     */
+    private function createServiceWithSurveys(PHPUnit_Framework_MockObject_MockObject $rpcClientManager, PHPUnit_Framework_MockObject_MockObject $sessionManager)
+    {
+        $configuration = $this->getConnectionConfiguration();
+        $client = new Client($configuration, $rpcClientManager, $sessionManager);
+
+        $allSurveys = new Collection([
+            (new Survey())->setValues([
+                'sid'            => 1,
+                'surveyls_title' => 'Test',
+            ]),
+            (new Survey())->setValues([
+                'sid'            => 2,
+                'surveyls_title' => 'Another Test',
+            ]),
+        ]);
+
+        $this->serviceWithSurveys = new SurveyService($client, $allSurveys);
+    }
+}

tests/Meritoo/LimeSurvey/Test/ApiClient/Type/MethodTypeTest.php

@@ -12,6 +12,7 @@ use Generator;
 use Meritoo\Common\Test\Base\BaseTypeTestCase;
 use Meritoo\LimeSurvey\ApiClient\Exception\UnknownMethodException;
 use Meritoo\LimeSurvey\ApiClient\Type\MethodType;
+use Meritoo\LimeSurvey\ApiClient\Type\SystemMethodType;
 
 /**
  * Test case of the type of method used while talking with LimeSurvey's API
@@ -21,6 +22,11 @@ use Meritoo\LimeSurvey\ApiClient\Type\MethodType;
  */
 class MethodTypeTest extends BaseTypeTestCase
 {
+    public function testConstructorVisibilityAndArguments()
+    {
+        static::assertHasNoConstructor(MethodType::class);
+    }
+
     /**
      * @param string $incorrectMethod Type of method to verify
      * @dataProvider provideIncorrectMethod
@@ -83,6 +89,14 @@ class MethodTypeTest extends BaseTypeTestCase
         yield[
             MethodType::LIST_SURVEYS,
         ];
+
+        yield[
+            SystemMethodType::GET_SESSION_KEY,
+        ];
+
+        yield[
+            SystemMethodType::RELEASE_SESSION_KEY,
+        ];
     }
 
     /**
@@ -157,6 +171,7 @@ class MethodTypeTest extends BaseTypeTestCase
     protected function getAllExpectedTypes()
     {
         return [
+            'ADD_PARTICIPANTS'           => MethodType::ADD_PARTICIPANTS,
             'ADD_RESPONSE'               => MethodType::ADD_RESPONSE,
             'EXPORT_STATISTICS'          => MethodType::EXPORT_STATISTICS,
             'GET_PARTICIPANT_PROPERTIES' => MethodType::GET_PARTICIPANT_PROPERTIES,

tests/Meritoo/LimeSurvey/Test/ApiClient/Type/SystemMethodTypeTest.php

@@ -19,6 +19,11 @@ use Meritoo\LimeSurvey\ApiClient\Type\SystemMethodType;
  */
 class SystemMethodTypeTest extends BaseTypeTestCase
 {
+    public function testConstructorVisibilityAndArguments()
+    {
+        static::assertHasNoConstructor(SystemMethodType::class);
+    }
+
     /**
      * {@inheritdoc}
      */