Tests - increase code coverage

composer.json

@@ -2,7 +2,7 @@
     "name": "meritoo/common-library",
     "description": "Useful classes, methods, extensions etc.",
     "license": "MIT",
-    "version": "0.0.16",
+    "version": "0.0.18",
     "authors": [
         {
             "name": "Meritoo.pl",

src/Test/Base/BaseTestCase.php

@@ -8,14 +8,8 @@
 
 namespace Meritoo\Common\Test\Base;
 
-use DateTime;
-use Generator;
-use Meritoo\Common\Exception\Type\UnknownOopVisibilityTypeException;
-use Meritoo\Common\Type\OopVisibilityType;
-use Meritoo\Common\Utilities\Miscellaneous;
+use Meritoo\Common\Traits\Test\Base\BaseTestCaseTrait;
 use PHPUnit\Framework\TestCase;
-use ReflectionClass;
-use ReflectionMethod;
 
 /**
  * Base test case with common methods and data providers
@@ -25,214 +19,5 @@ use ReflectionMethod;
  */
 abstract class BaseTestCase extends TestCase
 {
-    /**
-     * Path of directory with data used by test cases
-     *
-     * @var string
-     */
-    private static $testsDataDirPath = '.data/tests';
-
-    /**
-     * Provides an empty value
-     *
-     * @return Generator
-     */
-    public function provideEmptyValue()
-    {
-        yield[''];
-        yield['   '];
-        yield[null];
-        yield[0];
-        yield[false];
-        yield[[]];
-    }
-
-    /**
-     * Provides boolean value
-     *
-     * @return Generator
-     */
-    public function provideBooleanValue()
-    {
-        yield[false];
-        yield[true];
-    }
-
-    /**
-     * Provides instance of DateTime class
-     *
-     * @return Generator
-     */
-    public function provideDateTimeInstance()
-    {
-        yield[new DateTime()];
-        yield[new DateTime('yesterday')];
-        yield[new DateTime('now')];
-        yield[new DateTime('tomorrow')];
-    }
-
-    /**
-     * Provides relative / compound format of DateTime
-     *
-     * @return Generator
-     */
-    public function provideDateTimeRelativeFormat()
-    {
-        yield['now'];
-        yield['yesterday'];
-        yield['tomorrow'];
-        yield['back of 10'];
-        yield['front of 10'];
-        yield['last day of February'];
-        yield['first day of next month'];
-        yield['last day of previous month'];
-        yield['last day of next month'];
-        yield['Y-m-d'];
-        yield['Y-m-d 10:00'];
-    }
-
-    /**
-     * Provides path of not existing file, e.g. "lorem/ipsum.jpg"
-     *
-     * @return Generator
-     */
-    public function provideNotExistingFilePath()
-    {
-        yield['lets-test.doc'];
-        yield['lorem/ipsum.jpg'];
-        yield['surprise/me/one/more/time.txt'];
-    }
-
-    /**
-     * Returns path of file used by tests.
-     * It should be placed in /.data/tests directory of this project.
-     *
-     * @param string $fileName      Name of file
-     * @param string $directoryPath (optional) Path of directory containing the file
-     * @return string
-     */
-    public function getFilePathForTesting($fileName, $directoryPath = '')
-    {
-        $rootPath = Miscellaneous::getProjectRootPath();
-
-        $paths = [
-            $rootPath,
-            self::$testsDataDirPath,
-            $directoryPath,
-            $fileName,
-        ];
-
-        return Miscellaneous::concatenatePaths($paths);
-    }
-
-    /**
-     * Verifies visibility and arguments of method
-     *
-     * @param string                  $classNamespace         Namespace of class that contains method to verify
-     * @param string|ReflectionMethod $method                 Name of method or just the method to verify
-     * @param string                  $visibilityType         Expected visibility of verified method. One of
-     *                                                        OopVisibilityType class constants.
-     * @param int                     $argumentsCount         (optional) Expected count/amount of arguments of the
-     *                                                        verified method
-     * @param int                     $requiredArgumentsCount (optional) Expected count/amount of required arguments
-     *                                                        of the verified method
-     * @throws UnknownOopVisibilityTypeException
-     *
-     * Attention. 2nd argument, the $method, may be:
-     * - string - name of the method
-     * - instance of ReflectionMethod - just the method (provided by ReflectionClass::getMethod() method)
-     */
-    protected static function assertMethodVisibilityAndArguments(
-        $classNamespace,
-        $method,
-        $visibilityType,
-        $argumentsCount = 0,
-        $requiredArgumentsCount = 0
-    ) {
-        /*
-         * Type of visibility is correct?
-         */
-        if (!(new OopVisibilityType())->isCorrectType($visibilityType)) {
-            throw new UnknownOopVisibilityTypeException($visibilityType);
-        }
-
-        $reflection = new ReflectionClass($classNamespace);
-
-        /*
-         * Name of method provided only?
-         * Let's find instance of the method (based on reflection)
-         */
-        if (!$method instanceof ReflectionMethod) {
-            $method = $reflection->getMethod($method);
-        }
-
-        switch ($visibilityType) {
-            case OopVisibilityType::IS_PUBLIC:
-                static::assertTrue($method->isPublic());
-                break;
-
-            case OopVisibilityType::IS_PROTECTED:
-                static::assertTrue($method->isProtected());
-                break;
-
-            case OopVisibilityType::IS_PRIVATE:
-                static::assertTrue($method->isPrivate());
-                break;
-        }
-
-        static::assertEquals($argumentsCount, $method->getNumberOfParameters());
-        static::assertEquals($requiredArgumentsCount, $method->getNumberOfRequiredParameters());
-    }
-
-    /**
-     * Verifies visibility and arguments of class constructor
-     *
-     * @param string $classNamespace         Namespace of class that contains constructor to verify
-     * @param string $visibilityType         Expected visibility of verified method. One of OopVisibilityType class
-     *                                       constants.
-     * @param int    $argumentsCount         (optional) Expected count/amount of arguments of the verified method
-     * @param int    $requiredArgumentsCount (optional) Expected count/amount of required arguments of the verified
-     *                                       method
-     * @throws UnknownOopVisibilityTypeException
-     */
-    protected static function assertConstructorVisibilityAndArguments(
-        $classNamespace,
-        $visibilityType,
-        $argumentsCount = 0,
-        $requiredArgumentsCount = 0
-    ) {
-        /*
-         * Let's grab the constructor
-         */
-        $reflection = new ReflectionClass($classNamespace);
-        $method = $reflection->getConstructor();
-
-        return static::assertMethodVisibilityAndArguments($classNamespace, $method, $visibilityType, $argumentsCount, $requiredArgumentsCount);
-    }
-
-    /**
-     * Asserts that class with given namespace has no constructor
-     *
-     * @param string $classNamespace Namespace of class that contains constructor to verify
-     */
-    protected static function assertHasNoConstructor($classNamespace)
-    {
-        /*
-         * Let's grab the constructor
-         */
-        $reflection = new ReflectionClass($classNamespace);
-        $constructor = $reflection->getConstructor();
-
-        static::assertNull($constructor);
-    }
-
-    /**
-     * Sets path of directory with data used by test cases
-     *
-     * @param string $testsDataDirPath Path of directory with data used by test cases
-     */
-    protected static function setTestsDataDirPath($testsDataDirPath)
-    {
-        static::$testsDataDirPath = $testsDataDirPath;
-    }
+    use BaseTestCaseTrait;
 }

src/Test/Base/BaseTypeTestCase.php

@@ -8,8 +8,7 @@
 
 namespace Meritoo\Common\Test\Base;
 
-use Generator;
-use Meritoo\Common\Type\Base\BaseType;
+use Meritoo\Common\Traits\Test\Base\BaseTypeTestCaseTrait;
 
 /**
  * Base test case for the type of something
@@ -19,48 +18,5 @@ use Meritoo\Common\Type\Base\BaseType;
  */
 abstract class BaseTypeTestCase extends BaseTestCase
 {
-    /**
-     * Verifies availability of all types
-     */
-    public function testAvailabilityOfAllTypes()
-    {
-        $available = $this->getTestedTypeInstance()->getAll();
-        $all = $this->getAllExpectedTypes();
-
-        static::assertEquals($all, $available);
-    }
-
-    /**
-     * Verifies whether given type is correct or not
-     *
-     * @param string $type     Type to verify
-     * @param bool   $expected Information if given type is correct or not
-     *
-     * @dataProvider provideTypeToVerify
-     */
-    public function testIfGivenTypeIsCorrect($type, $expected)
-    {
-        static::assertEquals($expected, $this->getTestedTypeInstance()->isCorrectType($type));
-    }
-
-    /**
-     * Provides type to verify and information if it's correct
-     *
-     * @return Generator
-     */
-    abstract public function provideTypeToVerify();
-
-    /**
-     * Returns instance of the tested type
-     *
-     * @return BaseType
-     */
-    abstract protected function getTestedTypeInstance();
-
-    /**
-     * Returns all expected types of the tested type
-     *
-     * @return array
-     */
-    abstract protected function getAllExpectedTypes();
+    use BaseTypeTestCaseTrait;
 }

src/Traits/Test/Base/BaseTestCaseTrait.php

@@ -0,0 +1,238 @@
+<?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\Common\Traits\Test\Base;
+
+use DateTime;
+use Generator;
+use Meritoo\Common\Exception\Type\UnknownOopVisibilityTypeException;
+use Meritoo\Common\Type\OopVisibilityType;
+use Meritoo\Common\Utilities\Miscellaneous;
+use ReflectionClass;
+use ReflectionMethod;
+
+/**
+ * BaseTestCaseTrait
+ * Created on 2017-11-02
+ *
+ * @author    Krzysztof Niziol <krzysztof.niziol@meritoo.pl>
+ * @copyright Meritoo.pl
+ */
+trait BaseTestCaseTrait
+{
+    /**
+     * Path of directory with data used by test cases
+     *
+     * @var string
+     */
+    private static $testsDataDirPath = '.data/tests';
+
+    /**
+     * Provides an empty value
+     *
+     * @return Generator
+     */
+    public function provideEmptyValue()
+    {
+        yield[''];
+        yield['   '];
+        yield[null];
+        yield[0];
+        yield[false];
+        yield[[]];
+    }
+
+    /**
+     * Provides boolean value
+     *
+     * @return Generator
+     */
+    public function provideBooleanValue()
+    {
+        yield[false];
+        yield[true];
+    }
+
+    /**
+     * Provides instance of DateTime class
+     *
+     * @return Generator
+     */
+    public function provideDateTimeInstance()
+    {
+        yield[new DateTime()];
+        yield[new DateTime('yesterday')];
+        yield[new DateTime('now')];
+        yield[new DateTime('tomorrow')];
+    }
+
+    /**
+     * Provides relative / compound format of DateTime
+     *
+     * @return Generator
+     */
+    public function provideDateTimeRelativeFormat()
+    {
+        yield['now'];
+        yield['yesterday'];
+        yield['tomorrow'];
+        yield['back of 10'];
+        yield['front of 10'];
+        yield['last day of February'];
+        yield['first day of next month'];
+        yield['last day of previous month'];
+        yield['last day of next month'];
+        yield['Y-m-d'];
+        yield['Y-m-d 10:00'];
+    }
+
+    /**
+     * Provides path of not existing file, e.g. "lorem/ipsum.jpg"
+     *
+     * @return Generator
+     */
+    public function provideNotExistingFilePath()
+    {
+        yield['lets-test.doc'];
+        yield['lorem/ipsum.jpg'];
+        yield['surprise/me/one/more/time.txt'];
+    }
+
+    /**
+     * Returns path of file used by tests.
+     * It should be placed in /.data/tests directory of this project.
+     *
+     * @param string $fileName      Name of file
+     * @param string $directoryPath (optional) Path of directory containing the file
+     * @return string
+     */
+    public function getFilePathForTesting($fileName, $directoryPath = '')
+    {
+        $rootPath = Miscellaneous::getProjectRootPath();
+
+        $paths = [
+            $rootPath,
+            self::$testsDataDirPath,
+            $directoryPath,
+            $fileName,
+        ];
+
+        return Miscellaneous::concatenatePaths($paths);
+    }
+
+    /**
+     * Verifies visibility and arguments of method
+     *
+     * @param string                  $classNamespace         Namespace of class that contains method to verify
+     * @param string|ReflectionMethod $method                 Name of method or just the method to verify
+     * @param string                  $visibilityType         Expected visibility of verified method. One of
+     *                                                        OopVisibilityType class constants.
+     * @param int                     $argumentsCount         (optional) Expected count/amount of arguments of the
+     *                                                        verified method
+     * @param int                     $requiredArgumentsCount (optional) Expected count/amount of required arguments
+     *                                                        of the verified method
+     * @throws UnknownOopVisibilityTypeException
+     *
+     * Attention. 2nd argument, the $method, may be:
+     * - string - name of the method
+     * - instance of ReflectionMethod - just the method (provided by ReflectionClass::getMethod() method)
+     */
+    protected static function assertMethodVisibilityAndArguments(
+        $classNamespace,
+        $method,
+        $visibilityType,
+        $argumentsCount = 0,
+        $requiredArgumentsCount = 0
+    ) {
+        /*
+         * Type of visibility is correct?
+         */
+        if (!(new OopVisibilityType())->isCorrectType($visibilityType)) {
+            throw new UnknownOopVisibilityTypeException($visibilityType);
+        }
+
+        $reflection = new ReflectionClass($classNamespace);
+
+        /*
+         * Name of method provided only?
+         * Let's find instance of the method (based on reflection)
+         */
+        if (!$method instanceof ReflectionMethod) {
+            $method = $reflection->getMethod($method);
+        }
+
+        switch ($visibilityType) {
+            case OopVisibilityType::IS_PUBLIC:
+                static::assertTrue($method->isPublic());
+                break;
+
+            case OopVisibilityType::IS_PROTECTED:
+                static::assertTrue($method->isProtected());
+                break;
+
+            case OopVisibilityType::IS_PRIVATE:
+                static::assertTrue($method->isPrivate());
+                break;
+        }
+
+        static::assertEquals($argumentsCount, $method->getNumberOfParameters());
+        static::assertEquals($requiredArgumentsCount, $method->getNumberOfRequiredParameters());
+    }
+
+    /**
+     * Verifies visibility and arguments of class constructor
+     *
+     * @param string $classNamespace         Namespace of class that contains constructor to verify
+     * @param string $visibilityType         Expected visibility of verified method. One of OopVisibilityType class
+     *                                       constants.
+     * @param int    $argumentsCount         (optional) Expected count/amount of arguments of the verified method
+     * @param int    $requiredArgumentsCount (optional) Expected count/amount of required arguments of the verified
+     *                                       method
+     * @throws UnknownOopVisibilityTypeException
+     */
+    protected static function assertConstructorVisibilityAndArguments(
+        $classNamespace,
+        $visibilityType,
+        $argumentsCount = 0,
+        $requiredArgumentsCount = 0
+    ) {
+        /*
+         * Let's grab the constructor
+         */
+        $reflection = new ReflectionClass($classNamespace);
+        $method = $reflection->getConstructor();
+
+        static::assertMethodVisibilityAndArguments($classNamespace, $method, $visibilityType, $argumentsCount, $requiredArgumentsCount);
+    }
+
+    /**
+     * Asserts that class with given namespace has no constructor
+     *
+     * @param string $classNamespace Namespace of class that contains constructor to verify
+     */
+    protected static function assertHasNoConstructor($classNamespace)
+    {
+        /*
+         * Let's grab the constructor
+         */
+        $reflection = new ReflectionClass($classNamespace);
+        $constructor = $reflection->getConstructor();
+
+        static::assertNull($constructor);
+    }
+
+    /**
+     * Sets path of directory with data used by test cases
+     *
+     * @param string $testsDataDirPath Path of directory with data used by test cases
+     */
+    protected static function setTestsDataDirPath($testsDataDirPath)
+    {
+        static::$testsDataDirPath = $testsDataDirPath;
+    }
+}

src/Traits/Test/Base/BaseTypeTestCaseTrait.php

@@ -0,0 +1,66 @@
+<?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\Common\Traits\Test\Base;
+
+use Generator;
+use Meritoo\Common\Type\Base\BaseType;
+
+/**
+ * Trait for the base test case for the type of something
+ *
+ * @author    Krzysztof Niziol <krzysztof.niziol@meritoo.pl>
+ * @copyright Meritoo.pl
+ */
+trait BaseTypeTestCaseTrait
+{
+    /**
+     * Verifies availability of all types
+     */
+    public function testAvailabilityOfAllTypes()
+    {
+        $available = $this->getTestedTypeInstance()->getAll();
+        $all = $this->getAllExpectedTypes();
+
+        static::assertEquals($all, $available);
+    }
+
+    /**
+     * Verifies whether given type is correct or not
+     *
+     * @param string $type     Type to verify
+     * @param bool   $expected Information if given type is correct or not
+     *
+     * @dataProvider provideTypeToVerify
+     */
+    public function testIfGivenTypeIsCorrect($type, $expected)
+    {
+        static::assertEquals($expected, $this->getTestedTypeInstance()->isCorrectType($type));
+    }
+
+    /**
+     * Provides type to verify and information if it's correct
+     *
+     * @return Generator
+     */
+    abstract public function provideTypeToVerify();
+
+    /**
+     * Returns instance of the tested type
+     *
+     * @return BaseType
+     */
+    abstract protected function getTestedTypeInstance();
+
+    /**
+     * Returns all expected types of the tested type
+     *
+     * @return array
+     */
+    abstract protected function getAllExpectedTypes();
+}

src/Type/DatePeriod.php

@@ -6,9 +6,11 @@
  * file that was distributed with this source code.
  */
 
-namespace Meritoo\Common\Utilities;
+namespace Meritoo\Common\Type;
 
 use DateTime;
+use Meritoo\Common\Type\Base\BaseType;
+use Meritoo\Common\Utilities\Date;
 
 /**
  * A date's period.
@@ -17,7 +19,7 @@ use DateTime;
  * @author    Krzysztof Niziol <krzysztof.niziol@meritoo.pl>
  * @copyright Meritoo.pl
  */
-class DatePeriod
+class DatePeriod extends BaseType
 {
     /**
      * The period constant: last month
@@ -108,17 +110,6 @@ class DatePeriod
         $this->endDate = $endDate;
     }
 
-    /**
-     * Returns information if given period is correct
-     *
-     * @param int $period The period to verify
-     * @return bool
-     */
-    public static function isCorrectPeriod($period)
-    {
-        return in_array($period, Reflection::getConstants(__CLASS__));
-    }
-
     /**
      * Returns formatted one of the period's date: start date or end date
      *

src/Utilities/Date.php

@@ -12,6 +12,7 @@ use DateInterval;
 use DateTime;
 use Meritoo\Common\Exception\Date\UnknownDatePartTypeException;
 use Meritoo\Common\Type\DatePartType;
+use Meritoo\Common\Type\DatePeriod;
 
 /**
  * Useful date methods
@@ -66,97 +67,105 @@ class Date
      * The dates are returned in an array with indexes 'start' and 'end'.
      *
      * @param int $period The period, type of period. One of DatePeriod class constants, e.g. DatePeriod::LAST_WEEK.
-     * @return DatePeriod
+     * @return null|DatePeriod
      */
     public static function getDatesForPeriod($period)
     {
-        $datePeriod = null;
-
-        if (DatePeriod::isCorrectPeriod($period)) {
-            $dateStart = null;
-            $dateEnd = null;
-
-            switch ($period) {
-                case DatePeriod::LAST_WEEK:
-                    $thisWeekStart = new DateTime('this week');
-
-                    $dateStart = clone $thisWeekStart;
-                    $dateEnd = clone $thisWeekStart;
-
-                    $dateStart->sub(new DateInterval('P7D'));
-                    $dateEnd->sub(new DateInterval('P1D'));
-
-                    break;
-                case DatePeriod::THIS_WEEK:
-                    $dateStart = new DateTime('this week');
-
-                    $dateEnd = clone $dateStart;
-                    $dateEnd->add(new DateInterval('P6D'));
-
-                    break;
-                case DatePeriod::NEXT_WEEK:
-                    $dateStart = new DateTime('this week');
-                    $dateStart->add(new DateInterval('P7D'));
-
-                    $dateEnd = clone $dateStart;
-                    $dateEnd->add(new DateInterval('P6D'));
-
-                    break;
-                case DatePeriod::LAST_MONTH:
-                    $dateStart = new DateTime('first day of last month');
-                    $dateEnd = new DateTime('last day of last month');
-
-                    break;
-                case DatePeriod::THIS_MONTH:
-                    $lastMonth = self::getDatesForPeriod(DatePeriod::LAST_MONTH);
-                    $nextMonth = self::getDatesForPeriod(DatePeriod::NEXT_MONTH);
-
-                    $dateStart = $lastMonth->getEndDate();
-                    $dateStart->add(new DateInterval('P1D'));
-
-                    $dateEnd = $nextMonth->getStartDate();
-                    $dateEnd->sub(new DateInterval('P1D'));
-
-                    break;
-                case DatePeriod::NEXT_MONTH:
-                    $dateStart = new DateTime('first day of next month');
-                    $dateEnd = new DateTime('last day of next month');
-
-                    break;
-                case DatePeriod::LAST_YEAR:
-                case DatePeriod::THIS_YEAR:
-                case DatePeriod::NEXT_YEAR:
-                    $dateStart = new DateTime();
-                    $dateEnd = new DateTime();
-
-                    if (DatePeriod::LAST_YEAR == $period || DatePeriod::NEXT_YEAR == $period) {
-                        $yearDifference = 1;
-
-                        if (DatePeriod::LAST_YEAR == $period) {
-                            $yearDifference *= -1;
-                        }
-
-                        $modifyString = sprintf('%s year', $yearDifference);
-                        $dateStart->modify($modifyString);
-                        $dateEnd->modify($modifyString);
-                    }
-
-                    $year = $dateStart->format('Y');
-                    $dateStart->setDate($year, 1, 1);
-                    $dateEnd->setDate($year, 12, 31);
-
-                    break;
-            }
-
-            if (null !== $dateStart && null !== $dateEnd) {
-                $dateStart->setTime(0, 0, 0);
-                $dateEnd->setTime(23, 59, 59);
-
-                $datePeriod = new DatePeriod($dateStart, $dateEnd);
-            }
+        /*
+         * Type of period is incorrect?
+         * Nothing to do
+         */
+        if (!(new DatePeriod())->isCorrectType($period)) {
+            return null;
         }
 
-        return $datePeriod;
+        $dateStart = null;
+        $dateEnd = null;
+
+        switch ($period) {
+            case DatePeriod::LAST_WEEK:
+                $thisWeekStart = new DateTime('this week');
+
+                $dateStart = clone $thisWeekStart;
+                $dateEnd = clone $thisWeekStart;
+
+                $dateStart->sub(new DateInterval('P7D'));
+                $dateEnd->sub(new DateInterval('P1D'));
+
+                break;
+            case DatePeriod::THIS_WEEK:
+                $dateStart = new DateTime('this week');
+
+                $dateEnd = clone $dateStart;
+                $dateEnd->add(new DateInterval('P6D'));
+
+                break;
+            case DatePeriod::NEXT_WEEK:
+                $dateStart = new DateTime('this week');
+                $dateStart->add(new DateInterval('P7D'));
+
+                $dateEnd = clone $dateStart;
+                $dateEnd->add(new DateInterval('P6D'));
+
+                break;
+            case DatePeriod::LAST_MONTH:
+                $dateStart = new DateTime('first day of last month');
+                $dateEnd = new DateTime('last day of last month');
+
+                break;
+            case DatePeriod::THIS_MONTH:
+                $lastMonth = self::getDatesForPeriod(DatePeriod::LAST_MONTH);
+                $nextMonth = self::getDatesForPeriod(DatePeriod::NEXT_MONTH);
+
+                $dateStart = $lastMonth->getEndDate();
+                $dateStart->add(new DateInterval('P1D'));
+
+                $dateEnd = $nextMonth->getStartDate();
+                $dateEnd->sub(new DateInterval('P1D'));
+
+                break;
+            case DatePeriod::NEXT_MONTH:
+                $dateStart = new DateTime('first day of next month');
+                $dateEnd = new DateTime('last day of next month');
+
+                break;
+            case DatePeriod::LAST_YEAR:
+            case DatePeriod::THIS_YEAR:
+            case DatePeriod::NEXT_YEAR:
+                $dateStart = new DateTime();
+                $dateEnd = new DateTime();
+
+                if (DatePeriod::LAST_YEAR == $period || DatePeriod::NEXT_YEAR == $period) {
+                    $yearDifference = 1;
+
+                    if (DatePeriod::LAST_YEAR == $period) {
+                        $yearDifference *= -1;
+                    }
+
+                    $modifyString = sprintf('%s year', $yearDifference);
+                    $dateStart->modify($modifyString);
+                    $dateEnd->modify($modifyString);
+                }
+
+                $year = $dateStart->format('Y');
+                $dateStart->setDate($year, 1, 1);
+                $dateEnd->setDate($year, 12, 31);
+
+                break;
+        }
+
+        /*
+         * Start or end date is unknown?
+         * Nothing to do
+         */
+        if (null === $dateStart || null === $dateEnd) {
+            return null;
+        }
+
+        $dateStart->setTime(0, 0, 0);
+        $dateEnd->setTime(23, 59, 59);
+
+        return new DatePeriod($dateStart, $dateEnd);
     }
 
     /**

src/Utilities/QueryBuilderUtility.php

@@ -33,6 +33,10 @@ class QueryBuilderUtility
     {
         $aliases = $queryBuilder->getRootAliases();
 
+        /*
+         * No aliases?
+         * Nothing to do
+         */
         if (empty($aliases)) {
             return null;
         }
@@ -42,7 +46,8 @@ class QueryBuilderUtility
 
     /**
      * Returns alias of given property joined in given query builder
-     * If the join does not exist, null is returned.
+     *
+     * If there are no joins or the join does not exist, null is returned.
      * It's also information if given property is already joined in given query builder.
      *
      * @param QueryBuilder $queryBuilder The query builder to verify
@@ -53,6 +58,10 @@ class QueryBuilderUtility
     {
         $joins = $queryBuilder->getDQLPart('join');
 
+        /*
+         * No joins?
+         * Nothing to do
+         */
         if (empty($joins)) {
             return null;
         }
@@ -99,33 +108,43 @@ class QueryBuilderUtility
      */
     public static function setCriteria(QueryBuilder $queryBuilder, array $criteria = [], $alias = '')
     {
-        if (!empty($criteria)) {
-            if (empty($alias)) {
-                $alias = self::getRootAlias($queryBuilder);
-            }
+        /*
+         * No criteria used in WHERE clause?
+         * Nothing to do
+         */
+        if (empty($criteria)) {
+            return $queryBuilder;
+        }
 
-            foreach ($criteria as $column => $value) {
-                $compareOperator = '=';
+        /*
+         * No alias provided?
+         * Let's use root alias
+         */
+        if (empty($alias)) {
+            $alias = self::getRootAlias($queryBuilder);
+        }
 
-                if (is_array($value) && !empty($value)) {
-                    if (2 == count($value)) {
-                        $compareOperator = $value[1];
-                    }
+        foreach ($criteria as $column => $value) {
+            $compareOperator = '=';
 
-                    $value = $value[0];
+            if (is_array($value) && !empty($value)) {
+                if (2 == count($value)) {
+                    $compareOperator = $value[1];
                 }
 
-                $predicate = sprintf('%s.%s %s :%s', $alias, $column, $compareOperator, $column);
-
-                if (null === $value) {
-                    $predicate = $queryBuilder->expr()->isNull(sprintf('%s.%s', $alias, $column));
-                    unset($criteria[$column]);
-                } else {
-                    $queryBuilder->setParameter($column, $value);
-                }
-
-                $queryBuilder = $queryBuilder->andWhere($predicate);
+                $value = $value[0];
             }
+
+            $predicate = sprintf('%s.%s %s :%s', $alias, $column, $compareOperator, $column);
+
+            if (null === $value) {
+                $predicate = $queryBuilder->expr()->isNull(sprintf('%s.%s', $alias, $column));
+                unset($criteria[$column]);
+            } else {
+                $queryBuilder->setParameter($column, $value);
+            }
+
+            $queryBuilder = $queryBuilder->andWhere($predicate);
         }
 
         return $queryBuilder;
@@ -143,7 +162,7 @@ class QueryBuilderUtility
     public static function deleteEntities(EntityManager $entityManager, $entities, $flushDeleted = true)
     {
         /*
-         * No entities found?
+         * No entities provided?
          * Nothing to do
          */
         if (empty($entities)) {
@@ -169,24 +188,30 @@ class QueryBuilderUtility
      * Attention. Existing parameters will be overridden.
      *
      * @param QueryBuilder          $queryBuilder The query builder
-     * @param array|ArrayCollection $parameters   Parameters to add. Collection of instances of
-     *                                            Doctrine\ORM\Query\Parameter class or an array with key-value pairs.
+     * @param array|ArrayCollection $parameters   Parameters to add. Collection of Doctrine\ORM\Query\Parameter
+     *                                            instances or an array with key-value pairs.
      * @return QueryBuilder
      */
     public static function addParameters(QueryBuilder $queryBuilder, $parameters)
     {
-        if (!empty($parameters)) {
-            foreach ($parameters as $key => $parameter) {
-                $name = $key;
-                $value = $parameter;
+        /*
+         * No parameters?
+         * Nothing to do
+         */
+        if (empty($parameters)) {
+            return $queryBuilder;
+        }
 
-                if ($parameter instanceof Parameter) {
-                    $name = $parameter->getName();
-                    $value = $parameter->getValue();
-                }
+        foreach ($parameters as $key => $parameter) {
+            $name = $key;
+            $value = $parameter;
 
-                $queryBuilder->setParameter($name, $value);
+            if ($parameter instanceof Parameter) {
+                $name = $parameter->getName();
+                $value = $parameter->getValue();
             }
+
+            $queryBuilder->setParameter($name, $value);
         }
 
         return $queryBuilder;

src/Utilities/Reflection.php

@@ -74,8 +74,8 @@ class Reflection
     }
 
     /**
-     * Returns maximum constant from all constants of given class / object.
-     * Values of constants should be integers.
+     * Returns maximum integer value of constant of given class / object.
+     * Constants whose values are integers are considered only.
      *
      * @param object|string $class The object or name of object's class
      * @return int|null

tests/Test/Base/BaseTestCaseTest.php

@@ -55,7 +55,9 @@ class BaseTestCaseTest extends BaseTestCase
 
     public function testProvideDateTimeInstance()
     {
-        $elements = [
+        $dateFormat = 'Y-m-d H:i';
+
+        $expectedElements = [
             [new DateTime()],
             [new DateTime('yesterday')],
             [new DateTime('now')],
@@ -63,7 +65,25 @@ class BaseTestCaseTest extends BaseTestCase
         ];
 
         $generator = (new SimpleTestCase())->provideDateTimeInstance();
-        self::assertEquals($elements, GeneratorUtility::getGeneratorElements($generator));
+        $generatedElements = GeneratorUtility::getGeneratorElements($generator);
+
+        /* @var DateTime $instance1 */
+        $instance1 = $generatedElements[0][0];
+
+        /* @var DateTime $instance2 */
+        $instance2 = $generatedElements[1][0];
+
+        /* @var DateTime $instance3 */
+        $instance3 = $generatedElements[2][0];
+
+        /* @var DateTime $instance4 */
+        $instance4 = $generatedElements[3][0];
+
+        self::assertCount(count($expectedElements), $generatedElements);
+        self::assertEquals($instance1->format($dateFormat), (new DateTime())->format($dateFormat));
+        self::assertEquals($instance2->format($dateFormat), (new DateTime('yesterday'))->format($dateFormat));
+        self::assertEquals($instance3->format($dateFormat), (new DateTime('now'))->format($dateFormat));
+        self::assertEquals($instance4->format($dateFormat), (new DateTime('tomorrow'))->format($dateFormat));
     }
 
     public function testProvideDateTimeRelativeFormat()

tests/Type/DatePeriodTest.php

@@ -6,13 +6,13 @@
  * file that was distributed with this source code.
  */
 
-namespace Meritoo\Common\Test\Utilities;
+namespace Meritoo\Common\Test\Type;
 
 use DateTime;
 use Generator;
-use Meritoo\Common\Test\Base\BaseTestCase;
+use Meritoo\Common\Test\Base\BaseTypeTestCase;
+use Meritoo\Common\Type\DatePeriod;
 use Meritoo\Common\Type\OopVisibilityType;
-use Meritoo\Common\Utilities\DatePeriod;
 
 /**
  * Test case of date's period
@@ -20,7 +20,7 @@ use Meritoo\Common\Utilities\DatePeriod;
  * @author    Krzysztof Niziol <krzysztof.niziol@meritoo.pl>
  * @copyright Meritoo.pl
  */
-class DatePeriodTest extends BaseTestCase
+class DatePeriodTest extends BaseTypeTestCase
 {
     public function testConstructorVisibilityAndArguments()
     {
@@ -58,33 +58,6 @@ class DatePeriodTest extends BaseTestCase
         self::assertEquals($endDate, $period->getEndDate());
     }
 
-    /**
-     * @param mixed $period Empty value, e.g. ""
-     * @dataProvider provideEmptyValue
-     */
-    public function testIsCorrectPeriodEmptyPeriod($period)
-    {
-        self::assertFalse(DatePeriod::isCorrectPeriod($period));
-    }
-
-    /**
-     * @param int $period Incorrect period to verify
-     * @dataProvider provideIncorrectPeriod
-     */
-    public function testIsCorrectPeriodIncorrectPeriod($period)
-    {
-        self::assertFalse(DatePeriod::isCorrectPeriod($period));
-    }
-
-    /**
-     * @param int $period The period to verify
-     * @dataProvider providePeriod
-     */
-    public function testIsCorrectPeriod($period)
-    {
-        self::assertTrue(DatePeriod::isCorrectPeriod($period));
-    }
-
     /**
      * @param DatePeriod $period The date period to verify
      * @param string     $format Format used to format the date
@@ -142,36 +115,6 @@ class DatePeriodTest extends BaseTestCase
         ];
     }
 
-    /**
-     * Provides incorrect period
-     *
-     * @return Generator
-     */
-    public function provideIncorrectPeriod()
-    {
-        yield[-1];
-        yield[0];
-        yield[10];
-    }
-
-    /**
-     * Provides period to verify
-     *
-     * @return Generator
-     */
-    public function providePeriod()
-    {
-        yield[DatePeriod::LAST_WEEK];
-        yield[DatePeriod::THIS_WEEK];
-        yield[DatePeriod::NEXT_WEEK];
-        yield[DatePeriod::LAST_MONTH];
-        yield[DatePeriod::THIS_MONTH];
-        yield[DatePeriod::NEXT_MONTH];
-        yield[DatePeriod::LAST_YEAR];
-        yield[DatePeriod::THIS_YEAR];
-        yield[DatePeriod::NEXT_YEAR];
-    }
-
     /**
      * Provides period and incorrect format of date to verify
      *
@@ -270,4 +213,68 @@ class DatePeriodTest extends BaseTestCase
             '2002-02-02 00:00',
         ];
     }
+
+    /**
+     * Returns all expected types of the tested type
+     *
+     * @return array
+     */
+    protected function getAllExpectedTypes()
+    {
+        return [
+            'LAST_MONTH' => DatePeriod::LAST_MONTH,
+            'LAST_WEEK'  => DatePeriod::LAST_WEEK,
+            'LAST_YEAR'  => DatePeriod::LAST_YEAR,
+            'NEXT_MONTH' => DatePeriod::NEXT_MONTH,
+            'NEXT_WEEK'  => DatePeriod::NEXT_WEEK,
+            'NEXT_YEAR'  => DatePeriod::NEXT_YEAR,
+            'THIS_MONTH' => DatePeriod::THIS_MONTH,
+            'THIS_WEEK'  => DatePeriod::THIS_WEEK,
+            'THIS_YEAR'  => DatePeriod::THIS_YEAR,
+        ];
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function getTestedTypeInstance()
+    {
+        return new DatePeriod();
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function provideTypeToVerify()
+    {
+        yield[
+            '',
+            false,
+        ];
+
+        yield[
+            -1,
+            false,
+        ];
+
+        yield[
+            true,
+            false,
+        ];
+
+        yield[
+            DatePeriod::LAST_MONTH,
+            true,
+        ];
+
+        yield[
+            DatePeriod::NEXT_WEEK,
+            true,
+        ];
+
+        yield[
+            DatePeriod::THIS_YEAR,
+            true,
+        ];
+    }
 }

tests/Utilities/DateTest.php

@@ -13,6 +13,7 @@ use DateTime;
 use Generator;
 use Meritoo\Common\Exception\Date\UnknownDatePartTypeException;
 use Meritoo\Common\Test\Base\BaseTestCase;
+use Meritoo\Common\Type\DatePeriod;
 use Meritoo\Common\Utilities\Date;
 
 /**
@@ -506,6 +507,35 @@ class DateTest extends BaseTestCase
         self::assertTrue($randomDate >= $intervalMinDate && $randomDate <= $intervalMaxDate);
     }
 
+    /**
+     * @param mixed $period Empty value, e.g. ""
+     * @dataProvider provideEmptyValue
+     */
+    public function testGetDatesForPeriodUsingEmptyPeriod($period)
+    {
+        self::assertNull(Date::getDatesForPeriod($period));
+    }
+
+    /**
+     * @param int $period Incorrect period to verify
+     * @dataProvider provideIncorrectPeriod
+     */
+    public function testGetDatesForPeriodUsingIncorrectPeriod($period)
+    {
+        self::assertNull(Date::getDatesForPeriod($period));
+    }
+
+    /**
+     * @param int        $period   The period, type of period. One of DatePeriod class constants, e.g. DatePeriod::LAST_WEEK.
+     * @param DatePeriod $expected Expected start and end date for given period
+     *
+     * @dataProvider provideCorrectPeriod
+     */
+    public function testGetDatesForPeriod($period, DatePeriod $expected)
+    {
+        self::assertEquals($expected, Date::getDatesForPeriod($period));
+    }
+
     /**
      * Provides incorrect invalidCount of DateTime
      *
@@ -758,4 +788,112 @@ class DateTest extends BaseTestCase
             50,
         ];
     }
+
+    /**
+     * Provides incorrect period
+     *
+     * @return Generator
+     */
+    public function provideIncorrectPeriod()
+    {
+        yield[-1];
+        yield[0];
+        yield[10];
+    }
+
+    /**
+     * Provides correct period
+     *
+     * @return Generator
+     */
+    public function provideCorrectPeriod()
+    {
+        yield[
+            DatePeriod::LAST_WEEK,
+            new DatePeriod(
+                (new DateTime('this week'))->sub(new DateInterval('P7D'))->setTime(0, 0, 0),
+                (new DateTime('this week'))->sub(new DateInterval('P1D'))->setTime(23, 59, 59)
+            ),
+        ];
+
+        yield[
+            DatePeriod::THIS_WEEK,
+            new DatePeriod(
+                (new DateTime('this week'))->setTime(0, 0, 0),
+                (new DateTime('this week'))->add(new DateInterval('P6D'))->setTime(23, 59, 59)
+            ),
+        ];
+
+        yield[
+            DatePeriod::NEXT_WEEK,
+            new DatePeriod(
+                (new DateTime('this week'))->add(new DateInterval('P7D'))->setTime(0, 0, 0),
+                (new DateTime('this week'))->add(new DateInterval('P7D'))->add(new DateInterval('P6D'))->setTime(23, 59, 59)
+            ),
+        ];
+
+        yield[
+            DatePeriod::LAST_MONTH,
+            new DatePeriod(
+                (new DateTime('first day of last month'))->setTime(0, 0, 0),
+                (new DateTime('last day of last month'))->setTime(23, 59, 59)
+            ),
+        ];
+
+        yield[
+            DatePeriod::THIS_MONTH,
+            new DatePeriod(
+                Date::getDatesForPeriod(DatePeriod::LAST_MONTH)
+                    ->getEndDate()
+                    ->add(new DateInterval('P1D'))
+                    ->setTime(0, 0, 0),
+                Date::getDatesForPeriod(DatePeriod::NEXT_MONTH)
+                    ->getStartDate()
+                    ->sub(new DateInterval('P1D'))
+                    ->setTime(23, 59, 59)
+            ),
+        ];
+
+        yield[
+            DatePeriod::NEXT_MONTH,
+            new DatePeriod(
+                (new DateTime('first day of next month'))->setTime(0, 0, 0),
+                (new DateTime('last day of next month'))->setTime(23, 59, 59)
+            ),
+        ];
+
+        $lastYearStart = (new DateTime())->modify('-1 year');
+        $lastYearEnd = (new DateTime())->modify('-1 year');
+        $year = $lastYearStart->format('Y');
+
+        yield[
+            DatePeriod::LAST_YEAR,
+            new DatePeriod(
+                $lastYearStart->setDate($year, 1, 1)->setTime(0, 0, 0),
+                $lastYearEnd->setDate($year, 12, 31)->setTime(23, 59, 59)
+            ),
+        ];
+
+        $year = (new DateTime())->format('Y');
+
+        yield[
+            DatePeriod::THIS_YEAR,
+            new DatePeriod(
+                (new DateTime())->setDate($year, 1, 1)->setTime(0, 0, 0),
+                (new DateTime())->setDate($year, 12, 31)->setTime(23, 59, 59)
+            ),
+        ];
+
+        $nextYearStart = (new DateTime())->modify('1 year');
+        $nextYearEnd = (new DateTime())->modify('1 year');
+        $year = $nextYearStart->format('Y');
+
+        yield[
+            DatePeriod::NEXT_YEAR,
+            new DatePeriod(
+                $nextYearStart->setDate($year, 1, 1)->setTime(0, 0, 0),
+                $nextYearEnd->setDate($year, 12, 31)->setTime(23, 59, 59)
+            ),
+        ];
+    }
 }

tests/Utilities/QueryBuilderUtilityTest.php

@@ -0,0 +1,341 @@
+<?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\Common\Test\Utilities;
+
+use Doctrine\Common\Collections\ArrayCollection;
+use Doctrine\ORM\EntityManager;
+use Doctrine\ORM\EntityManagerInterface;
+use Doctrine\ORM\Query\Expr;
+use Doctrine\ORM\Query\Parameter;
+use Doctrine\ORM\QueryBuilder;
+use Generator;
+use Meritoo\Common\Test\Base\BaseTestCase;
+use Meritoo\Common\Utilities\QueryBuilderUtility;
+
+/**
+ * Test case of the useful methods for query builder (the Doctrine's QueryBuilder class)
+ *
+ * @author    Krzysztof Niziol <krzysztof.niziol@meritoo.pl>
+ * @copyright Meritoo.pl
+ */
+class QueryBuilderUtilityTest extends BaseTestCase
+{
+    public function testConstructor()
+    {
+        static::assertHasNoConstructor(QueryBuilderUtility::class);
+    }
+
+    /**
+     * @param QueryBuilder $queryBuilder The query builder to retrieve root alias
+     * @param null|string  $rootAlias    Expected root alias of given query builder
+     *
+     * @dataProvider provideQueryBuilderAndRootAlias
+     */
+    public function testGetRootAlias(QueryBuilder $queryBuilder, $rootAlias)
+    {
+        static::assertSame($rootAlias, QueryBuilderUtility::getRootAlias($queryBuilder));
+    }
+
+    /**
+     * @param QueryBuilder $queryBuilder  The query builder to verify
+     * @param string       $propertyName  Name of property that maybe is joined
+     * @param null|string  $propertyAlias Expected alias of given property joined in given query builder
+     *
+     * @dataProvider provideQueryBuilderAndPropertyAlias
+     */
+    public function testGetJoinedPropertyAlias(QueryBuilder $queryBuilder, $propertyName, $propertyAlias)
+    {
+        static::assertSame($propertyAlias, QueryBuilderUtility::getJoinedPropertyAlias($queryBuilder, $propertyName));
+    }
+
+    public function testSetCriteriaWithoutCriteria()
+    {
+        $entityManager = $this->getMock(EntityManagerInterface::class);
+        $queryBuilder = new QueryBuilder($entityManager);
+        $newQueryBuilder = QueryBuilderUtility::setCriteria($queryBuilder);
+
+        static::assertSame($queryBuilder, $newQueryBuilder);
+        static::assertCount(0, $newQueryBuilder->getParameters());
+        static::assertNull($newQueryBuilder->getDQLPart('where'));
+    }
+
+    public function testSetCriteriaWithoutAlias()
+    {
+        $criteria = [
+            'lorem' => 11,
+            'ipsum' => 22,
+        ];
+
+        $entityManager = $this->getMock(EntityManagerInterface::class);
+        $queryBuilder = new QueryBuilder($entityManager);
+        $newQueryBuilder = QueryBuilderUtility::setCriteria($queryBuilder, $criteria);
+
+        static::assertSame($queryBuilder, $newQueryBuilder);
+        static::assertCount(count($criteria), $newQueryBuilder->getParameters());
+        static::assertNotNull($newQueryBuilder->getDQLPart('where'));
+    }
+
+    /**
+     * @param QueryBuilder $queryBuilder The query builder
+     * @param array        $criteria     The criteria used in WHERE clause
+     *
+     * @dataProvider provideQueryBuilderAndCriteria
+     */
+    public function testSetCriteria(QueryBuilder $queryBuilder, array $criteria)
+    {
+        $newQueryBuilder = QueryBuilderUtility::setCriteria($queryBuilder, $criteria);
+        $criteriaCount = count($criteria);
+        $nullsCount = 0;
+
+        /*
+         * I have to verify count/amount of NULLs and decrease $criteriaCount, because for null parameter is not added
+         */
+        array_walk($criteria, function ($value) use (&$nullsCount) {
+            if (null === $value) {
+                ++$nullsCount;
+            }
+        });
+
+        static::assertSame($queryBuilder, $newQueryBuilder);
+        static::assertCount($criteriaCount - $nullsCount, $newQueryBuilder->getParameters());
+        static::assertNotNull($newQueryBuilder->getDQLPart('where'));
+    }
+
+    public function testDeleteEntitiesWithoutFlush()
+    {
+        $methods = [
+            'remove',
+            'flush',
+        ];
+
+        $entityManager = $this->getMock(EntityManager::class, $methods, [], '', false);
+        $entities1 = [];
+
+        $entities2 = [
+            new \stdClass(),
+        ];
+
+        static::assertFalse(QueryBuilderUtility::deleteEntities($entityManager, $entities1, false));
+        static::assertTrue(QueryBuilderUtility::deleteEntities($entityManager, $entities2, false));
+    }
+
+    public function testDeleteEntities()
+    {
+        $methods = [
+            'remove',
+            'flush',
+        ];
+
+        $entityManager = $this->getMock(EntityManager::class, $methods, [], '', false);
+        $entities1 = [];
+
+        $entities2 = [
+            new \stdClass(),
+        ];
+
+        static::assertFalse(QueryBuilderUtility::deleteEntities($entityManager, $entities1));
+        static::assertTrue(QueryBuilderUtility::deleteEntities($entityManager, $entities2));
+    }
+
+    /**
+     * @param QueryBuilder          $queryBuilder The query builder
+     * @param array|ArrayCollection $parameters   Parameters to add. Collection of Doctrine\ORM\Query\Parameter
+     *                                            instances or an array with key-value pairs.
+     *
+     * @dataProvider provideQueryBuilderAndParameters
+     */
+    public function testAddParameters(QueryBuilder $queryBuilder, $parameters)
+    {
+        $newQueryBuilder = QueryBuilderUtility::addParameters($queryBuilder, $parameters);
+
+        static::assertSame($queryBuilder, $newQueryBuilder);
+        static::assertCount(count($parameters), $newQueryBuilder->getParameters());
+    }
+
+    /**
+     * Provides query builder to retrieve root alias and expected root alias
+     *
+     * @return Generator
+     */
+    public function provideQueryBuilderAndRootAlias()
+    {
+        $entityManager = $this->getMock(EntityManagerInterface::class);
+
+        yield[
+            new QueryBuilder($entityManager),
+            null,
+        ];
+
+        yield[
+            (new QueryBuilder($entityManager))->from('lorem_ipsum', 'lm'),
+            'lm',
+        ];
+
+        yield[
+            (new QueryBuilder($entityManager))
+                ->from('lorem', 'l')
+                ->leftJoin('l.ipsum', 'i'),
+            'l',
+        ];
+    }
+
+    /**
+     * Provides query builder, name of property and expected alias of given property
+     *
+     * @return Generator
+     */
+    public function provideQueryBuilderAndPropertyAlias()
+    {
+        $entityManager = $this->getMock(EntityManagerInterface::class);
+
+        yield[
+            new QueryBuilder($entityManager),
+            '',
+            null,
+        ];
+
+        yield[
+            new QueryBuilder($entityManager),
+            'lorem',
+            null,
+        ];
+
+        yield[
+            (new QueryBuilder($entityManager))->from('lorem_ipsum', 'lm'),
+            'lm',
+            null,
+        ];
+
+        yield[
+            (new QueryBuilder($entityManager))
+                ->from('lorem', 'l')
+                ->leftJoin('l.ipsum', 'i'),
+            'ipsum',
+            'i',
+        ];
+
+        yield[
+            (new QueryBuilder($entityManager))
+                ->from('lorem', 'l')
+                ->leftJoin('l.ipsum', 'i')
+                ->innerJoin('i.dolor', 'd'),
+            'ipsum1',
+            null,
+        ];
+
+        yield[
+            (new QueryBuilder($entityManager))
+                ->from('lorem', 'l')
+                ->leftJoin('l.ipsum', 'i')
+                ->innerJoin('i.dolor', 'd'),
+            'ipsum',
+            'i',
+        ];
+
+        yield[
+            (new QueryBuilder($entityManager))
+                ->from('lorem', 'l')
+                ->leftJoin('l.ipsum', 'i')
+                ->innerJoin('i.dolor', 'd'),
+            'dolor',
+            'd',
+        ];
+    }
+
+    /**
+     * Provides query builder and criteria used in WHERE clause
+     *
+     * @return Generator
+     */
+    public function provideQueryBuilderAndCriteria()
+    {
+        $entityManager = $this->getMock(EntityManager::class, ['getExpressionBuilder'], [], '', false);
+
+        $entityManager
+            ->expects(static::any())
+            ->method('getExpressionBuilder')
+            ->willReturn(new Expr());
+
+        yield[
+            (new QueryBuilder($entityManager))->from('lorem_ipsum', 'lm'),
+            [
+                'lorem' => 11,
+                'ipsum' => 22,
+                'dolor' => null,
+            ],
+        ];
+
+        yield[
+            (new QueryBuilder($entityManager))->from('lorem_ipsum', 'lm'),
+            [
+                'lorem' => [
+                    11,
+                    '>=',
+                ],
+                'ipsum' => [
+                    22,
+                    '<',
+                ],
+                'dolor' => null,
+            ],
+        ];
+    }
+
+    /**
+     * Provides query builder and parameters to add to given query builder
+     *
+     * @return Generator
+     */
+    public function provideQueryBuilderAndParameters()
+    {
+        $entityManager = $this->getMock(EntityManagerInterface::class);
+
+        yield[
+            new QueryBuilder($entityManager),
+            [],
+        ];
+
+        yield[
+            new QueryBuilder($entityManager),
+            new ArrayCollection(),
+        ];
+
+        yield[
+            new QueryBuilder($entityManager),
+            [
+                'lorem' => 11,
+                'ipsum' => 22,
+            ],
+        ];
+
+        yield[
+            new QueryBuilder($entityManager),
+            new ArrayCollection([
+                'lorem' => 11,
+                'ipsum' => 22,
+            ]),
+        ];
+
+        yield[
+            new QueryBuilder($entityManager),
+            [
+                new Parameter('lorem', 11),
+                new Parameter('ipsum', 22),
+            ],
+        ];
+
+        yield[
+            new QueryBuilder($entityManager),
+            new ArrayCollection([
+                new Parameter('lorem', 11),
+                new Parameter('ipsum', 22),
+            ]),
+        ];
+    }
+}

tests/Utilities/Reflection/B.php

@@ -15,7 +15,7 @@ namespace Meritoo\Common\Test\Utilities\Reflection;
  * @author    Krzysztof Niziol <krzysztof.niziol@meritoo.pl>
  * @copyright Meritoo.pl
  */
-class B extends A
+class B extends A implements I
 {
     protected $name = 'Lorem Ipsum';
 

tests/Utilities/Reflection/H.php

@@ -0,0 +1,27 @@
+<?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\Common\Test\Utilities\Reflection;
+
+/**
+ * The H class.
+ * Used for testing the Reflection class.
+ *
+ * @author    Krzysztof Niziol <krzysztof.niziol@meritoo.pl>
+ * @copyright Meritoo.pl
+ */
+class H
+{
+    const DOLOR = 'sit';
+
+    const LOREM = 'ipsum';
+
+    const MAX_USERS = 5;
+
+    const MIN_USERS = 2;
+}

tests/Utilities/Reflection/I.php

@@ -0,0 +1,20 @@
+<?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\Common\Test\Utilities\Reflection;
+
+/**
+ * The H interface.
+ * Used for testing the Reflection class.
+ *
+ * @author    Krzysztof Niziol <krzysztof.niziol@meritoo.pl>
+ * @copyright Meritoo.pl
+ */
+interface I
+{
+}

tests/Utilities/ReflectionTest.php

@@ -22,6 +22,8 @@ use Meritoo\Common\Test\Utilities\Reflection\D;
 use Meritoo\Common\Test\Utilities\Reflection\E;
 use Meritoo\Common\Test\Utilities\Reflection\F;
 use Meritoo\Common\Test\Utilities\Reflection\G;
+use Meritoo\Common\Test\Utilities\Reflection\H;
+use Meritoo\Common\Test\Utilities\Reflection\I;
 use Meritoo\Common\Utilities\Reflection;
 use ReflectionProperty;
 
@@ -379,6 +381,99 @@ class ReflectionTest extends BaseTestCase
         self::assertEquals($expected, Reflection::getPropertyValues($collection, 'gInstance.firstName', true));
     }
 
+    public function testGetMaxNumberConstantUsingClassWithoutConstants()
+    {
+        static::assertNull(Reflection::getMaxNumberConstant(A::class));
+    }
+
+    public function testGetMaxNumberConstant()
+    {
+        static::assertEquals(5, Reflection::getMaxNumberConstant(H::class));
+    }
+
+    public function testHasMethodUsingClassWithoutMethod()
+    {
+        static::assertFalse(Reflection::hasMethod(A::class, 'getUser'));
+    }
+
+    public function testHasMethod()
+    {
+        static::assertTrue(Reflection::hasMethod(A::class, 'getCount'));
+    }
+
+    public function testHasPropertyUsingClassWithoutProperty()
+    {
+        static::assertFalse(Reflection::hasProperty(A::class, 'users'));
+    }
+
+    public function testHasProperty()
+    {
+        static::assertTrue(Reflection::hasProperty(A::class, 'count'));
+    }
+
+    public function testHasConstantUsingClassWithoutConstant()
+    {
+        static::assertFalse(Reflection::hasConstant(H::class, 'users'));
+    }
+
+    public function testHasConstant()
+    {
+        static::assertTrue(Reflection::hasConstant(H::class, 'LOREM'));
+    }
+
+    public function testGetConstantValueUsingClassWithoutConstant()
+    {
+        static::assertNull(Reflection::getConstantValue(H::class, 'users'));
+    }
+
+    public function testGetConstantValue()
+    {
+        static::assertEquals(H::LOREM, Reflection::getConstantValue(H::class, 'LOREM'));
+    }
+
+    public function testIsInterfaceImplementedUsingClassWithoutInterface()
+    {
+        static::assertFalse(Reflection::isInterfaceImplemented(A::class, I::class));
+    }
+
+    public function testIsInterfaceImplemented()
+    {
+        static::assertTrue(Reflection::isInterfaceImplemented(B::class, I::class));
+    }
+
+    public function testIsChildOfClassUsingClassWithoutChildClass()
+    {
+        static::assertFalse(Reflection::isChildOfClass(A::class, B::class));
+    }
+
+    public function testIsChildOfClass()
+    {
+        static::assertTrue(Reflection::isChildOfClass(B::class, A::class));
+    }
+
+    public function testGetPropertyUsingClassWithoutProperty()
+    {
+        static::assertNull(Reflection::getProperty(A::class, 'lorem'));
+    }
+
+    public function testGetPropertyUsingClassWithPrivateProperty()
+    {
+        $property = Reflection::getProperty(A::class, 'count', ReflectionProperty::IS_PRIVATE);
+
+        static::assertInstanceOf(ReflectionProperty::class, $property);
+        static::assertTrue($property->isPrivate());
+        static::assertEquals('count', $property->getName());
+    }
+
+    public function testGetPropertyUsingClassWithProtectedProperty()
+    {
+        $property = Reflection::getProperty(B::class, 'name', ReflectionProperty::IS_PROTECTED);
+
+        static::assertInstanceOf(ReflectionProperty::class, $property);
+        static::assertTrue($property->isProtected());
+        static::assertEquals('name', $property->getName());
+    }
+
     /**
      * Provides invalid class and trait
      *