Tests - use Docker (as environment guard)

.docker/config/Dockerfile

@@ -0,0 +1,42 @@
+FROM php:5.6-cli
+
+#
+# Tools & libraries
+#
+RUN apt-get update && apt-get install -y \
+    libicu-dev
+
+#
+# PHP Extensions
+#
+RUN docker-php-ext-install \
+    intl
+
+#
+# Timezone
+#
+ARG TIMEZONE
+RUN echo "date.timezone = $TIMEZONE" >> /usr/local/etc/php/php.ini
+
+#
+# Xdebug
+#
+RUN pecl install xdebug \
+    && docker-php-ext-enable xdebug
+COPY xdebug.ini /usr/local/etc/php/conf.d/docker-php-ext-xdebug.ini
+
+#
+# Phing
+#
+RUN pear channel-discover pear.phing.info \
+    && pear install [--alldeps] phing/phing
+
+#
+# Composer
+#
+RUN php -r "copy('https://getcomposer.org/installer', 'composer-setup.php');" \
+    && php -r "if (hash_file('SHA384', 'composer-setup.php') === \
+    '544e09ee996cdf60ece3804abc52599c22b1f40f4323403c44d44fdfdd586475ca9813a858088ffbc1f233e9b180f061') { echo \
+    'Installer verified'; } else { echo 'Installer corrupt'; unlink('composer-setup.php'); } echo PHP_EOL;" \
+    && php composer-setup.php --install-dir=/usr/local/bin --filename=composer \
+    && php -r "unlink('composer-setup.php');"

.docker/config/xdebug.ini

@@ -0,0 +1,7 @@
+[xdebug]
+zend_extension='xdebug.so'
+
+xdebug.remote_enable=1
+xdebug.remote_connect_back=1
+xdebug.idekey='PHPSTORM'
+xdebug.remote_port=9001

.env

@@ -0,0 +1 @@
+TIMEZONE=Europe/Warsaw

README.md

@@ -13,6 +13,15 @@ $ composer require meritoo/common-library
 
 > How to install Composer: https://getcomposer.org/download
 
+## Rebuilding project and tests running
+
+```bash
+$ docker-compose up -d
+$ docker-compose exec php-cli phing
+```
+
+> What is Docker? https://www.docker.com/what-docker
+
 ## Static methods
 
 This package contains a lot of class with static methods, so usage is not so complicated. Just run the static method who would you like to use. Example:

docker-compose.yml

@@ -0,0 +1,15 @@
+version: '3'
+
+services:
+    php-cli:
+        image: php-cli
+        container_name: php-cli
+        working_dir: /project
+        entrypoint: php
+        command: -S 0.0.0.0:99
+        build:
+            context: ./.docker/config
+            args:
+                - TIMEZONE=$TIMEZONE
+        volumes:
+            - .:/project