Improve tests

docs/dockers/docker-compose.yml

@@ -0,0 +1,19 @@
+version: '2'
+services:
+    php5:
+        container_name: mage-php5
+        build: ./php5
+        volumes:
+            - ../../:/home/magephp
+
+    php7.0:
+        container_name: mage-php7.0
+        build: ./php7.0
+        volumes:
+            - ../../:/home/magephp
+
+    php7.1:
+        container_name: mage-php7.1
+        build: ./php7.1
+        volumes:
+            - ../../:/home/magephp

docs/dockers/php5/Dockerfile

@@ -0,0 +1,9 @@
+FROM ubuntu:14.04
+
+RUN apt-get update && apt-get upgrade -y
+RUN apt-get install -y vim curl git unzip
+RUN apt-get install -y php5-cli php5-curl
+
+RUN curl -sS https://getcomposer.org/installer | php -- --install-dir=/usr/bin/ --filename=composer
+
+WORKDIR /home/magephp

docs/dockers/php7.0/Dockerfile

@@ -0,0 +1,9 @@
+FROM ubuntu:16.04
+
+RUN apt-get update && apt-get upgrade -y
+RUN apt-get install -y vim curl git unzip
+RUN apt-get install -y php7.0-cli php-zip php7.0-curl php7.0-xml
+
+RUN curl -sS https://getcomposer.org/installer | php -- --install-dir=/usr/bin/ --filename=composer
+
+WORKDIR /home/magephp

docs/dockers/php7.1/Dockerfile

@@ -0,0 +1,9 @@
+FROM ubuntu:17.10
+
+RUN apt-get update && apt-get upgrade -y
+RUN apt-get install -y vim curl git unzip
+RUN apt-get install -y php7.1-cli php-zip php7.1-curl php7.1-xml
+
+RUN curl -sS https://getcomposer.org/installer | php -- --install-dir=/usr/bin/ --filename=composer
+
+WORKDIR /home/magephp