Install composer

.circleci/config.yml

@@ -6,7 +6,16 @@ jobs:
             - image: php:7.1
         steps:
             - checkout
-            - run: composer install
+            - run:
+                name: Install Composer
+                command: |
+                    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 && \
+                    php -r "unlink('composer-setup.php');" \
+                    chmod +x ./composer.phar && \
+                    mv ./composer.phar /usr/local/bin/composer
+            - run: composer install --no-interaction --prefer-dist
             - run: ./vendor/bin/phpunit
 
 workflows: