add cache and coverage support for CI

.gitlab-ci.yml

@@ -2,17 +2,18 @@ stages:
   - test
 
 before_script:
-  - apt-get -qq update
-  - apt-get -qq install --yes zip unzip
-  - curl --silent https://composer.github.io/installer.sig > installer.sig
-  - php -r "copy('https://getcomposer.org/installer', 'composer-setup.php');"
-  - php -r "if (hash_file('SHA384', 'composer-setup.php') === file_get_contents('installer.sig')) { echo 'Installer verified'; } else { echo 'Installer corrupt'; unlink('composer-setup.php'); } echo PHP_EOL;"
-  - php composer-setup.php
-  - php -r "unlink('composer-setup.php'); unlink('installer.sig');"
+  - apt-get -yqq update
+  - apt-get -yqq install zip unzip
+  - curl -sS https://composer.github.io/installer | php
+
+cache:
+  paths:
+    - vendor/
+    - ./ot_core/.Build/vendor
 
 unit_otcore:
   stage: test
 
   script:
     - php composer.phar --quiet --no-interaction --working-dir=./ot_core install
-    - ./ot_core/.Build/bin/phpunit -c ./ot_core/Tests/Build/UnitTests.xml
+    - ./ot_core/.Build/bin/phpunit -c ./ot_core/Tests/Build/UnitTests.xml --coverage-text