Add running PHP unit test coverage reports in CircleCI

RoboFile.php

@@ -114,15 +114,20 @@ class RoboFile extends \Robo\Tasks {
     $this->_exec($command);
   }
 
-  function testCoverage($file = null) {
+  function testCoverage($opts=['file' => null, 'xml' => false]) {
     $this->loadEnv();
     $this->_exec('vendor/bin/codecept build');
-    $this->_exec(join(' ', array(
+    $command = join(' ', array(
       'vendor/bin/codecept run',
-      (($file) ? $file : ''),
+      (($opts['file']) ? $opts['file'] : ''),
       '--coverage',
-      '--coverage-html'
-    )));
+      ($opts['xml']) ? '--coverage-xml' : '--coverage-html'
+    ));
+
+    if($opts['xml']) {
+      $command .= ' --xml';
+    }
+    $this->_exec($command);
   }
 
   function testJavascript($xml_output_file = null) {

circle.yml

@@ -31,6 +31,10 @@ dependencies:
       # Create .env file with correct path to WP installation
     - echo "WP_TEST_PATH=\"/home/ubuntu/mailpoet/wordpress\"" > .env
 
+      # Enable XDebug for coverage reports.
+      # Comment out if not running PHP coverage reports, for performance
+    - sed -i 's/^;//' /opt/circleci/php/$(phpenv global)/etc/conf.d/xdebug.ini
+
 ## tests override
 test:
   override:
@@ -39,7 +43,11 @@ test:
     - ./do t:j $CIRCLE_TEST_REPORTS/mocha/junit.xml
 
     # Run PHP tests
-    - ./do t:u --xml
+    #- ./do t:u --xml
+    # Uncomment to run coverage tests instead
+    - ./do t:c --xml
     # Copy the report
     - mkdir $CIRCLE_TEST_REPORTS/codeception
     - cp tests/_output/report.xml $CIRCLE_TEST_REPORTS/codeception/report.xml
+    # Uncomment to copy PHP coverage report
+    - cp tests/_output/coverage.xml $CIRCLE_TEST_REPORTS/codeception/coverage.xml