Merge pull request #1164 from mailpoet/acceptance_js_errors

Add JS error checking to acceptance tests [MAILPOET-1179]

tests/_support/Helper/Acceptance.php

@@ -5,5 +5,50 @@ namespace Helper;
 
 class Acceptance extends \Codeception\Module
 {
+  protected $js_errors = array();
 
+  /**
+   * Note: Selenium JS error log buffer is cleared after logs retrieval:
+   * https://github.com/SeleniumHQ/selenium/wiki/Logging#retrieval-of-logs
+   */
+  function seeNoJSErrors() {
+    $wd = $this->getModule('WPWebDriver');
+
+    try {
+      $logEntries = array_slice(
+        $wd->webDriver->manage()->getLog('browser'),
+        -15 // Number of log entries to tail
+      );
+
+      foreach($logEntries as $logEntry) {
+        if($this->isJSError($logEntry)) {
+          // Collect JS errors into an array
+          $this->js_errors[] = $logEntry['message'];
+        }
+      }
+
+      if(!empty($this->js_errors)) {
+        $this->debug('JS errors : ' . print_r($this->js_errors, true));
+      }
+    } catch (\Exception $e) {
+      $this->debug('Unable to retrieve Selenium logs : ' . $e->getMessage());
+    }
+
+    // String comparison is used to show full error messages in test fail diffs
+    $this->assertEquals('', join(PHP_EOL, $this->js_errors), 'JS errors are present');
+  }
+
+  protected function isJSError($logEntry) {
+    return isset($logEntry['level'])
+      && isset($logEntry['message'])
+      && isset($logEntry['source'])
+      && $logEntry['level'] === 'SEVERE'
+      && ($logEntry['source'] === 'javascript' // Native JS errors
+        || ($logEntry['source'] === 'network' && preg_match('/\.(js|css)/i', $logEntry['message'])) // JS/CSS files failed to load
+      );
+  }
+
+  function _after() {
+    $this->js_errors = array();
+  }
 }

tests/acceptance/SubscriptionFormCest.php

@@ -14,6 +14,7 @@ class SubscriptionFormCest
     $I->fillField('input[title="Email"]', 'test-email@example.com');
     $I->click('.mailpoet_submit');
     $I->waitForText('Check your inbox or spam folder to confirm your subscription.', 3, '.mailpoet_validate_success');
+    $I->seeNoJSErrors();
   }
 
   function _after(\AcceptanceTester $I) {