MDL-63977 Behat: Add generic way to get tag list

lib/behat/behat_base.php

@@ -647,6 +647,16 @@ class behat_base extends Behat\MinkExtension\Context\RawMinkContext {
         return;
     }
 
+    /**
+     * Checks if the current scenario, or its feature, has a specified tag.
+     *
+     * @param string $tag Tag to check
+     * @return bool True if the tag exists in scenario or feature
+     */
+    public function has_tag(string $tag) : bool {
+        return array_key_exists($tag, behat_hooks::get_tags_for_scenario());
+    }
+
     /**
      * Change browser window size.
      *   - small: 640x480

lib/tests/behat/behat_app.php

@@ -29,7 +29,6 @@ require_once(__DIR__ . '/../../behat/behat_base.php');
 
 use Behat\Mink\Exception\DriverException;
 use Behat\Mink\Exception\ExpectationException;
-use Behat\Behat\Hook\Scope\BeforeScenarioScope;
 
 /**
  * Mobile/desktop app steps definitions.
@@ -40,9 +39,6 @@ use Behat\Behat\Hook\Scope\BeforeScenarioScope;
  * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
 class behat_app extends behat_base {
-    /** @var bool True if the current scenario has the app tag */
-    protected $apptag = false;
-
     /** @var stdClass Object with data about launched Ionic instance (if any) */
     protected static $ionicrunning = null;
 
@@ -55,17 +51,6 @@ class behat_app extends behat_base {
         return strtoupper(substr(PHP_OS, 0, 3)) === 'WIN';
     }
 
-    /**
-     * Checks tags before each scenario.
-     *
-     * @BeforeScenario
-     * @param BeforeScenarioScope $scope Scope information
-     */
-    public function check_tags(BeforeScenarioScope $scope) {
-        $this->apptag = in_array('app', $scope->getScenario()->getTags()) ||
-                in_array('app', $scope->getFeature()->getTags());
-    }
-
     /**
      * Opens the Moodle app in the browser.
      *
@@ -101,7 +86,7 @@ class behat_app extends behat_base {
         global $CFG;
 
         // Check the app tag was set.
-        if (!$this->apptag) {
+        if (!$this->has_tag('app')) {
             throw new DriverException('Requires @app tag on scenario or feature.');
         }
 

lib/tests/behat/behat_hooks.php

@@ -103,6 +103,11 @@ class behat_hooks extends behat_base {
      */
     protected static $runningsuite = '';
 
+    /**
+     * @var array Array (with tag names in keys) of all tags in current scenario.
+     */
+    protected static $scenariotags;
+
     /**
      * Hook to capture BeforeSuite event so as to give access to moodle codebase.
      * This will try and catch any exception and exists if anything fails.
@@ -384,6 +389,30 @@ class behat_hooks extends behat_base {
 
         // Run all test with medium (1024x768) screen size, to avoid responsive problems.
         $this->resize_window('medium');
+
+        // Set up the tags for current scenario.
+        self::fetch_tags_for_scenario($scope);
+    }
+
+    /**
+     * Sets up the tags for the current scenario.
+     *
+     * @param \Behat\Behat\Hook\Scope\BeforeScenarioScope $scope Scope
+     */
+    protected static function fetch_tags_for_scenario(\Behat\Behat\Hook\Scope\BeforeScenarioScope $scope) {
+        self::$scenariotags = array_flip(array_merge(
+            $scope->getScenario()->getTags(),
+            $scope->getFeature()->getTags()
+        ));
+    }
+
+    /**
+     * Gets the tags for the current scenario
+     *
+     * @return array Array where key is tag name and value is an integer
+     */
+    public static function get_tags_for_scenario() : array {
+        return self::$scenariotags;
     }
 
     /**