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web/core/tests/Drupal/Tests/TestRequirementsTrait.php

@@ -0,0 +1,91 @@
+<?php
+
+namespace Drupal\Tests;
+
+use Drupal\Core\Extension\ExtensionDiscovery;
+
+/**
+ * Allows test classes to require Drupal modules as dependencies.
+ *
+ * This trait is assumed to be on a subclass of \PHPUnit_Framework_TestCase, and
+ * overrides \PHPUnit_Framework_TestCase::checkRequirements(). This allows the
+ * test to be marked as skipped before any kernel boot processes have happened.
+ */
+trait TestRequirementsTrait {
+
+  /**
+   * Returns the Drupal root directory.
+   *
+   * @return string
+   */
+  protected static function getDrupalRoot() {
+    return dirname(dirname(substr(__DIR__, 0, -strlen(__NAMESPACE__))));
+  }
+
+  /**
+   * Check module requirements for the Drupal use case.
+   *
+   * This method is assumed to override
+   * \PHPUnit_Framework_TestCase::checkRequirements().
+   *
+   * @throws \PHPUnit_Framework_SkippedTestError
+   *   Thrown when the requirements are not met, and this test should be
+   *   skipped. Callers should not catch this exception.
+   */
+  protected function checkRequirements() {
+    parent::checkRequirements();
+
+    $root = static::getDrupalRoot();
+
+    // Check if required dependencies exist.
+    $annotations = $this->getAnnotations();
+    if (!empty($annotations['class']['requires'])) {
+      $this->checkModuleRequirements($root, $annotations['class']['requires']);
+    }
+    if (!empty($annotations['method']['requires'])) {
+      $this->checkModuleRequirements($root, $annotations['method']['requires']);
+    }
+  }
+
+  /**
+   * Checks missing module requirements.
+   *
+   * Iterates through a list of requires annotations and looks for missing
+   * modules. The test will be skipped if any of the required modules is
+   * missing.
+   *
+   * @param string $root
+   *   The path to the root of the Drupal installation to scan.
+   * @param string[] $annotations
+   *   A list of requires annotations from either a method or class annotation.
+   *
+   * @throws \PHPUnit_Framework_SkippedTestError
+   *   Thrown when the requirements are not met, and this test should be
+   *   skipped. Callers should not catch this exception.
+   */
+  private function checkModuleRequirements($root, array $annotations) {
+    // drupal_valid_ua() might not be loaded.
+    require_once $root . '/core/includes/bootstrap.inc';
+
+    // Make a list of required modules.
+    $required_modules = [];
+    foreach ($annotations as $requirement) {
+      if (strpos($requirement, 'module ') === 0) {
+        $required_modules[] = trim(str_replace('module ', '', $requirement));
+      }
+    }
+
+    // If there are required modules, check if they're available.
+    if (!empty($required_modules)) {
+      // Scan for modules.
+      $discovery = new ExtensionDiscovery($root, FALSE);
+      $discovery->setProfileDirectories([]);
+      $list = array_keys($discovery->scan('module'));
+      $not_available = array_diff($required_modules, $list);
+      if (!empty($not_available)) {
+        throw new \PHPUnit_Framework_SkippedTestError('Required modules: ' . implode(', ', $not_available));
+      }
+    }
+  }
+
+}