class CallableResolverTest

class CallableResolverTest extends UnitTestCase {
  
  /**
   * The callable resolver.
   *
   * @var \Drupal\Core\Utility\CallableResolver
   */
  protected CallableResolver $resolver;
  
  /**
   * {@inheritdoc}
   */
  protected function setUp() : void {
    parent::setUp();
    $container = new ContainerBuilder();
    $container->set('test_service', $this);
    $class_resolver = new ClassResolver($container);
    $this->resolver = new CallableResolver($class_resolver);
  }
  
  /**
   * Tests callback resolver.
   *
   * @legacy-covers ::getCallableFromDefinition
   */
  public function testCallbackResolver() : void {
    $cases = [
      'Inline function' => [
        function ($suffix) {
          return __METHOD__ . '+' . $suffix;
        },
        '{closure:Drupal\\Tests\\Core\\Utility\\CallableResolverTest::testCallbackResolver():53}',
      ],
      'First-class callable function' => [
        $this->method(...),
        __CLASS__ . '::method',
      ],
      'First-class callable static' => [
        static::staticMethod(...),
        __CLASS__ . '::staticMethod',
      ],
      'Arrow function' => [
        fn($suffix): string => __METHOD__ . '+' . $suffix,
        '{closure:Drupal\\Tests\\Core\\Utility\\CallableResolverTest::testCallbackResolver():67}',
      ],
      'Static function' => [
        '\\Drupal\\Tests\\Core\\Utility\\NoInstantiationMockStaticCallable::staticMethod',
        'Drupal\\Tests\\Core\\Utility\\NoInstantiationMockStaticCallable::staticMethod',
      ],
      'Static function, array notation' => [
        [
          NoInstantiationMockStaticCallable::class,
          'staticMethod',
        ],
        'Drupal\\Tests\\Core\\Utility\\NoInstantiationMockStaticCallable::staticMethod',
      ],
      'Static function, array notation, with object' => [
        [
          $this,
          'staticMethod',
        ],
        __CLASS__ . '::staticMethod',
      ],
      'Non-static function, array notation, with object' => [
        [
          $this,
          'method',
        ],
        __CLASS__ . '::method',
      ],
      'Non-static function, instantiated by class resolver' => [
        MethodCallable::class . '::method',
        MethodCallable::class . '::method',
      ],
      'Non-static function, instantiated by class resolver, container injection' => [
        '\\Drupal\\Tests\\Core\\Utility\\MockContainerInjection::getResult',
        'Drupal\\Tests\\Core\\Utility\\MockContainerInjection::getResult-foo',
      ],
      'Service notation' => [
        'test_service:method',
        __CLASS__ . '::method',
      ],
      'Service notation, static method' => [
        'test_service:staticMethod',
        __CLASS__ . '::staticMethod',
      ],
      'Class with invoke method' => [
        MethodCallable::class,
        MethodCallable::class . '::__invoke',
      ],
    ];
    $argument = 'bar';
    foreach ($cases as $label => [$definition, $result]) {
      $this->assertEquals($result . '+' . $argument, $this->resolver
        ->getCallableFromDefinition($definition)($argument), $label);
    }
  }
  
  /**
   * Tests callback resolver exception handling.
   *
   * @legacy-covers ::getCallableFromDefinition
   */
  public function testCallbackResolverExceptionHandling($definition, $exception_class, $exception_message) : void {
    $this->expectException($exception_class);
    $this->expectExceptionMessage($exception_message);
    $this->resolver
      ->getCallableFromDefinition($definition);
  }
  
  /**
   * Test cases for ::testCallbackResolverExceptionHandling.
   */
  public static function callableResolverExceptionHandlingTestCases() : array {
    return [
      'String function' => [
        'not_a_callable',
        \InvalidArgumentException::class,
        'Class "not_a_callable" does not exist.',
      ],
      'Array notation' => [
        [
          'not_a_callable',
          'not_a_callable',
        ],
        \InvalidArgumentException::class,
        'The callable definition provided "[not_a_callable,not_a_callable]" is not a valid callable.',
      ],
      'Missing method on class, array notation' => [
        [
          \stdClass::class,
          'method_not_exists',
        ],
        \InvalidArgumentException::class,
        'The callable definition provided "[stdClass,method_not_exists]" is not a valid callable.',
      ],
      'Missing method on class, static notation' => [
        \stdClass::class . '::method_not_exists',
        \InvalidArgumentException::class,
        'The callable definition provided was invalid. Either class "stdClass" does not have a method "method_not_exists", or it is not callable.',
      ],
      'Missing class, static notation' => [
        '\\NotARealClass::method',
        \InvalidArgumentException::class,
        'Class "\\NotARealClass" does not exist.',
      ],
      'No method, static notation' => [
        NoMethodCallable::class . "::",
        \InvalidArgumentException::class,
        'The callable definition provided was invalid. Could not get class and method from definition "Drupal\\Tests\\Core\\Utility\\NoMethodCallable::".',
      ],
      'Service not in container' => [
        'bad_service:method',
        \InvalidArgumentException::class,
        'Class "bad_service" does not exist.',
      ],
      'Invalid method on valid service' => [
        'test_service:not_a_callable',
        \InvalidArgumentException::class,
        'The callable definition provided was invalid. Either class "Drupal\\Tests\\Core\\Utility\\CallableResolverTest" does not have a method "not_a_callable", or it is not callable.',
      ],
    ];
  }
  
  /**
   * A test static method that returns "foo".
   *
   * @param string $suffix
   *   A suffix to append.
   *
   * @return string
   *   A test string.
   */
  public static function staticMethod($suffix) : string {
    return __METHOD__ . '+' . $suffix;
  }
  
  /**
   * A test method that returns "foo".
   *
   * @param string $suffix
   *   A suffix to append.
   *
   * @return string
   *   A test string.
   *
   * @throws \Exception
   *   Throws an exception when called statically.
   */
  public function method($suffix) : string {
    return __METHOD__ . '+' . $suffix;
  }
  
  /**
   * A test __invoke method.
   *
   * @param string $suffix
   *   A suffix to append.
   *
   * @return string
   *   A test string.
   */
  public function __invoke($suffix) : string {
    return __METHOD__ . '+' . $suffix;
  }

}