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);
    }
    
    /**
     * @covers ::getCallableFromDefinition
     */
    public function testCallbackResolver() : void {
        $cases = [
            'Inline function' => [
                function ($suffix) {
                    return __METHOD__ . '+' . $suffix;
                },
                'Drupal\\Tests\\Core\\Utility\\{closure}',
            ],
            'First-class callable function' => [
                $this->method(...),
                __CLASS__ . '::method',
            ],
            'First-class callable static' => [
                static::staticMethod(...),
                __CLASS__ . '::staticMethod',
            ],
            'Arrow function' => [
                fn($suffix) => __METHOD__ . '+' . $suffix,
                'Drupal\\Tests\\Core\\Utility\\{closure}',
            ],
            '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);
        }
    }
    
    /**
     * @dataProvider callableResolverExceptionHandlingTestCases
     * @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() {
        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) {
        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) {
        return __METHOD__ . '+' . $suffix;
    }
    
    /**
     * A test __invoke method.
     *
     * @param string $suffix
     *   A suffix to append.
     *
     * @return string
     *   A test string.
     */
    public function __invoke($suffix) {
        return __METHOD__ . '+' . $suffix;
    }

}