class PluginManagerBaseTest

class PluginManagerBaseTest extends TestCase {
    
    /**
     * A callback method for mocking FactoryInterface objects.
     */
    public function createInstanceCallback() {
        $args = func_get_args();
        $plugin_id = $args[0];
        $configuration = $args[1];
        if ('invalid' == $plugin_id) {
            throw new PluginNotFoundException($plugin_id);
        }
        return [
            'plugin_id' => $plugin_id,
            'configuration' => $configuration,
        ];
    }
    
    /**
     * Generates a mocked FactoryInterface object with known properties.
     */
    public function getMockFactoryInterface($expects_count) {
        $mock_factory = $this->getMockBuilder('Drupal\\Component\\Plugin\\Factory\\FactoryInterface')
            ->setMethods([
            'createInstance',
        ])
            ->getMockForAbstractClass();
        $mock_factory->expects($this->exactly($expects_count))
            ->method('createInstance')
            ->willReturnCallback([
            $this,
            'createInstanceCallback',
        ]);
        return $mock_factory;
    }
    
    /**
     * Tests createInstance() with no fallback methods.
     *
     * @covers ::createInstance
     */
    public function testCreateInstance() {
        $manager = $this->getMockBuilder('Drupal\\Component\\Plugin\\PluginManagerBase')
            ->getMockForAbstractClass();
        // PluginManagerBase::createInstance() looks for a factory object and then
        // calls createInstance() on it. So we have to mock a factory object.
        $factory_ref = new \ReflectionProperty($manager, 'factory');
        $factory_ref->setAccessible(TRUE);
        $factory_ref->setValue($manager, $this->getMockFactoryInterface(1));
        // Finally the test.
        $configuration_array = [
            'config' => 'something',
        ];
        $result = $manager->createInstance('valid', $configuration_array);
        $this->assertEquals('valid', $result['plugin_id']);
        $this->assertEquals($configuration_array, $result['configuration']);
    }
    
    /**
     * Tests createInstance() with a fallback method.
     *
     * @covers ::createInstance
     */
    public function testCreateInstanceFallback() {
        // We use our special stub class which extends PluginManagerBase and also
        // implements FallbackPluginManagerInterface.
        $manager = new StubFallbackPluginManager();
        // Put our stubbed factory on the base object.
        $factory_ref = new \ReflectionProperty($manager, 'factory');
        $factory_ref->setAccessible(TRUE);
        // Set up the configuration array.
        $configuration_array = [
            'config' => 'something',
        ];
        // Test with fallback interface and valid plugin_id.
        $factory_ref->setValue($manager, $this->getMockFactoryInterface(1));
        $no_fallback_result = $manager->createInstance('valid', $configuration_array);
        $this->assertEquals('valid', $no_fallback_result['plugin_id']);
        $this->assertEquals($configuration_array, $no_fallback_result['configuration']);
        // Test with fallback interface and invalid plugin_id.
        $factory_ref->setValue($manager, $this->getMockFactoryInterface(2));
        $fallback_result = $manager->createInstance('invalid', $configuration_array);
        $this->assertEquals('invalid_fallback', $fallback_result['plugin_id']);
        $this->assertEquals($configuration_array, $fallback_result['configuration']);
    }
    
    /**
     * @covers ::getInstance
     */
    public function testGetInstance() {
        $options = [
            'foo' => 'F00',
            'bar' => 'bAr',
        ];
        $instance = new \stdClass();
        $mapper = $this->prophesize(MapperInterface::class);
        $mapper->getInstance($options)
            ->shouldBeCalledTimes(1)
            ->willReturn($instance);
        $manager = new StubPluginManagerBaseWithMapper($mapper->reveal());
        $this->assertEquals($instance, $manager->getInstance($options));
    }
    
    /**
     * @covers ::getInstance
     */
    public function testGetInstanceWithoutMapperShouldThrowException() {
        $options = [
            'foo' => 'F00',
            'bar' => 'bAr',
        ];
        
        /** @var \Drupal\Component\Plugin\PluginManagerBase $manager */
        $manager = $this->getMockBuilder(PluginManagerBase::class)
            ->getMockForAbstractClass();
        // Set the expected exception thrown by ::getInstance.
        $this->expectException(\BadMethodCallException::class);
        $this->expectExceptionMessage(sprintf('%s does not support this method unless %s::$mapper is set.', get_class($manager), get_class($manager)));
        $manager->getInstance($options);
    }

}