MediaSourceTest.php

<?php

namespace Drupal\Tests\media\Kernel;

use Drupal\Core\Form\FormState;
use Drupal\field\Entity\FieldConfig;
use Drupal\field\Entity\FieldStorageConfig;
use Drupal\media\Entity\Media;
use Drupal\media\Entity\MediaType;

/**
 * Tests media source plugins related logic.
 *
 * @group media
 */
class MediaSourceTest extends MediaKernelTestBase {
    
    /**
     * Tests that metadata is correctly mapped irrespective of how media is saved.
     */
    public function testSave() {
        $field_storage = FieldStorageConfig::create([
            'entity_type' => 'media',
            'field_name' => 'field_to_map_to',
            'type' => 'string',
        ]);
        $field_storage->save();
        FieldConfig::create([
            'field_storage' => $field_storage,
            'bundle' => $this->testMediaType
                ->id(),
            'label' => 'Field to map to',
        ])
            ->save();
        // Set an arbitrary metadata value to be mapped.
        $this->container
            ->get('state')
            ->set('media_source_test_attributes', [
            'attribute_to_map' => [
                'title' => 'Attribute to map',
                'value' => 'Snowball',
            ],
            'thumbnail_uri' => [
                'value' => 'public://TheSisko.png',
            ],
        ]);
        $this->testMediaType
            ->setFieldMap([
            'attribute_to_map' => 'field_to_map_to',
        ])
            ->save();
        
        /** @var \Drupal\Core\Entity\EntityStorageInterface $storage */
        $storage = $this->container
            ->get('entity_type.manager')
            ->getStorage('media');
        
        /** @var \Drupal\media\MediaInterface $a */
        $a = $storage->create([
            'bundle' => $this->testMediaType
                ->id(),
        ]);
        
        /** @var \Drupal\media\MediaInterface $b */
        $b = $storage->create([
            'bundle' => $this->testMediaType
                ->id(),
        ]);
        // Set a random source value on both items.
        $a->set($a->getSource()
            ->getSourceFieldDefinition($a->bundle->entity)
            ->getName(), $this->randomString());
        $b->set($b->getSource()
            ->getSourceFieldDefinition($b->bundle->entity)
            ->getName(), $this->randomString());
        $a->save();
        $storage->save($b);
        // Assert that the default name was mapped into the name field for both
        // media items.
        $this->assertFalse($a->get('name')
            ->isEmpty());
        $this->assertFalse($b->get('name')
            ->isEmpty());
        // Assert that arbitrary metadata was mapped correctly.
        $this->assertFalse($a->get('field_to_map_to')
            ->isEmpty());
        $this->assertFalse($b->get('field_to_map_to')
            ->isEmpty());
        // Assert that the thumbnail was mapped correctly from the source.
        $this->assertSame('public://TheSisko.png', $a->thumbnail->entity
            ->getFileUri());
        $this->assertSame('public://TheSisko.png', $b->thumbnail->entity
            ->getFileUri());
    }
    
    /**
     * Tests default media name functionality.
     */
    public function testDefaultName() {
        // Make sure that the default name is set if not provided by the user.
        
        /** @var \Drupal\media\MediaInterface $media */
        $media = Media::create([
            'bundle' => $this->testMediaType
                ->id(),
        ]);
        $media_source = $media->getSource();
        $this->assertSame('default_name', $media_source->getPluginDefinition()['default_name_metadata_attribute'], 'Default metadata attribute is not used for the default name.');
        $this->assertSame('media:' . $media->bundle() . ':' . $media->uuid(), $media_source->getMetadata($media, 'default_name'), 'Value of the default name metadata attribute does not look correct.');
        $this->assertSame('media:' . $media->bundle() . ':' . $media->uuid(), $media->getName(), 'Default name was not used correctly by getName().');
        $this->assertSame($media->getName(), $media->label(), 'Default name and label are not the same.');
        $media->save();
        $this->assertSame('media:' . $media->bundle() . ':' . $media->uuid(), $media->getName(), 'Default name was not saved correctly.');
        $this->assertSame($media->getName(), $media->label(), 'The label changed during save.');
        // Make sure that the user-supplied name is used.
        
        /** @var \Drupal\media\MediaInterface $media */
        $name = 'User-supplied name';
        $media = Media::create([
            'bundle' => $this->testMediaType
                ->id(),
            'name' => $name,
        ]);
        $media_source = $media->getSource();
        $this->assertSame('default_name', $media_source->getPluginDefinition()['default_name_metadata_attribute'], 'Default metadata attribute is not used for the default name.');
        $this->assertSame('media:' . $media->bundle() . ':' . $media->uuid(), $media_source->getMetadata($media, 'default_name'), 'Value of the default name metadata attribute does not look correct.');
        $media->save();
        $this->assertSame($name, $media->getName(), 'User-supplied name was not set correctly.');
        $this->assertSame($media->getName(), $media->label(), 'The user-supplied name does not match the label.');
        // Change the default name attribute and see if it is used to set the name.
        $name = 'Old Major';
        \Drupal::state()->set('media_source_test_attributes', [
            'alternative_name' => [
                'title' => 'Alternative name',
                'value' => $name,
            ],
        ]);
        \Drupal::state()->set('media_source_test_definition', [
            'default_name_metadata_attribute' => 'alternative_name',
        ]);
        
        /** @var \Drupal\media\MediaInterface $media */
        $media = Media::create([
            'bundle' => $this->testMediaType
                ->id(),
        ]);
        $media_source = $media->getSource();
        $this->assertSame('alternative_name', $media_source->getPluginDefinition()['default_name_metadata_attribute'], 'Correct metadata attribute is not used for the default name.');
        $this->assertSame($name, $media_source->getMetadata($media, 'alternative_name'), 'Value of the default name metadata attribute does not look correct.');
        $media->save();
        $this->assertSame($name, $media->getName(), 'Default name was not set correctly.');
        $this->assertSame($media->getName(), $media->label(), 'The default name does not match the label.');
    }
    
    /**
     * Tests metadata mapping functionality.
     */
    public function testMetadataMapping() {
        $field_name = 'field_to_map_to';
        $attribute_name = 'attribute_to_map';
        $storage = FieldStorageConfig::create([
            'entity_type' => 'media',
            'field_name' => $field_name,
            'type' => 'string',
        ]);
        $storage->save();
        FieldConfig::create([
            'field_storage' => $storage,
            'bundle' => $this->testMediaType
                ->id(),
            'label' => 'Field to map to',
        ])
            ->save();
        // Save the entity without defining the metadata mapping and check that the
        // field stays empty.
        
        /** @var \Drupal\media\MediaInterface $media */
        $media = Media::create([
            'bundle' => $this->testMediaType
                ->id(),
            'field_media_test' => 'some_value',
        ]);
        $media->save();
        $this->assertEmpty($media->get($field_name)->value, 'Field stayed empty.');
        // Make sure that source plugin returns NULL for non-existing fields.
        $this->testMediaType
            ->setFieldMap([
            'not_here_at_all' => $field_name,
        ])
            ->save();
        $media = Media::create([
            'bundle' => $this->testMediaType
                ->id(),
            'field_media_test' => 'some_value',
        ]);
        $media_source = $media->getSource();
        $this->assertNull($media_source->getMetadata($media, 'not_here_at_all'), 'NULL is not returned if asking for a value of non-existing metadata.');
        $media->save();
        $this->assertTrue($media->get($field_name)
            ->isEmpty(), 'Non-existing metadata attribute was wrongly mapped to the field.');
        // Define mapping and make sure that the value was stored in the field.
        \Drupal::state()->set('media_source_test_attributes', [
            $attribute_name => [
                'title' => 'Attribute to map',
                'value' => 'Snowball',
            ],
        ]);
        $this->testMediaType
            ->setFieldMap([
            $attribute_name => $field_name,
        ])
            ->save();
        $media = Media::create([
            'bundle' => $this->testMediaType
                ->id(),
            'field_media_test' => 'some_value',
        ]);
        $media_source = $media->getSource();
        $this->assertSame('Snowball', $media_source->getMetadata($media, $attribute_name), 'Value of the metadata attribute is not correct.');
        $media->save();
        $this->assertSame('Snowball', $media->get($field_name)->value, 'Metadata attribute was not mapped to the field.');
        // Change the metadata attribute value and re-save the entity. Field value
        // should stay the same.
        \Drupal::state()->set('media_source_test_attributes', [
            $attribute_name => [
                'title' => 'Attribute to map',
                'value' => 'Pinkeye',
            ],
        ]);
        $this->assertSame('Pinkeye', $media_source->getMetadata($media, $attribute_name), 'Value of the metadata attribute is not correct.');
        $media->save();
        $this->assertSame('Snowball', $media->get($field_name)->value, 'Metadata attribute was not mapped to the field.');
        // Now change the value of the source field and make sure that the mapped
        // values update too.
        $this->assertSame('Pinkeye', $media_source->getMetadata($media, $attribute_name), 'Value of the metadata attribute is not correct.');
        $media->set('field_media_test', 'some_new_value');
        $media->save();
        $this->assertSame('Pinkeye', $media->get($field_name)->value, 'Metadata attribute was not mapped to the field.');
        // Remove the value of the mapped field and make sure that it is re-mapped
        // on save.
        \Drupal::state()->set('media_source_test_attributes', [
            $attribute_name => [
                'title' => 'Attribute to map',
                'value' => 'Snowball',
            ],
        ]);
        $media->{$field_name}->value = NULL;
        $this->assertSame('Snowball', $media_source->getMetadata($media, $attribute_name), 'Value of the metadata attribute is not correct.');
        $media->save();
        $this->assertSame('Snowball', $media->get($field_name)->value, 'Metadata attribute was not mapped to the field.');
    }
    
    /**
     * Tests the getSourceFieldValue() method.
     */
    public function testGetSourceFieldValue() {
        
        /** @var \Drupal\media\MediaInterface $media */
        $media = Media::create([
            'bundle' => $this->testMediaType
                ->id(),
            'field_media_test' => 'some_value',
        ]);
        $media->save();
        $media_source = $media->getSource();
        $this->assertSame('some_value', $media_source->getSourceFieldValue($media));
        // Test that NULL is returned if there is no value in the source field.
        $media->set('field_media_test', NULL)
            ->save();
        $this->assertNull($media_source->getSourceFieldValue($media));
    }
    
    /**
     * Tests the thumbnail functionality.
     */
    public function testThumbnail() {
        file_put_contents('public://thumbnail1.jpg', '');
        file_put_contents('public://thumbnail2.jpg', '');
        // Save a media item and make sure thumbnail was added.
        \Drupal::state()->set('media_source_test_attributes', [
            'thumbnail_uri' => [
                'value' => 'public://thumbnail1.jpg',
            ],
        ]);
        
        /** @var \Drupal\media\MediaInterface $media */
        $media = Media::create([
            'bundle' => $this->testMediaType
                ->id(),
            'name' => 'Mr. Jones',
            'field_media_test' => 'some_value',
        ]);
        $media_source = $media->getSource();
        $this->assertSame('public://thumbnail1.jpg', $media_source->getMetadata($media, 'thumbnail_uri'), 'Value of the thumbnail metadata attribute is not correct.');
        $media->save();
        $this->assertSame('public://thumbnail1.jpg', $media->thumbnail->entity
            ->getFileUri(), 'Thumbnail was not added to the media item.');
        // We expect the title not to be present on the Thumbnail.
        $this->assertEmpty($media->thumbnail->title);
        $this->assertSame('', $media->thumbnail->alt);
        // Now change the metadata attribute and make sure that the thumbnail stays
        // the same.
        \Drupal::state()->set('media_source_test_attributes', [
            'thumbnail_uri' => [
                'value' => 'public://thumbnail2.jpg',
            ],
        ]);
        $this->assertSame('public://thumbnail2.jpg', $media_source->getMetadata($media, 'thumbnail_uri'), 'Value of the thumbnail metadata attribute is not correct.');
        $media->save();
        $this->assertSame('public://thumbnail1.jpg', $media->thumbnail->entity
            ->getFileUri(), 'Thumbnail was not preserved.');
        $this->assertEmpty($media->thumbnail->title);
        $this->assertSame('', $media->thumbnail->alt);
        // Remove the thumbnail and make sure that it is auto-updated on save.
        $media->thumbnail->target_id = NULL;
        $this->assertSame('public://thumbnail2.jpg', $media_source->getMetadata($media, 'thumbnail_uri'), 'Value of the thumbnail metadata attribute is not correct.');
        $media->save();
        $this->assertSame('public://thumbnail2.jpg', $media->thumbnail->entity
            ->getFileUri(), 'New thumbnail was not added to the media item.');
        $this->assertEmpty($media->thumbnail->title);
        $this->assertSame('', $media->thumbnail->alt);
        // Change the metadata attribute again, change the source field value too
        // and make sure that the thumbnail updates.
        \Drupal::state()->set('media_source_test_attributes', [
            'thumbnail_uri' => [
                'value' => 'public://thumbnail1.jpg',
            ],
        ]);
        $media->field_media_test->value = 'some_new_value';
        $this->assertSame('public://thumbnail1.jpg', $media_source->getMetadata($media, 'thumbnail_uri'), 'Value of the thumbnail metadata attribute is not correct.');
        $media->save();
        $this->assertSame('public://thumbnail1.jpg', $media->thumbnail->entity
            ->getFileUri(), 'New thumbnail was not added to the media item.');
        $this->assertEmpty($media->thumbnail->title);
        $this->assertSame('', $media->thumbnail->alt);
        // Change the thumbnail metadata attribute and make sure that the thumbnail
        // is set correctly.
        \Drupal::state()->set('media_source_test_attributes', [
            'thumbnail_uri' => [
                'value' => 'public://thumbnail1.jpg',
            ],
            'alternative_thumbnail_uri' => [
                'value' => 'public://thumbnail2.jpg',
            ],
        ]);
        \Drupal::state()->set('media_source_test_definition', [
            'thumbnail_uri_metadata_attribute' => 'alternative_thumbnail_uri',
        ]);
        $media = Media::create([
            'bundle' => $this->testMediaType
                ->id(),
            'name' => 'Mr. Jones',
            'field_media_test' => 'some_value',
        ]);
        $media_source = $media->getSource();
        $this->assertSame('public://thumbnail1.jpg', $media_source->getMetadata($media, 'thumbnail_uri'), 'Value of the metadata attribute is not correct.');
        $this->assertSame('public://thumbnail2.jpg', $media_source->getMetadata($media, 'alternative_thumbnail_uri'), 'Value of the thumbnail metadata attribute is not correct.');
        $media->save();
        $this->assertSame('public://thumbnail2.jpg', $media->thumbnail->entity
            ->getFileUri(), 'Correct metadata attribute was not used for the thumbnail.');
        $this->assertEmpty($media->thumbnail->title);
        $this->assertSame('', $media->thumbnail->alt);
        // Set the width and height metadata attributes and make sure they're used
        // for the thumbnail.
        \Drupal::state()->set('media_source_test_definition', [
            'thumbnail_width_metadata_attribute' => 'width',
            'thumbnail_height_metadata_attribute' => 'height',
        ]);
        \Drupal::state()->set('media_source_test_attributes', [
            'width' => [
                'value' => 1024,
            ],
            'height' => [
                'value' => 768,
            ],
        ]);
        $media = Media::create([
            'bundle' => $this->testMediaType
                ->id(),
            'name' => 'Are you looking at me?',
            'field_media_test' => 'some_value',
        ]);
        $media->save();
        $this->assertSame(1024, $media->thumbnail->width);
        $this->assertSame(768, $media->thumbnail->height);
        // Enable queued thumbnails and make sure that the entity gets the default
        // thumbnail initially.
        \Drupal::state()->set('media_source_test_definition', []);
        \Drupal::state()->set('media_source_test_attributes', [
            'thumbnail_uri' => [
                'value' => 'public://thumbnail1.jpg',
            ],
        ]);
        $this->testMediaType
            ->setQueueThumbnailDownloadsStatus(TRUE)
            ->save();
        $media = Media::create([
            'bundle' => $this->testMediaType
                ->id(),
            'name' => 'Mr. Jones',
            'field_media_test' => 'some_value',
        ]);
        $this->assertSame('public://thumbnail1.jpg', $media->getSource()
            ->getMetadata($media, 'thumbnail_uri'), 'Value of the metadata attribute is not correct.');
        $media->save();
        $this->assertSame('public://media-icons/generic/generic.png', $media->thumbnail->entity
            ->getFileUri(), 'Default thumbnail was not set initially.');
        $this->assertEmpty($media->thumbnail->title);
        $this->assertSame('', $media->thumbnail->alt);
        // Process the queue item and make sure that the thumbnail was updated too.
        $queue_name = 'media_entity_thumbnail';
        
        /** @var \Drupal\Core\Queue\QueueWorkerInterface $queue_worker */
        $queue_worker = \Drupal::service('plugin.manager.queue_worker')->createInstance($queue_name);
        $queue = \Drupal::queue($queue_name);
        $this->assertSame(1, $queue->numberOfItems(), 'Item was not added to the queue.');
        $item = $queue->claimItem();
        $this->assertSame($media->id(), $item->data['id'], 'Queue item that was created does not belong to the correct entity.');
        $queue_worker->processItem($item->data);
        $queue->deleteItem($item);
        $this->assertSame(0, $queue->numberOfItems(), 'Item was not removed from the queue.');
        $media = Media::load($media->id());
        $this->assertSame('public://thumbnail1.jpg', $media->thumbnail->entity
            ->getFileUri(), 'Thumbnail was not updated by the queue.');
        $this->assertEmpty($media->thumbnail->title);
        $this->assertSame('', $media->thumbnail->alt);
        // Set the alt metadata attribute and make sure it's used for the thumbnail.
        \Drupal::state()->set('media_source_test_definition', [
            'thumbnail_alt_metadata_attribute' => 'alt',
        ]);
        \Drupal::state()->set('media_source_test_attributes', [
            'alt' => [
                'value' => 'This will be alt.',
            ],
        ]);
        $media = Media::create([
            'bundle' => $this->testMediaType
                ->id(),
            'name' => 'Boxer',
            'field_media_test' => 'some_value',
        ]);
        $media->save();
        $this->assertSame('Boxer', $media->getName(), 'Correct name was not set on the media item.');
        $this->assertEmpty($media->thumbnail->title);
        $this->assertSame('This will be alt.', $media->thumbnail->alt);
    }
    
    /**
     * Tests the media item constraints functionality.
     */
    public function testConstraints() {
        // Test entity constraints.
        \Drupal::state()->set('media_source_test_entity_constraints', [
            'MediaTestConstraint' => [],
        ]);
        // Create a media item media that uses a source plugin with constraints and
        // make sure the constraints works as expected when validating.
        
        /** @var \Drupal\media\MediaInterface $media */
        $media = Media::create([
            'bundle' => $this->testConstraintsMediaType
                ->id(),
            'name' => 'I do not like Drupal',
            'field_media_test_constraints' => 'Not checked',
        ]);
        // Validate the entity and make sure violation is reported.
        
        /** @var \Drupal\Core\Entity\EntityConstraintViolationListInterface $violations */
        $violations = $media->validate();
        $this->assertCount(1, $violations, 'Expected number of validations not found.');
        $this->assertEquals('Inappropriate text.', $violations->get(0)
            ->getMessage(), 'Incorrect constraint validation message found.');
        // Fix the violation and make sure it is not reported anymore.
        $media->setName('I love Drupal!');
        $violations = $media->validate();
        $this->assertCount(0, $violations, 'Expected number of validations not found.');
        // Save and make sure it succeeded.
        $this->assertEmpty($media->id(), 'Entity ID was found.');
        $media->save();
        $this->assertNotEmpty($media->id(), 'Entity ID was not found.');
        $this->assertSame($media->getName(), 'I love Drupal!');
        // Test source field constraints.
        \Drupal::state()->set('media_source_test_field_constraints', [
            'MediaTestConstraint' => [],
        ]);
        \Drupal::state()->set('media_source_test_entity_constraints', []);
        // Create media that uses source with constraints and make sure it can't
        // be saved without validating them.
        
        /** @var \Drupal\media\MediaInterface $media */
        $media = Media::create([
            'bundle' => $this->testConstraintsMediaType
                ->id(),
            'name' => 'Not checked',
            'field_media_test_constraints' => 'I do not like Drupal',
        ]);
        // Validate the entity and make sure violation is reported.
        
        /** @var \Drupal\Core\Entity\EntityConstraintViolationListInterface $violations */
        $violations = $media->validate();
        $this->assertCount(1, $violations, 'Expected number of validations not found.');
        $this->assertEquals('Inappropriate text.', $violations->get(0)
            ->getMessage(), 'Incorrect constraint validation message found.');
        // Fix the violation and make sure it is not reported anymore.
        $media->set('field_media_test_constraints', 'I love Drupal!');
        $violations = $media->validate();
        $this->assertCount(0, $violations, 'Expected number of validations not found.');
        // Save and make sure it succeeded.
        $this->assertEmpty($media->id(), 'Entity ID was found.');
        $media->save();
        $this->assertNotEmpty($media->id(), 'Entity ID was not found.');
    }
    
    /**
     * Tests logic related to the automated source field creation.
     */
    public function testSourceFieldCreation() {
        
        /** @var \Drupal\media\MediaTypeInterface $type */
        $type = MediaType::create([
            'id' => 'test_type',
            'label' => 'Test type',
            'source' => 'test',
        ]);
        
        /** @var \Drupal\field\Entity\FieldConfig $field */
        $field = $type->getSource()
            ->createSourceField($type);
        
        /** @var \Drupal\field\Entity\FieldStorageConfig $field_storage */
        $field_storage = $field->getFieldStorageDefinition();
        // Test field storage.
        $this->assertTrue($field_storage->isNew(), 'Field storage is saved automatically.');
        $this->assertFalse($field_storage->isLocked(), 'Field storage is not locked.');
        $this->assertSame('string', $field_storage->getType(), 'Field is not of correct type.');
        $this->assertSame('field_media_test_1', $field_storage->getName(), 'Incorrect field name is used.');
        $this->assertSame('media', $field_storage->getTargetEntityTypeId(), 'Field is not targeting media entities.');
        // Test field.
        $this->assertTrue($field->isNew(), 'Field is saved automatically.');
        $this->assertSame('field_media_test_1', $field->getName(), 'Incorrect field name is used.');
        $this->assertSame('string', $field->getType(), 'Field is of incorrect type.');
        $this->assertTrue($field->isRequired(), 'Field is not required.');
        $this->assertEquals('Test source', $field->label(), 'Incorrect label is used.');
        $this->assertSame('test_type', $field->getTargetBundle(), 'Field is not targeting correct bundle.');
        // Fields should be automatically saved only when creating the media type
        // using the media type creation form. Make sure that they are not saved
        // when creating a media type programmatically.
        // Drupal\Tests\media\FunctionalJavascript\MediaTypeCreationTest is testing
        // form part of the functionality.
        $type->save();
        $storage = FieldStorageConfig::load('media.field_media_test_1');
        $this->assertNull($storage, 'Field storage was not saved.');
        $field = FieldConfig::load('media.test_type.field_media_test_1');
        $this->assertNull($field, 'Field storage was not saved.');
        // Test the plugin with a different default source field type.
        $type = MediaType::create([
            'id' => 'test_constraints_type',
            'label' => 'Test type with constraints',
            'source' => 'test_constraints',
        ]);
        $field = $type->getSource()
            ->createSourceField($type);
        $field_storage = $field->getFieldStorageDefinition();
        // Test field storage.
        $this->assertTrue($field_storage->isNew(), 'Field storage is saved automatically.');
        $this->assertFalse($field_storage->isLocked(), 'Field storage is not locked.');
        $this->assertSame('string_long', $field_storage->getType(), 'Field is of incorrect type.');
        $this->assertSame('field_media_test_constraints_1', $field_storage->getName(), 'Incorrect field name is used.');
        $this->assertSame('media', $field_storage->getTargetEntityTypeId(), 'Field is not targeting media entities.');
        // Test field.
        $this->assertTrue($field->isNew(), 'Field is saved automatically.');
        $this->assertSame('field_media_test_constraints_1', $field->getName(), 'Incorrect field name is used.');
        $this->assertSame('string_long', $field->getType(), 'Field is of incorrect type.');
        $this->assertTrue($field->isRequired(), 'Field is not required.');
        $this->assertEquals('Test source with constraints', $field->label(), 'Incorrect label is used.');
        $this->assertSame('test_constraints_type', $field->getTargetBundle(), 'Field is not targeting correct bundle.');
    }
    
    /**
     * Tests configuration form submit handler on the base media source plugin.
     */
    public function testSourceConfigurationSubmit() {
        
        /** @var \Drupal\media\MediaSourceManager $manager */
        $manager = $this->container
            ->get('plugin.manager.media.source');
        $form = [];
        $form_state = new FormState();
        $form_state->setValues([
            'test_config_value' => 'Somewhere over the rainbow.',
        ]);
        
        /** @var \Drupal\media\MediaSourceInterface $source */
        $source = $manager->createInstance('test', []);
        $source->submitConfigurationForm($form, $form_state);
        $expected = [
            'source_field' => 'field_media_test_1',
            'test_config_value' => 'Somewhere over the rainbow.',
        ];
        $this->assertSame($expected, $source->getConfiguration(), 'Submitted values were saved correctly.');
        // Try to save a NULL value.
        $form_state->setValue('test_config_value', NULL);
        $source->submitConfigurationForm($form, $form_state);
        $expected['test_config_value'] = NULL;
        $this->assertSame($expected, $source->getConfiguration(), 'Submitted values were saved correctly.');
        // Make sure that the config keys are determined correctly even if the
        // existing value is NULL.
        $form_state->setValue('test_config_value', 'Somewhere over the rainbow.');
        $source->submitConfigurationForm($form, $form_state);
        $expected['test_config_value'] = 'Somewhere over the rainbow.';
        $this->assertSame($expected, $source->getConfiguration(), 'Submitted values were saved correctly.');
        // Make sure that a non-relevant value will be skipped.
        $form_state->setValue('not_relevant', 'Should not be saved in the plugin.');
        $source->submitConfigurationForm($form, $form_state);
        $this->assertSame($expected, $source->getConfiguration(), 'Submitted values were saved correctly.');
    }
    
    /**
     * Tests different display options for the source field.
     */
    public function testDifferentSourceFieldDisplays() {
        $id = 'test_different_displays';
        $field_name = 'field_media_different_display';
        $this->createMediaTypeViaForm($id, $field_name);
        // Source field not in displays.
        $display = \Drupal::service('entity_display.repository')->getViewDisplay('media', $id);
        $components = $display->getComponents();
        $this->assertArrayHasKey($field_name, $components);
        $this->assertSame('entity_reference_entity_id', $components[$field_name]['type']);
        $display = \Drupal::service('entity_display.repository')->getFormDisplay('media', $id);
        $components = $display->getComponents();
        $this->assertArrayHasKey($field_name, $components);
        $this->assertSame('entity_reference_autocomplete_tags', $components[$field_name]['type']);
    }
    
    /**
     * Tests hidden source field in media type.
     */
    public function testHiddenSourceField() {
        $id = 'test_hidden_source_field';
        $field_name = 'field_media_hidden';
        $this->createMediaTypeViaForm($id, $field_name);
        // Source field not in displays.
        $display = \Drupal::service('entity_display.repository')->getViewDisplay('media', $id);
        $this->assertArrayNotHasKey($field_name, $display->getComponents());
        $display = \Drupal::service('entity_display.repository')->getFormDisplay('media', $id);
        $this->assertArrayNotHasKey($field_name, $display->getComponents());
    }
    
    /**
     * Creates a media type via form submit.
     *
     * @param string $source_plugin_id
     *   Source plugin ID.
     * @param string $field_name
     *   Source field name.
     */
    protected function createMediaTypeViaForm($source_plugin_id, $field_name) {
        
        /** @var \Drupal\media\MediaTypeInterface $type */
        $type = MediaType::create([
            'source' => $source_plugin_id,
        ]);
        $form = $this->container
            ->get('entity_type.manager')
            ->getFormObject('media_type', 'add')
            ->setEntity($type);
        $form_state = new FormState();
        $form_state->setValues([
            'label' => 'Test type',
            'id' => $source_plugin_id,
            'op' => 'Save',
        ]);
        
        /** @var \Drupal\Core\Entity\EntityFieldManagerInterface $field_manager */
        $field_manager = \Drupal::service('entity_field.manager');
        // Source field not created yet.
        $fields = $field_manager->getFieldDefinitions('media', $source_plugin_id);
        $this->assertArrayNotHasKey($field_name, $fields);
        \Drupal::formBuilder()->submitForm($form, $form_state);
        // Source field exists now.
        $fields = $field_manager->getFieldDefinitions('media', $source_plugin_id);
        $this->assertArrayHasKey($field_name, $fields);
    }

}