class EntityReferenceFileUploadTest

class EntityReferenceFileUploadTest extends BrowserTestBase {
    use TestFileCreationTrait;
    
    /**
     * {@inheritdoc}
     */
    protected static $modules = [
        'node',
        'file',
    ];
    
    /**
     * {@inheritdoc}
     */
    protected $defaultTheme = 'stark';
    
    /**
     * The name of a content type that will reference $referencedType.
     *
     * @var string
     */
    protected $referencingType;
    
    /**
     * The name of a content type that will be referenced by $referencingType.
     *
     * @var string
     */
    protected $referencedType;
    
    /**
     * Node id.
     *
     * @var int
     */
    protected $nodeId;
    
    /**
     * {@inheritdoc}
     */
    protected function setUp() : void {
        parent::setUp();
        // Create "referencing" and "referenced" node types.
        $referencing = $this->drupalCreateContentType();
        $this->referencingType = $referencing->id();
        $referenced = $this->drupalCreateContentType();
        $this->referencedType = $referenced->id();
        $this->nodeId = $this->drupalCreateNode([
            'type' => $referenced->id(),
        ])
            ->id();
        FieldStorageConfig::create([
            'field_name' => 'test_field',
            'entity_type' => 'node',
            'translatable' => FALSE,
            'entity_types' => [],
            'settings' => [
                'target_type' => 'node',
            ],
            'type' => 'entity_reference',
            'cardinality' => FieldStorageDefinitionInterface::CARDINALITY_UNLIMITED,
        ])->save();
        FieldConfig::create([
            'label' => 'Entity reference field',
            'field_name' => 'test_field',
            'entity_type' => 'node',
            'required' => TRUE,
            'bundle' => $referencing->id(),
            'settings' => [
                'handler' => 'default',
                'handler_settings' => [
                    // Reference a single vocabulary.
'target_bundles' => [
                        $referenced->id(),
                    ],
                ],
            ],
        ])
            ->save();
        // Create a file field.
        $file_field_name = 'file_field';
        $field_storage = FieldStorageConfig::create([
            'field_name' => $file_field_name,
            'entity_type' => 'node',
            'type' => 'file',
        ]);
        $field_storage->save();
        FieldConfig::create([
            'entity_type' => 'node',
            'field_storage' => $field_storage,
            'bundle' => $referencing->id(),
            'label' => $this->randomMachineName() . '_label',
        ])
            ->save();
        
        /** @var \Drupal\Core\Entity\EntityDisplayRepositoryInterface $display_repository */
        $display_repository = \Drupal::service('entity_display.repository');
        $display_repository->getViewDisplay('node', $referencing->id())
            ->setComponent('test_field')
            ->setComponent($file_field_name)
            ->save();
        $display_repository->getFormDisplay('node', $referencing->id())
            ->setComponent('test_field', [
            'type' => 'entity_reference_autocomplete',
        ])
            ->setComponent($file_field_name, [
            'type' => 'file_generic',
        ])
            ->save();
    }
    
    /**
     * Tests that the autocomplete input element does not cause ajax fatal.
     */
    public function testFileUpload() : void {
        $user1 = $this->drupalCreateUser([
            'access content',
            "create {$this->referencingType} content",
        ]);
        $this->drupalLogin($user1);
        $test_file = current($this->getTestFiles('text'));
        $edit['files[file_field_0]'] = \Drupal::service('file_system')->realpath($test_file->uri);
        $this->drupalGet('node/add/' . $this->referencingType);
        $this->submitForm($edit, 'Upload');
        $this->assertSession()
            ->statusCodeEquals(200);
        $edit = [
            'title[0][value]' => $this->randomMachineName(),
            'test_field[0][target_id]' => $this->nodeId,
        ];
        $this->submitForm($edit, 'Save');
        $this->assertSession()
            ->statusCodeEquals(200);
    }

}