class ToolkitTestBase

abstract class ToolkitTestBase extends BrowserTestBase {
    use TestFileCreationTrait {
        getTestFiles as drupalGetTestFiles;
    }
    
    /**
     * Modules to enable.
     *
     * @var array
     */
    protected static $modules = [
        'image_test',
    ];
    
    /**
     * The URI for the file.
     *
     * @var string
     */
    protected $file;
    
    /**
     * The image factory service.
     *
     * @var \Drupal\Core\Image\ImageFactory
     */
    protected $imageFactory;
    
    /**
     * The image object for the test file.
     *
     * @var \Drupal\Core\Image\ImageInterface
     */
    protected $image;
    
    /**
     * {@inheritdoc}
     */
    protected function setUp() {
        parent::setUp();
        // Set the image factory service.
        $this->imageFactory = $this->container
            ->get('image.factory');
        // Pick a file for testing.
        $file = current($this->drupalGetTestFiles('image'));
        $this->file = $file->uri;
        // Setup a dummy image to work with.
        $this->image = $this->getImage();
        // Clear out any hook calls.
        $this->imageTestReset();
    }
    
    /**
     * Sets up an image with the custom toolkit.
     *
     * @return \Drupal\Core\Image\ImageInterface
     *   The image object.
     */
    protected function getImage() {
        $image = $this->imageFactory
            ->get($this->file, 'test');
        $this->assertTrue($image->isValid(), 'Image file was parsed.');
        return $image;
    }
    
    /**
     * Tests that only allowed image toolkit operations are called.
     *
     * @param $expected
     *   Array with string containing with the operation name, e.g. 'load',
     *   'save', 'crop', etc.
     */
    public function assertToolkitOperationsCalled(array $expected) {
        // If one of the image operations is expected, apply should be expected as
        // well.
        $operations = [
            'resize',
            'rotate',
            'crop',
            'desaturate',
            'create_new',
            'scale',
            'scale_and_crop',
            'my_operation',
            'convert',
        ];
        if (count(array_intersect($expected, $operations)) > 0 && !in_array('apply', $expected)) {
            $expected[] = 'apply';
        }
        // Determine which operations were called.
        $actual = array_keys(array_filter($this->imageTestGetAllCalls()));
        // Determine if there were any expected that were not called.
        $uncalled = array_diff($expected, $actual);
        if (count($uncalled)) {
            $this->assertTrue(FALSE, new FormattableMarkup('Expected operations %expected to be called but %uncalled was not called.', [
                '%expected' => implode(', ', $expected),
                '%uncalled' => implode(', ', $uncalled),
            ]));
        }
        else {
            $this->assertTrue(TRUE, new FormattableMarkup('All the expected operations were called: %expected', [
                '%expected' => implode(', ', $expected),
            ]));
        }
        // Determine if there were any unexpected calls.
        // If all unexpected calls are operations and apply was expected, we do not
        // count it as an error.
        $unexpected = array_diff($actual, $expected);
        if (count($unexpected) && (!in_array('apply', $expected) || count(array_intersect($unexpected, $operations)) !== count($unexpected))) {
            $this->assertTrue(FALSE, new FormattableMarkup('Unexpected operations were called: %unexpected.', [
                '%unexpected' => implode(', ', $unexpected),
            ]));
        }
        else {
            $this->assertTrue(TRUE, 'No unexpected operations were called.');
        }
    }
    
    /**
     * Resets/initializes the history of calls to the test toolkit functions.
     */
    protected function imageTestReset() {
        // Keep track of calls to these operations
        $results = [
            'parseFile' => [],
            'save' => [],
            'settings' => [],
            'apply' => [],
            'resize' => [],
            'rotate' => [],
            'crop' => [],
            'desaturate' => [],
            'create_new' => [],
            'scale' => [],
            'scale_and_crop' => [],
            'convert' => [],
        ];
        \Drupal::state()->set('image_test.results', $results);
    }
    
    /**
     * Gets an array of calls to the test toolkit.
     *
     * @return array
     *   An array keyed by operation name ('parseFile', 'save', 'settings',
     *   'resize', 'rotate', 'crop', 'desaturate') with values being arrays of
     *   parameters passed to each call.
     */
    protected function imageTestGetAllCalls() {
        return \Drupal::state()->get('image_test.results', []);
    }

}