drupalGetTestFiles('image'))); // Create derivative image. $styles = ImageStyle::loadMultiple(); $style = reset($styles); $original_uri = $file->getFileUri(); $derivative_uri = $style->buildUri($original_uri); $style->createDerivative($original_uri, $derivative_uri); // Check if derivative image exists. $this->assertTrue(file_exists($derivative_uri), 'Make sure derivative image is generated successfully.'); // Clone the object so we don't have to worry about the function changing // our reference copy. $desired_filepath = 'public://' . $this->randomMachineName(); $result = file_move(clone $file, $desired_filepath, FILE_EXISTS_ERROR); // Check if image has been moved. $this->assertTrue(file_exists($result->getFileUri()), 'Make sure image is moved successfully.'); // Check if derivative image has been flushed. $this->assertFalse(file_exists($derivative_uri), 'Make sure derivative image has been flushed.'); } }