function testLetterboxImageDeletion()
{
if (!extension_loaded('gd')) {
self::markTestSkipped('Letterbox image test requires GD extension');
}
$data = array();
$file = self::copyTestImage('city-museum.jpg');
$upload_dir = wp_upload_dir();
$data['test_image'] = $upload_dir['url'] . '/city-museum.jpg';
$new_file = TimberImageHelper::letterbox($data['test_image'], 500, 500, '#00FF00');
$letterboxed_file = TimberImageHelper::get_letterbox_file_path($data['test_image'], 500, 500, '#00FF00');
$this->assertFileExists($letterboxed_file);
//Now delete the "parent" image
TimberImageHelper::delete_generated_files($file);
//Have the children been deleted as well?
$this->assertFileNotExists($letterboxed_file);
}