public function testPassthru()
{
$source = fopen("{$this->_files}/image_png.png", 'r');
$target = fopen('php://temp', 'wb');
$subject = new Imagick($source);
$subject->passthru('setFormat', 'jpeg');
$result = $subject->store($target);
$this->assertTrue($result);
$this->assertEquals('image/jpeg', Type::guessType($target));
fclose($source);
fclose($target);
}
