assertEquals(directive.imagePath, "../sprite.jpgx");
assertEquals(directive.format, SpriteImageDirective.SpriteImageFormat.PNG);
assertEquals(directive.layout, SpriteImageDirective.SpriteImageLayout.VERTICAL);
assertThat(messages).isEquivalentTo(
new Message(Message.MessageLevel.WARN,
Message.MessageType.UNSUPPORTED_SPRITE_IMAGE_FORMAT, null, 0, "jpgx"));
}