':return: ImagePipeline class will all uppercase attributes set.'

def _generate_fake_pipeline_subclass(self):

    class UserDefinedImagePipeline(ImagesPipeline, ):
        MIN_WIDTH = random.randint(1000, 2000)
        MIN_HEIGHT = random.randint(1000, 2000)
        THUMBS = {'small': (random.randint(1000, 2000), random.randint(1000, 2000)), 'big': (random.randint(1000, 2000), random.randint(1000, 2000))}
        EXPIRES = random.randint(1000, 2000)
        IMAGES_URLS_FIELD = 'field_one'
        IMAGES_RESULT_FIELD = 'field_two'
    return UserDefinedImagePipeline
