def test_image_class(self):
"""Test the Image class."""
image = Image(id='The hash id')
with open("oppia/tests/data/img.png") as f:
image_file = File(f)
image_file_content = f.read()
image.raw = image_file
image.save()
# Retrieve the image.
retrieved_image = Image.objects.get(id='The hash id')
# Read its content
retrieved_content = retrieved_image.raw.read()
self.assertEqual(retrieved_content, image_file_content)
