Comment by gbro3n

This is more of an integration test than a unit test. And if you're going to test for a pixel perfect image match, why not check for full equality with a pre-existing PDF file, byte for byte? And then what are you testing? That something has changed? You'd likely know that the output was going to change, so to fix the broken test you need to use the failure result to create the new comparison file, and if your always going to use the failure output as an input for correcting the test, what is the point. "Don't test that the code is like the code" is a similar principle.