Troubleshooting failing transformer tests is difficult

[major]

I was trying to go through and simplify some code, but I ended up with failing tests which were difficult to diagnose:

runner = <click.testing.CliRunner object at 0x7f3e770e9110>, tmp_path = PosixPath('/tmp/pytest-of-major/pytest-0/popen-gw0/test_all0')

    def test_all(runner, tmp_path):
        """Run transformer end to end and generate a list with all image
        details."""
        result = runner.invoke(
            transformer.run,
            [
                "-f",
                "tests/transformer/testdata/input/raw/google/all.json,tests/transformer/testdata/input/raw/aws/af-south-1.json,tests/transformer/testdata/input/raw/azure/eastus.json",
                "-op=.",
                f"-dp={tmp_path}",
                "--filter.until=none",
            ],
        )
    
        assert result.exit_code == 0, (
            f"expected no error, but got code {result.exit_code} and"
            f" output:\n{result.output}"
        )
    
        # Get current directory
        pwd = os.getcwd()
    
        # Check image data by comparing the expected file and the output file byte by byte.
>       assert filecmp.cmp(
            f"{pwd}/tests/transformer/testdata/expected/v2/all",
            f"{tmp_path}/v2/all",
        )
E       AssertionError: assert False
E        +  where False = <function cmp at 0x7f3e77209580>('/home/major/git/redhatcloudx/transformer/tests/transformer/testdata/expected/v2/all', '/tmp/pytest-of-major/pytest-0/popen-gw0/test_all0/v2/all')
E        +    where <function cmp at 0x7f3e77209580> = filecmp.cmp

tests/transformer/test_all.py:31: AssertionError

It's not clear what isn't the same between these two files. I can run diff on both files mentioned, but then I need to also pretty print the JSON output to figure out what is missing.