in-toto / demo

The demo tests compare expected output to actual output of a demo run. If they differ, tests fail and both outputs are printed one after the other:

demo/run_demo_md.py

Lines 123 to 126 in 14d2558

    
           if stdout != EXPECTED_STDOUT: 
        
             raise SystemExit( 
        
                 "#### EXPECTED:\n-\n{}\n-\n#### GOT:\n-\n{}\n-\nDemo test failed due " 
        
                 "to unexpected output (see above). :(".format(EXPECTED_STDOUT, stdout))

In order to more easily identify test failure reasons, it would be great to show something like a line diff of the outputs. Python's difflib should be able to do this.

Nicely addressed by @SolidifiedRay in #17.

	if stdout != EXPECTED_STDOUT:
	raise SystemExit(
	"#### EXPECTED:\n-\n{}\n-\n#### GOT:\n-\n{}\n-\nDemo test failed due "
	"to unexpected output (see above). :(".format(EXPECTED_STDOUT, stdout))

Show output diff for test failures