Checking ansi-color filter function is being applied

[domtronn]

I'm looking at refactoring the code to use start-process-shell-command rather than async-shell-command like we mentioned (see process-refactor), and I'm adding in a filter function to apply ansi colors to the process buffer got a test around it here but can't get it to pass...

It's definitely being called, I've tested it manually and it's working, but looks like the process isn't streaming anything... Perhaps because the grunt task being executed doesn't do anything? I'm not sure...