No tests.

[ndobromirov]

The tool is starting to collect functionality, but there are no automated tests for it.

[mikehaertl]

@ndobromirov That's right. Feel free to add something. Only guidelines: I prefer simple solutions. If I had time I'd probaly use our dockerized yii2 app. Just not sure how to best integrate this with tests in travis or how to check for stdout / stderr. Before you spend too much time, maybe we can first discuss the approach here.