Create tests for SFFL

[gruberma]

Basically automate the tests described in the README.

For step 1 (running): check if sqlites are being created (not directly, but indirectly by asserting, if we can derive a coverage table (CTA))
For steps 2 and 3: save an existing ResultsDir as a test_resource and apply the parsing steps to it.

I would keep these two parts separate, otherwise the test might become flaky ;-)