Add more tests with multiple levels of transitive dependencies

[sschuberth]

Even the "complex" text workflow is rather simple in the sense that the dependency hierarchy is not very deep. Please add more test with deeper dependency hierarchies, and edge-cases like cyclic dependencies.

[sschuberth]

Also an example for a "compromised" action would be nice.

[sschuberth]

Also an example for a "compromised" action would be nice.

See #13.