Replace test classes with Flow equivalences.
Migrate test classes into `Tests/` directory.
Improve test file path generation.
Merge pull request #35 from martin-helmich/bug-handle-test-classes

Respect test classes during migration
Merge remote-tracking branch 'upstream/master' into feature-doctrine-keep

* upstream/master:
  Improve test file path generation.
  Migrate test classes into `Tests/` directory.
  Replace test classes with Flow equivalences.