Improve tests
- ensure the actual values (sha1 and path) are correct instead of just counting the rows in the database,
- rename test_provenance_db() as test_probenance_heuristics()
- rename synthetic result test files
including both heuristic 'arguments' in the file name, aka:
- synthetic_noroot_upper.txt -> synthetic_upper_1.txt
- synthetic_noroot_lower.txt -> synthetic_lower_1.txt
- add synthetic test files for the mindepth=2 heuristic
Depends on !13 (closed)
Migrated from D5389 (view on Phabricator)