Add tests

[mikegerber]

To continue developing this, I need basic tests.

• Reuse the tests from ocrd_calamari (do not check the generated Unicode line text for now)
• Upload the highly experimental TrOCR-GT4HistOCR model for testing and check the result

[mikegerber]

Considering not having any basic automatic tests a bug at this point.

[mikegerber]

Basic test is in with 9ef8c13

[mikegerber]

CircleCI tests are now in place.

It fails for all Python versions except the one I was developing on 😝

[mikegerber]

https://app.circleci.com/pipelines/github/qurator-spk/ocrd_trocr/5/workflows/56f8d3ca-59df-458c-b8cd-d1254b47b5c0

• 3.11: fails to install sentencepiece
• 3.10: timeout
• 3.9: OK
• 3.8: timeout
• 3.7: timeout

On my system (a server with considerable CPU resources), the tests or coverage runs <40s wall time, but with >600s CPU time, so this may be the problem.

[mikegerber]

After increasing the timeout, Python 3.7 to 3.9 ran within ~ 3m (?) and 3.10 is still running after 25m... Needs more investigation, may just be random load fluctuation at CircleCI, but I have doubts as 3.9 (my test version) has always been fastest.

[mikegerber]

Python 3.11 is fixed now by installing cmake, as sentencepiece is built from source there.

Now the test runs from Python 3.7 to Python 3.11 🍾

[mikegerber]

Runtime varies from run to run, probably a CircleCI issue. Not going to bother with this, as long as the tests finish.

[mikegerber]

3.7, 3.10, 3.11 are OK with the latest build, 3.8, 3.9 fail...