CI: refactoring tests #28
Description
Context: we had a lot of tests that were running too long, and had random results (due to the fact that at each run we had different samples on which estimators were tested). Now, we use @mark.ci to mark tests that should be running on CI, and most tests do not have this mark.
We should turn some of these tests into regression tests by fixing seed (without marking them as CI), some of them should be removed, and we need additional tests for args validation and edge-cases:
So, we have to:
- add args validation tests
- add tests for boundary cases
- add regression tests