move specific tests for a particular learner to separate files
and rename test_learner.py -> test_learners.py.
We leave tests that are general (apply to multiple learners) in test_learners.py.
Edited by Bas Nijholt
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and rename test_learner.py -> test_learners.py.
We leave tests that are general (apply to multiple learners) in test_learners.py.