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This PR makes
mypy
an optional dependency for themypy
tests.This might seem like an odd thing to do, but some test runners (notably
pytest
) will discover those tests. Ifpytest
is run on a clean Python environment with a freshly-installed Traits, then it should gracefully skip the tests for which the dependencies aren't installed. We already do this for Sphinx, numpy, and various other packages.Related: #1288