TST: Use pytest.warns() for warnings, and .raises() for exceptions #1325
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Replace the warning-as-exception checks with use of
pytest.warns()
that is more semantically correct and works correctly when the tests
are run without -Werror (e.g. because -Werror tends to cause test suites
to crash on irrelevant deprecation warnings from other components).
While at it, replace the homegrown exception checks in test_orientations
with
pytest.raises()
.