fix RawKernel bug for canny filter when quantiles are used #310
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This PR fixes a bug in
canny
that was leading to failures intest_use_quantiles
. It also expands that test case viapytest.parametrize
to cover additional dtypesThe changes to other test classes are merely refactoring to avoid use of
unittest.TestCase
so thatpytest.parametrize
can be used