Test - Add unit tests for filtering operators #135
Description
Is your feature request related to a problem?
There are no unit tests for the filtering operators (BilateralFilter, BoxFilter, Sharpen, Erosion, Dilation, Morphological, PyramidUp, PyramidDown). Without tests, regressions in these operators can go undetected, for example, incorrect RGBA handling, wrong output dtype, or broken parameter defaults.
Describe the solution you'd like
Add tests/test_filtering_operators.py to cover the unit tests for the filtering operators.