Expand TEST_SCOPE to include test_fill.py

Author: ndgrigorian

.github/workflows/conda-package.yml

@@ -29,6 +29,7 @@ env:
       test_copy.py
       test_counting.py
       test_fft.py
+      test_fill.py
       test_flat.py
       test_histogram.py
       test_indexing.py