TST: local test failures
Turning this into a tracker since more are turning up;.

- [ ] api.test_api.test_api (much less frequently than the others) (OSX, Ubuntu)
- [x] frame.test_constructors.TestDataFrameConstructors.test_constructor_maskedrecarray_dtype (AttributeError: module 'numpy.ma' has no attribute 'mrecords', using numpy 1.16.4) (fixed in #26975)
- [x] frame.test_constructors.TestDataFrameConstructors.test_constructor_mrecarray (AttributeError: module 'numpy.ma' has no attribute 'mrecords', using numpy 1.16.4) (fixed in #26975)
- [x] series.indexing.test_datetime.test_index_unique (OSX) (fixed by #27004)
- [ ] resample.test_resample_api.test_select_bad_cols
- [ ] io.formats.test_format.TestDataFrameFormatting.test_repr_html_long_multiindex
- [ ] io.formats.test_format.TestDataFrameFormatting.test_info_repr_html
