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DEPR: deprecate cols / change to subset in duplicated/drop_duplicates #6680
referenced this issue
Mar 22, 2014
In working on this, the only unit tests I could find for duplicated where in pandas/tseries/tests/test_timeseries.py. Shouldn't there be some tests in pandas/tests/test_frame.py? Regardless, where would you like to see the unit test the verifies the warnings are errors are raised as expected?