TST: changed test_factor -> test_categorical

Author: jreback

pandas/tests/test_factor.py renamed to pandas/tests/test_categorical.py

@@ -10,7 +10,6 @@
 import numpy as np
 from numpy.testing import assert_array_equal
 
-from pandas.core.categorical import Factor
 from pandas.core.index import Index, Int64Index, MultiIndex
 from pandas.util.testing import assert_almost_equal
 from pandas.util import py3compat