TST: adds tests for unary ops on Period

Author: deniederhut

pandas/tests/frame/test_operators.py

@@ -276,7 +276,9 @@ def test_logical_with_nas(self):
         (pd.DataFrame({'a': [False, True]}),
             pd.DataFrame({'a': [True, False]})),
         (pd.DataFrame({'a': pd.Series(pd.to_timedelta([-1, 1]))}),
-            pd.DataFrame({'a': pd.Series(pd.to_timedelta([1, -1]))}))
+            pd.DataFrame({'a': pd.Series(pd.to_timedelta([1, -1]))})),
+        (pd.DataFrame({'a': [pd.Period('4Q2005'), pd.Period('3Q2005')]}),
+            pd.DataFrame({'a': [-4, -3]}, dtype='object'))
     ])
     def test_neg_numeric(self, df, expected):
         assert_frame_equal(-df, expected)
@@ -307,7 +309,7 @@ def test_pos_numeric(self, df):
 
     @pytest.mark.parametrize('df', [
         pd.DataFrame({'a': ['a', 'b']}),
-        pd.DataFrame({'a': pd.to_datetime(['2017-01-22', '1970-01-01'])}),
+        pd.DataFrame({'a': pd.to_datetime(['2017-01-22', '1970-01-01'])})
     ])
     def test_pos_raises(self, df):
         with pytest.raises(TypeError):