Fix oversights

Author: h-vetinari

pandas/tests/frame/test_api.py

@@ -349,7 +349,7 @@ def test_axis_aliases(self, float_frame):
         tm.assert_series_equal(result, expected)
 
     def test_class_axis(self):
-        # https://github.com/pandas-dev/pandas/issues/18147
+        # GH 18147
         # no exception and no empty docstring
         assert pydoc.getdoc(DataFrame.index)
         assert pydoc.getdoc(DataFrame.columns)
@@ -498,7 +498,7 @@ def _check_f(base, f):
         _check_f(d.copy(), f)
 
     def test_tab_complete_warning(self, ip):
-        # https://github.com/pandas-dev/pandas/issues/16409
+        # GH 16409
         pytest.importorskip('IPython', minversion="6.0.0")
         from IPython.core.completer import provisionalcompleter
 

pandas/tests/frame/test_apply.py

@@ -883,7 +883,7 @@ def f():
         'abs', 'shift', 'pct_change', 'cumsum', 'rank',
     ])
     def test_transform_method_name(self, method):
-        # https://github.com/pandas-dev/pandas/issues/19760
+        # GH 19760
         df = DataFrame({"A": [-1, 2]})
         result = df.transform(method)
         expected = operator.methodcaller(method)(df)
@@ -907,7 +907,7 @@ def test_demo(self):
         tm.assert_frame_equal(result.reindex_like(expected), expected)
 
     def test_agg_multiple_mixed_no_warning(self):
-        # https://github.com/pandas-dev/pandas/issues/20909
+        # GH 20909
         mdf = DataFrame({'A': [1, 2, 3],
                          'B': [1., 2., 3.],
                          'C': ['foo', 'bar', 'baz'],