Add GH issue number

Author: kotamatsuoka

pandas/tests/resample/test_datetime_index.py

@@ -538,6 +538,7 @@ def test_upsample_with_limit():
 @pytest.mark.parametrize("freq", ["Y", "10M", "5D", "10H", "5Min", "10S"])
 @pytest.mark.parametrize("rule", ["Y", "3M", "15D", "30H", "15Min", "30S"])
 def test_nearest_upsample_with_limit(tz_aware_fixture, freq, rule):
+    # GH 33939
     rng = date_range("1/1/2000", periods=3, freq=freq, tz=tz_aware_fixture)
     ts = Series(np.random.randn(len(rng)), rng)