Combo resample/groupby test

Author: dcherian

xarray/tests/test_groupby.py

@@ -18,6 +18,7 @@
     BinGrouper,
     EncodedGroups,
     Grouper,
+    TimeResampler,
     UniqueGrouper,
 )
 from xarray.tests import (
@@ -2693,3 +2694,14 @@ def test_weather_data_resample(use_flox):
     with xr.set_options(use_flox=use_flox):
         actual = ds.resample(time="1MS").mean()
     assert "location" in actual._indexes
+
+    gb = ds.groupby(time=TimeResampler(freq="1MS"), location=UniqueGrouper())
+    with xr.set_options(use_flox=use_flox):
+        actual = gb.mean()
+        expected = ds.resample(time="1MS").mean().sortby("location")
+    assert_allclose(actual, expected)
+    assert actual.time.attrs == ds.time.attrs
+    assert actual.location.attrs == ds.location.attrs
+
+    assert expected.time.attrs == ds.time.attrs
+    assert expected.location.attrs == ds.location.attrs