Fix test suite use of str(exception)

doc/whats-new.rst

@@ -120,12 +120,9 @@ Bug fixes
   By `Maximilian Roos <https://github.com/max-sixty>`_.
 - Fixed performance issues with cftime installed (:issue:`3000`)
   By `0x0L <https://github.com/0x0L>`_.
-- Replace incorrect usages of `message` in pytest assertions
-  with `match` (:issue:`3011`)
-  By `Maximilian Roos <https://github.com/max-sixty>`_.
-- Add explicit pytest markers, now required by pytest
-  (:issue:`3032`).
-  By `Maximilian Roos <https://github.com/max-sixty>`_.
+- Test suite fixes for newer versions of pytest (:issue:`3011`, :issue:`3032`).
+  By `Maximilian Roos <https://github.com/max-sixty>`_
+  and `Stephan Hoyer <https://github.com/shoyer>`_.
 
 .. _whats-new.0.12.1:
 

xarray/tests/test_dataarray.py

@@ -3710,15 +3710,14 @@ def test_rolling_properties(da):
     assert rolling_obj.obj.get_axis_num('time') == 1
 
     # catching invalid args
-    with pytest.raises(ValueError) as exception:
+    with pytest.raises(ValueError, match='exactly one dim/window should'):
         da.rolling(time=7, x=2)
-    assert 'exactly one dim/window should' in str(exception)
-    with pytest.raises(ValueError) as exception:
+    with pytest.raises(ValueError, match='window must be > 0'):
         da.rolling(time=-2)
-    assert 'window must be > 0' in str(exception)
-    with pytest.raises(ValueError) as exception:
+    with pytest.raises(
+        ValueError, match='min_periods must be greater than zero'
+    ):
         da.rolling(time=2, min_periods=0)
-    assert 'min_periods must be greater than zero' in str(exception)
 
 
 @pytest.mark.parametrize('name', ('sum', 'mean', 'std', 'min', 'max',

xarray/tests/test_dataset.py

@@ -4788,18 +4788,16 @@ def test_coarsen_coords_cftime():
 
 def test_rolling_properties(ds):
     # catching invalid args
-    with pytest.raises(ValueError) as exception:
+    with pytest.raises(ValueError, match='exactly one dim/window should'):
         ds.rolling(time=7, x=2)
-    assert 'exactly one dim/window should' in str(exception)
-    with pytest.raises(ValueError) as exception:
+    with pytest.raises(ValueError, match='window must be > 0'):
         ds.rolling(time=-2)
-    assert 'window must be > 0' in str(exception)
-    with pytest.raises(ValueError) as exception:
+    with pytest.raises(
+        ValueError, match='min_periods must be greater than zero'
+    ):
         ds.rolling(time=2, min_periods=0)
-    assert 'min_periods must be greater than zero' in str(exception)
-    with pytest.raises(KeyError) as exception:
+    with pytest.raises(KeyError, match='time2'):
         ds.rolling(time2=2)
-    assert 'time2' in str(exception)
 
 
 @pytest.mark.parametrize('name',