TST: Assert msg with pytest raises in pandas/tests/extension/base (pandas-dev#38232)

Author: Mark Graham

pandas/tests/extension/base/getitem.py

@@ -160,11 +160,12 @@ def test_getitem_mask(self, data):
 
     def test_getitem_mask_raises(self, data):
         mask = np.array([True, False])
-        with pytest.raises(IndexError):
+        msg = f"Boolean index has wrong length: 2 instead of {len(data)}"
+        with pytest.raises(IndexError, match=msg):
             data[mask]
 
         mask = pd.array(mask, dtype="boolean")
-        with pytest.raises(IndexError):
+        with pytest.raises(IndexError, match=msg):
             data[mask]
 
     def test_getitem_boolean_array_mask(self, data):
@@ -305,7 +306,9 @@ def test_take_empty(self, data, na_value, na_cmp):
         result = empty.take([-1], allow_fill=True)
         assert na_cmp(result[0], na_value)
 
-        with pytest.raises(IndexError):
+        msg = "cannot do a non-empty take from an empty axes|out of bounds"
+
+        with pytest.raises(IndexError, match=msg):
             empty.take([-1])
 
         with pytest.raises(IndexError, match="cannot do a non-empty take"):
@@ -330,13 +333,14 @@ def test_take_non_na_fill_value(self, data_missing):
         self.assert_extension_array_equal(result, expected)
 
     def test_take_pandas_style_negative_raises(self, data, na_value):
-        with pytest.raises(ValueError):
+        with pytest.raises(ValueError, match=""):
             data.take([0, -2], fill_value=na_value, allow_fill=True)
 
     @pytest.mark.parametrize("allow_fill", [True, False])
     def test_take_out_of_bounds_raises(self, data, allow_fill):
         arr = data[:3]
-        with pytest.raises(IndexError):
+
+        with pytest.raises(IndexError, match="out of bounds|out-of-bounds"):
             arr.take(np.asarray([0, 3]), allow_fill=allow_fill)
 
     def test_take_series(self, data):

pandas/tests/extension/base/reduce.py

@@ -28,15 +28,25 @@ def test_reduce_series_numeric(self, data, all_numeric_reductions, skipna):
         op_name = all_numeric_reductions
         s = pd.Series(data)
 
-        with pytest.raises(TypeError):
+        msg = (
+            "[Cc]annot perform|Categorical is not ordered for operation|"
+            "'Categorical' does not implement reduction|"
+        )
+
+        with pytest.raises(TypeError, match=msg):
             getattr(s, op_name)(skipna=skipna)
 
     @pytest.mark.parametrize("skipna", [True, False])
     def test_reduce_series_boolean(self, data, all_boolean_reductions, skipna):
         op_name = all_boolean_reductions
         s = pd.Series(data)
 
-        with pytest.raises(TypeError):
+        msg = (
+            "[Cc]annot perform|Categorical is not ordered for operation|"
+            "'Categorical' does not implement reduction|"
+        )
+
+        with pytest.raises(TypeError, match=msg):
             getattr(s, op_name)(skipna=skipna)