TST: add message matches to pytest.raises in various tests GH30999 (#38350)

Author: JoseNavy

pandas/tests/io/pytables/test_complex.py

@@ -149,17 +149,34 @@ def test_complex_indexing_error(setup_path):
  {"A": [1, 2, 3, 4], "B": ["a", "b", "c", "d"], "C": complex128},
  index=list("abcd"),
  )
+
+ msg = (
+ "Columns containing complex values can be stored "
+ "but cannot be indexed when using table format. "
+ "Either use fixed format, set index=False, "
+ "or do not include the columns containing complex "
+ "values to data_columns when initializing the table."
+ )
+
  with ensure_clean_store(setup_path) as store:
- with pytest.raises(TypeError):
+ with pytest.raises(TypeError, match=msg):
  store.append("df", df, data_columns=["C"])
 
 
 def test_complex_series_error(setup_path):
  complex128 = np.array([1.0 + 1.0j, 1.0 + 1.0j, 1.0 + 1.0j, 1.0 + 1.0j])
  s = Series(complex128, index=list("abcd"))
 
+ msg = (
+ "Columns containing complex values can be stored "
+ "but cannot be indexed when using table format. "
+ "Either use fixed format, set index=False, "
+ "or do not include the columns containing complex "
+ "values to data_columns when initializing the table."
+ )
+
  with ensure_clean_path(setup_path) as path:
- with pytest.raises(TypeError):
+ with pytest.raises(TypeError, match=msg):
  s.to_hdf(path, "obj", format="t")
 
  with ensure_clean_path(setup_path) as path:

pandas/tests/io/test_clipboard.py

@@ -238,10 +238,11 @@ def test_read_clipboard_infer_excel(self, request, mock_clipboard):
  tm.assert_frame_equal(res, exp)
 
  def test_invalid_encoding(self, df):
+ msg = "clipboard only supports utf-8 encoding"
  # test case for testing invalid encoding
- with pytest.raises(ValueError):
+ with pytest.raises(ValueError, match=msg):
  df.to_clipboard(encoding="ascii")
- with pytest.raises(NotImplementedError):
+ with pytest.raises(NotImplementedError, match=msg):
  pd.read_clipboard(encoding="ascii")
 
  @pytest.mark.parametrize("enc", ["UTF-8", "utf-8", "utf8"])

pandas/tests/plotting/frame/test_frame_subplots.py

@@ -218,9 +218,13 @@ def test_subplots_layout_multi_column(self):
  self._check_axes_shape(axes, axes_num=3, layout=(4, 1))
  assert axes.shape == (4, 1)
 
- with pytest.raises(ValueError):
+ msg = "Layout of 1x1 must be larger than required size 3"
+
+ with pytest.raises(ValueError, match=msg):
  df.plot(subplots=True, layout=(1, 1))
- with pytest.raises(ValueError):
+
+ msg = "At least one dimension of layout must be positive"
+ with pytest.raises(ValueError, match=msg):
  df.plot(subplots=True, layout=(-1, -1))
 
  @pytest.mark.parametrize(
@@ -272,7 +276,9 @@ def test_subplots_multiple_axes(self):
  self._check_axes_shape(axes, axes_num=6, layout=(2, 3))
  tm.close()
 
- with pytest.raises(ValueError):
+ msg = "The number of passed axes must be 3, the same as the output plot"
+
+ with pytest.raises(ValueError, match=msg):
  fig, axes = self.plt.subplots(2, 3)
  # pass different number of axes from required
  df.plot(subplots=True, ax=axes)