TST: stop suppressing plot test exceptions, xfail broken test (#29099)

Author: jbrockmendel

pandas/tests/plotting/common.py

@@ -12,6 +12,7 @@
 
 from pandas.core.dtypes.api import is_list_like
 
+import pandas as pd
 from pandas import DataFrame, Series
 import pandas.util.testing as tm
 from pandas.util.testing import assert_is_valid_plot_return_object, ensure_clean
@@ -541,13 +542,13 @@ def _check_plot_works(f, filterwarnings="always", **kwargs):
 
             assert_is_valid_plot_return_object(ret)
 
-            try:
-                kwargs["ax"] = fig.add_subplot(212)
-                ret = f(**kwargs)
-            except Exception:
-                pass
+            if f is pd.plotting.bootstrap_plot:
+                assert "ax" not in kwargs
             else:
-                assert_is_valid_plot_return_object(ret)
+                kwargs["ax"] = fig.add_subplot(212)
+
+            ret = f(**kwargs)
+            assert_is_valid_plot_return_object(ret)
 
             with ensure_clean(return_filelike=True) as path:
                 plt.savefig(path)

pandas/tests/plotting/test_frame.py

@@ -3,6 +3,7 @@
 """ Test cases for DataFrame.plot """
 
 from datetime import date, datetime
+import itertools
 import string
 import warnings
 
@@ -2604,12 +2605,6 @@ def test_errorbar_plot(self):
             ax = _check_plot_works(df.plot, yerr=np.ones((2, 12)) * 0.4)
             self._check_has_errorbars(ax, xerr=0, yerr=2)
 
-            # yerr is iterator
-            import itertools
-
-            ax = _check_plot_works(df.plot, yerr=itertools.repeat(0.1, len(df)))
-            self._check_has_errorbars(ax, xerr=0, yerr=2)
-
             # yerr is column name
             for yerr in ["yerr", "誤差"]:
                 s_df = df.copy()
@@ -2626,6 +2621,17 @@ def test_errorbar_plot(self):
             with pytest.raises((ValueError, TypeError)):
                 df.plot(yerr=df_err)
 
+    @pytest.mark.xfail(reason="Iterator is consumed", raises=ValueError)
+    @pytest.mark.slow
+    def test_errorbar_plot_iterator(self):
+        with warnings.catch_warnings():
+            d = {"x": np.arange(12), "y": np.arange(12, 0, -1)}
+            df = DataFrame(d)
+
+            # yerr is iterator
+            ax = _check_plot_works(df.plot, yerr=itertools.repeat(0.1, len(df)))
+            self._check_has_errorbars(ax, xerr=0, yerr=2)
+
     @pytest.mark.slow
     def test_errorbar_with_integer_column_names(self):
         # test with integer column names