TST/WIP: stricter xfails

pandas/tests/plotting/frame/test_frame.py

@@ -8,6 +8,7 @@
 import numpy as np
 import pytest
 
+from pandas.compat import PY38, is_platform_windows
 import pandas.util._test_decorators as td
 
 from pandas.core.dtypes.api import is_list_like
@@ -483,12 +484,13 @@ def test_line_lim(self):
             assert xmax >= lines[0].get_data()[0][-1]
 
     @pytest.mark.xfail(
-        strict=False,
+        is_platform_windows() or not PY38,
         reason="2020-12-01 this has been failing periodically on the "
         "ymin==0 assertion for a week or so.",
     )
     @pytest.mark.parametrize("stacked", [True, False])
-    def test_area_lim(self, stacked):
+    def test_area_lim(self, stacked, request):
+
         df = DataFrame(np.random.rand(6, 4), columns=["x", "y", "z", "four"])
 
         neg_df = -df

pandas/tests/plotting/test_converter.py

@@ -78,7 +78,6 @@ def test_registering_no_warning(self):
     @pytest.mark.xfail(
         is_platform_windows(),
         reason="Getting two warnings intermittently, see GH#37746",
-        strict=False,
     )
     def test_pandas_plots_register(self):
         plt = pytest.importorskip("matplotlib.pyplot")

pandas/tests/plotting/test_groupby.py

@@ -19,7 +19,6 @@ class TestDataFrameGroupByPlots(TestPlotBase):
     @pytest.mark.xfail(
         is_platform_windows(),
         reason="Looks like LinePlot._is_ts_plot is wrong",
-        strict=False,
     )
     def test_series_groupby_plotting_nominally_works(self):
         n = 10