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TST: Adding test for checking that plotting grid param by default is mpl.rcParams['axes.grid'] #44114

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TST: Adding test for checking that plotting grid param by default is mpl.rcParams['axes.grid'] #44114

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16 changes: 15 additions & 1 deletion pandas/tests/plotting/test_style.py
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Original file line number Diff line number Diff line change
@@ -1,6 +1,9 @@
import pytest

from pandas import Series
from pandas import (
DataFrame,
Series,
)

pytest.importorskip("matplotlib")
from pandas.plotting._matplotlib.style import get_standard_colors
Expand Down Expand Up @@ -157,3 +160,14 @@ def test_empty_color_raises(self, color):
def test_bad_color_raises(self, color):
with pytest.raises(ValueError, match="Invalid color"):
get_standard_colors(color=color, num_colors=5)


class TestDefaultMplStyleParams:
@pytest.mark.parametrize("rcGrid", [True, False])
def test_mplback_df_plot_by_default_use_axes_grid_from_rcparams(self, rcGrid):
import matplotlib as mpl

# GH 3188
mpl.rcParams["axes.grid"] = rcGrid
ax = DataFrame([1, 2, 3, 4, 5]).plot()
assert mpl.rcParams["axes.grid"] == ax._gridOn