@@ -88,3 +88,33 @@ def test_titles_respect_theme(
8888
8989assert ax .xaxis .label .get_color ()== expected_text_colour
9090assert ax .yaxis .label .get_color ()== expected_text_colour
91+
92+
93+ @pytest .mark .mpl_image_compare
94+ def test_no_theme_side_effects (make_napari_viewer ):
95+ """Ensure that napari-matplotlib doesn't pollute the globally set style.
96+
97+ A MWE to guard aganst issue matplotlib/#64. Should always reproduce a plot
98+ with the default matplotlib style.
99+ """
100+ import matplotlib .pyplot as plt
101+
102+ np .random .seed (12345 )
103+
104+ # should not affect global matplotlib plot style
105+ viewer = make_napari_viewer ()
106+ viewer .theme = "dark"
107+ NapariMPLWidget (viewer )
108+
109+ # some plotting unrelated to napari-matplotlib
110+ normal_dist = np .random .normal (size = 1000 )
111+ unrelated_figure ,ax = plt .subplots ()
112+ ax .hist (normal_dist ,bins = 100 )
113+ ax .set_xlabel ("something unrelated to napari (x)" )
114+ ax .set_ylabel ("something unrelated to napari (y)" )
115+ ax .set_title (
116+ "this plot style should not change with napari styles or themes"
117+ )
118+ unrelated_figure .tight_layout ()
119+
120+ return unrelated_figure