Add force draw to generate the warning

parthpankajtiwary · parthpankajtiwary · commit 10c413adfcdd · 2022-11-28T10:48:32.000+01:00
diff --git a/lib/matplotlib/tests/test_scale.py b/lib/matplotlib/tests/test_scale.py
@@ -66,8 +66,8 @@ def test_symlog_linthresh():
     ax.set_xscale('symlog')
     ax.set_yscale('symlog')
 
-    with pytest.warns(UserWarning):
-        plt.show()
+    with pytest.warns(UserWarning, match="All values .* of linthresh"):
+        fig.canvas.draw()
 
 
 @image_comparison(['logit_scales.png'], remove_text=True)
