FIX: add test tolerance

jklymak · jklymak · commit 34329d2dcacf · 2021-11-20T10:36:48.000+01:00
diff --git a/lib/matplotlib/colorbar.py b/lib/matplotlib/colorbar.py
@@ -1151,10 +1151,9 @@ def _mesh(self):
     def _forward_boundaries(self, x):
         # map boundaries equally between 0 and 1...
         b = self._boundaries
-        db = b[-1] - b[0]
         y = np.interp(x, b, np.linspace(0, 1, len(b)))
         # the following avoids ticks in the extends:
-        eps = db * 1e-6
+        eps = (b[-1] - b[0]) * 1e-6
         # map these _well_ out of bounds to keep any ticks out
         # of the extends region...
         y[x < b[0]-eps] = -1
diff --git a/lib/matplotlib/tests/test_contour.py b/lib/matplotlib/tests/test_contour.py
@@ -305,8 +305,12 @@ def test_clabel_zorder(use_clabeltext, contour_zorder, clabel_zorder):
         assert clabel.get_zorder() == expected_clabel_zorder
 
 
+# tol because ticks happen to fall on pixel boundaries so small
+# floating point changes in tick location flip which pixel gets
+# the tick.
 @image_comparison(['contour_log_extension.png'],
-                  remove_text=True, style='mpl20')
+                  remove_text=True, style='mpl20',
+                  tol=1.444)
 def test_contourf_log_extension():
     # Remove this line when this test image is regenerated.
     plt.rcParams['pcolormesh.snap'] = False
