TST: Restore some tolerances for some arch/platform-specific failures

The tolerances on these were increased in various PRs, with notes to reduce/remove them, so they were removed in #30184, but should have been reverted to a smaller value: - `test_floating_axes.py::test_curvelinear4[png]` fails on macOS - `test_grid_helper_curvelinear.py::test_axis_direction[png]` fails on ARM and macOS - `test_grid_helper_curvelinear.py::test_polar_box[png]` fails on Windows, ARM, and macOS These fail on macOS; there's tolerances on them already, they fail by just a small amount, so increase them: - `test_bbox_tight.py::test_bbox_inches_tight_suptile_legend[png]` - `test_patheffects.py::test_collection[png]` - `test_axes3d.py::test_scale3d_artists_log[png]` This fails only on AppVeyor (Windows), but not Azure. There is a tolerance there already, so just add it to the list: - `test_mathtext.py::test_mathtext_rendering`
QuLogic · Mar 27, 2026 · Mar 24, 2026 · Mar 20, 2026 · Mar 26, 2026 · Mar 27, 2026
commit 573764e43a8a4ed7621d2c4a287b9a5b8d009be9
diff --git a/lib/matplotlib/tests/test_bbox_tight.py b/lib/matplotlib/tests/test_bbox_tight.py
@@ -47,7 +47,7 @@ def test_bbox_inches_tight(text_placeholders):
 
 @image_comparison(['bbox_inches_tight_suptile_legend'],
                   savefig_kwarg={'bbox_inches': 'tight'},
-                  tol=0 if platform.machine() == 'x86_64' else 0.022)
+                  tol=0 if platform.machine() == 'x86_64' else 0.024)
 def test_bbox_inches_tight_suptile_legend():
     plt.plot(np.arange(10), label='a straight line')
     plt.legend(bbox_to_anchor=(0.9, 1), loc='upper left')

diff --git a/lib/matplotlib/tests/test_mathtext.py b/lib/matplotlib/tests/test_mathtext.py
@@ -224,8 +224,11 @@ def baseline_images(request, fontset, index, text):
 @pytest.mark.parametrize(
     'fontset', ['cm', 'stix', 'stixsans', 'dejavusans', 'dejavuserif'])
 @pytest.mark.parametrize('baseline_images', ['mathtext'], indirect=True)
-@image_comparison(baseline_images=None, style='mpl20',
-                  tol=0.011 if platform.machine() in ('ppc64le', 's390x') else 0)
+@image_comparison(
+    baseline_images=None, style='mpl20',
+    tol=(0.013
+         if platform.machine() in ('ppc64le', 's390x') or platform.system() == 'Windows'
+         else 0))
 def test_mathtext_rendering(baseline_images, fontset, index, text):
     mpl.rcParams['mathtext.fontset'] = fontset
     fig = plt.figure(figsize=(5.25, 0.75))

diff --git a/lib/matplotlib/tests/test_patheffects.py b/lib/matplotlib/tests/test_patheffects.py
@@ -120,7 +120,7 @@ def test_SimplePatchShadow_offset():
     assert pe._offset == (4, 5)
 
 
-@image_comparison(['collection'], tol=0.03, style='mpl20')
+@image_comparison(['collection'], tol=0.032, style='mpl20')
 def test_collection():
     x, y = np.meshgrid(np.linspace(0, 10, 150), np.linspace(-5, 5, 100))
     data = np.sin(x) + np.cos(y)

diff --git a/lib/mpl_toolkits/axisartist/tests/test_floating_axes.py b/lib/mpl_toolkits/axisartist/tests/test_floating_axes.py
@@ -63,7 +63,7 @@ def test_curvelinear3():
     l.set_clip_path(ax1.patch)
 
 
-@image_comparison(['curvelinear4.png'], style='mpl20')
+@image_comparison(['curvelinear4.png'], style='mpl20', tol=0.04)
 def test_curvelinear4():
     fig = plt.figure(figsize=(5, 5))
 

diff --git a/lib/mpl_toolkits/axisartist/tests/test_grid_helper_curvelinear.py b/lib/mpl_toolkits/axisartist/tests/test_grid_helper_curvelinear.py
@@ -78,7 +78,7 @@ def inverted(self):
     ax1.grid(True)
 
 
-@image_comparison(['polar_box.png'], style='mpl20')
+@image_comparison(['polar_box.png'], style='mpl20', tol=0.04)
 def test_polar_box():
     plt.rcParams.update({"xtick.direction": "inout", "ytick.direction": "out"})
     fig = plt.figure(figsize=(5, 5))
@@ -138,7 +138,7 @@ def test_polar_box():
     ax1.grid(True)
 
 
-@image_comparison(['axis_direction.png'], style='mpl20')
+@image_comparison(['axis_direction.png'], style='mpl20', tol=0.04)
 def test_axis_direction():
     fig = plt.figure(figsize=(5, 5))
 

diff --git a/lib/mpl_toolkits/mplot3d/tests/test_axes3d.py b/lib/mpl_toolkits/mplot3d/tests/test_axes3d.py
@@ -2878,7 +2878,7 @@ def _make_triangulation_data():
 
 
 @mpl3d_image_comparison(['scale3d_artists_log.png'], style='mpl20',
-                        remove_text=False, tol=0.03)
+                        remove_text=False, tol=0.032)
 def test_scale3d_artists_log():
     """Test all 3D artist types with log scale."""
     fig = plt.figure(figsize=(16, 12))