Remove ticks and titles from tight bbox tests. (matplotlib#12790)

These text elements may shift with different versions of FreeType,
making the tight bbox results unstable when building against external
newer versions.

Author: QuLogic

lib/matplotlib/tests/test_axes.py

@@ -16,7 +16,8 @@
 import warnings
 
 import matplotlib
-from matplotlib.testing.decorators import image_comparison, check_figures_equal
+from matplotlib.testing.decorators import (
+    image_comparison, check_figures_equal, remove_ticks_and_titles)
 import matplotlib.pyplot as plt
 import matplotlib.markers as mmarkers
 import matplotlib.patches as mpatches
@@ -5913,9 +5914,10 @@ class DummySubplot(matplotlib.axes.SubplotBase, Dummy):
 
 def test_gettightbbox_ignoreNaN():
     fig, ax = plt.subplots()
+    remove_ticks_and_titles(fig)
     t = ax.text(np.NaN, 1, 'Boo')
     renderer = fig.canvas.get_renderer()
-    np.testing.assert_allclose(ax.get_tightbbox(renderer).width, 532.444444)
+    np.testing.assert_allclose(ax.get_tightbbox(renderer).width, 496)
 
 
 def test_scatter_series_non_zero_index(pd):

lib/mpl_toolkits/tests/test_axes_grid1.py

@@ -1,6 +1,7 @@
 import matplotlib
 import matplotlib.pyplot as plt
-from matplotlib.testing.decorators import image_comparison
+from matplotlib.testing.decorators import (
+    image_comparison, remove_ticks_and_titles)
 
 from mpl_toolkits.axes_grid1 import host_subplot
 from mpl_toolkits.axes_grid1 import make_axes_locatable
@@ -409,7 +410,6 @@ def test_image_grid():
 
 
 def test_gettightbbox():
-
     fig, ax = plt.subplots(figsize=(8, 6))
 
     l, = ax.plot([1, 2, 3], [0, 1, 0])
@@ -418,6 +418,8 @@ def test_gettightbbox():
     ax_zoom.plot([1, 2, 3], [0, 1, 0])
 
     mark_inset(ax, ax_zoom, loc1=1, loc2=3, fc="none", ec='0.3')
+
+    remove_ticks_and_titles(fig)
     bbox = fig.get_tightbbox(fig.canvas.get_renderer())
     np.testing.assert_array_almost_equal(bbox.extents,
-            [-18.022743, -14.118056,   7.332813,   5.4625])
+                                         [-17.7, -13.9, 7.2, 5.4])