TST: up tolerance for test_collection

* [ ]: matplotlib.tests.test_patheffects.test_collection.test (RMS 0.006) (x64,35)
* [ ]: matplotlib.tests.test_patheffects.test_collection.test (RMS 0.008) (x86,27)
* [ ]: matplotlib.tests.test_patheffects.test_collection.test (RMS 0.012) (x64,27)
* [ ]: matplotlib.tests.test_patheffects.test_collection.test (RMS 0.012) (x64,34)

This has a black diff, so up the tolerance on windows to 0.013

Author: jankatins

lib/matplotlib/tests/test_patheffects.py

@@ -17,6 +17,9 @@
     import mock
 from nose.tools import assert_equal
 
+import sys
+on_win = (sys.platform == 'win32')
+
 
 @image_comparison(baseline_images=['patheffect1'], remove_text=True)
 def test_patheffect1():
@@ -110,7 +113,7 @@ def test_SimplePatchShadow_offset():
     assert_equal(pe._offset, (4, 5))
 
 
-@image_comparison(baseline_images=['collection'])
+@image_comparison(baseline_images=['collection'], tol=0.013 if on_win else 0)
 def test_collection():
     x, y = np.meshgrid(np.linspace(0, 10, 150), np.linspace(-5, 5, 100))
     data = np.sin(x) + np.cos(y)