Update tests that are marked flaky.

The Mathtext tests should no longer be flaky based on the previous change. Mark some PS tests as flaky because they require a lock that sometimes gets stuck on AppVeyor due to the multiple processes.
matplotlib · anntzer · Jun 10, 2017 · Jun 2, 2017 · Jun 3, 2017 · Jun 3, 2017
commit e05072980ba9930fd79958af4698e4214fe55e09
diff --git a/lib/matplotlib/tests/test_backend_pdf.py b/lib/matplotlib/tests/test_backend_pdf.py
@@ -178,6 +178,8 @@ def test_grayscale_alpha():
    ax.set_yticks([])


+# This tests tends to hit a TeX cache lock on AppVeyor.
+@pytest.mark.flaky(reruns=3)
 @needs_tex
 def test_missing_psfont(monkeypatch):
    """An error is raised if a TeX font lacks a Type-1 equivalent"""

diff --git a/lib/matplotlib/tests/test_backend_ps.py b/lib/matplotlib/tests/test_backend_ps.py
@@ -27,6 +27,8 @@
    reason="This test needs a TeX installation")


+# This tests tends to hit a TeX cache lock on AppVeyor.
+@pytest.mark.flaky(reruns=3)
 @pytest.mark.parametrize('format, use_log, rcParams', [
    ('ps', False, {}),
    needs_ghostscript(('ps', False, {'ps.usedistiller': 'ghostscript'})),

diff --git a/lib/matplotlib/tests/test_mathtext.py b/lib/matplotlib/tests/test_mathtext.py
@@ -167,9 +167,6 @@ def baseline_images(request, fontset, index):
    return ['%s_%s_%02d' % (request.param, fontset, index)]


-# See #7911 for why these tests are flaky and #7107 for why they are not so
-# easy to fix.
-@pytest.mark.flaky(reruns=3)
 @pytest.mark.parametrize('index, test', enumerate(math_tests),
                         ids=[str(index) for index in range(len(math_tests))])
 @pytest.mark.parametrize('fontset',
@@ -184,9 +181,6 @@ def test_mathtext_rendering(baseline_images, fontset, index, test):
             horizontalalignment='center', verticalalignment='center')


-# See #7911 for why these tests are flaky and #7107 for why they are not so
-# easy to fix.
-@pytest.mark.flaky(reruns=3)
 @pytest.mark.parametrize('index, test', enumerate(font_tests),
                         ids=[str(index) for index in range(len(font_tests))])
 @pytest.mark.parametrize('fontset',