fix test_autodoc with Python 3.6.5

fix-test_autodoc.patch

@@ -0,0 +1,32 @@
+diff --git a/sphinx/util/inspect.py b/sphinx/util/inspect.py
+index e8427fd84..492db8700 100644
+--- a/sphinx/util/inspect.py
++++ b/sphinx/util/inspect.py
+@@ -313,7 +313,10 @@ def __init__(self, subject, bound_method=False):
+             try:
+                 self.signature = inspect.signature(subject)
+             except IndexError:
+-                if hasattr(subject, '_partialmethod'):  # partialmethod with no argument
++                # Until python 3.6.4, cpython has been crashed on inspection for
++                # partialmethods not having any arguments.
++                # https://bugs.python.org/issue33009
++                if hasattr(subject, '_partialmethod'):
+                     self.signature = None
+                     self.partialmethod_with_noargs = True
+                 else:
+diff --git a/tests/test_autodoc.py b/tests/test_autodoc.py
+index 9398edc34..ed6d050fa 100644
+--- a/tests/test_autodoc.py
++++ b/tests/test_autodoc.py
+@@ -952,7 +952,10 @@ def call_autodoc(objtype, name):
+         '      Update state of cell to *state*.',
+         '      ',
+     ]
+-    if sys.version_info < (3, 5, 4):
++    if (sys.version_info < (3, 5, 4) or
++            (3, 6, 5) <= sys.version_info < (3, 7) or
++            (3, 7, 0, 'beta', 3) <= sys.version_info):
++        # TODO: this condition should be updated after 3.7-final release.
+         expected = '\n'.join(expected).replace(' -> None', '').split('\n')
+ 
+     assert call_autodoc('class', 'target.partialmethod.Cell') == expected

python-sphinx.spec

@@ -42,6 +42,10 @@ Source6:    default-sphinx-command.in
 # to fetch images, which is not possible in koji or mock.
 Patch0: xfail-test_latex_remote_images.patch
 
+# Fix test_autodoc failure with Python 3.6.5
+# Fixed upstream: https://github.com/sphinx-doc/sphinx/pull/4822
+patch1: fix-test_autodoc.patch
+
 BuildArch:     noarch
 BuildRequires: python2-devel >= 2.4
 BuildRequires: python2-babel