From b15b01307ea266222363b0e31709c1d94c7966ac Mon Sep 17 00:00:00 2001
From: Takeshi KOMIYA <i.tkomiya@gmail.com>
Date: Wed, 8 Apr 2020 01:32:09 +0900
Subject: [PATCH] Fix #7422: autodoc: fails with ValueError when using
 autodoc_mock_imports

---
 CHANGES                |  2 ++
 sphinx/util/inspect.py | 13 +++++++++++--
 2 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/CHANGES b/CHANGES
index 212f4571fb7..5e8bcbe3328 100644
--- a/CHANGES
+++ b/CHANGES
@@ -16,6 +16,8 @@ Features added
 Bugs fixed
 ----------
 
+* #7422: autodoc: fails with ValueError when using autodoc_mock_imports
+
 Testing
 --------
 
diff --git a/sphinx/util/inspect.py b/sphinx/util/inspect.py
index 570ea9df677..64c1568f61c 100644
--- a/sphinx/util/inspect.py
+++ b/sphinx/util/inspect.py
@@ -17,7 +17,7 @@
 import warnings
 from functools import partial, partialmethod
 from inspect import (  # NOQA
-    Parameter, isclass, ismethod, ismethoddescriptor, unwrap
+    Parameter, isclass, ismethod, ismethoddescriptor
 )
 from io import StringIO
 from typing import Any, Callable, Mapping, List, Tuple
@@ -116,6 +116,15 @@ def getargspec(func: Callable) -> Any:
                                kwonlyargs, kwdefaults, annotations)
 
 
+def unwrap(obj: Any) -> Any:
+    """Get an original object from wrapped object (wrapped functions)."""
+    try:
+        return inspect.unwrap(obj)
+    except ValueError:
+        # might be a mock object
+        return obj
+
+
 def unwrap_all(obj: Any) -> Any:
     """
     Get an original object from wrapped object (unwrapping partials, wrapped
@@ -217,7 +226,7 @@ def isattributedescriptor(obj: Any) -> bool:
         return True
     elif isdescriptor(obj):
         # non data descriptor
-        unwrapped = inspect.unwrap(obj)
+        unwrapped = unwrap(obj)
         if isfunction(unwrapped) or isbuiltin(unwrapped) or inspect.ismethod(unwrapped):
             # attribute must not be either function, builtin and method
             return False