[Python-checkins] [3.6] bpo-31178: Mock os.waitpid() in test_subprocess (GH-3896) (#3897)

[Victor Stinner]

https://github.com/python/cpython/commit/fae0512e58619231a566bf77aa21148440b0ec8d
commit: fae0512e58619231a566bf77aa21148440b0ec8d
branch: 3.6
author: Miss Islington (bot) <31488909+miss-islington at users.noreply.github.com>
committer: Victor Stinner <victor.stinner at gmail.com>
date: 2017-10-05T07:10:59-07:00
summary:

[3.6] bpo-31178: Mock os.waitpid() in test_subprocess (GH-3896) (#3897)

Fix test_exception_errpipe_bad_data() and
test_exception_errpipe_normal() of test_subprocess: mock os.waitpid()
to avoid calling the real os.waitpid(0, 0) which is an unexpected
side effect of the test.
(cherry picked from commit 11045c9d8a21dd9bd182a3939189db02815f9783)

files:
M Lib/test/test_subprocess.py

diff --git a/Lib/test/test_subprocess.py b/Lib/test/test_subprocess.py
index 391d08cd9c3..5016513decd 100644
--- a/Lib/test/test_subprocess.py
+++ b/Lib/test/test_subprocess.py
@@ -1568,8 +1568,10 @@ def proper_error(*args):
 
         fork_exec.side_effect = proper_error
 
-        with self.assertRaises(IsADirectoryError):
-            self.PopenNoDestructor(["non_existent_command"])
+        with mock.patch("subprocess.os.waitpid",
+                        side_effect=ChildProcessError):
+            with self.assertRaises(IsADirectoryError):
+                self.PopenNoDestructor(["non_existent_command"])
 
     @mock.patch("subprocess._posixsubprocess.fork_exec")
     def test_exception_errpipe_bad_data(self, fork_exec):
@@ -1586,8 +1588,10 @@ def bad_error(*args):
 
         fork_exec.side_effect = bad_error
 
-        with self.assertRaises(subprocess.SubprocessError) as e:
-            self.PopenNoDestructor(["non_existent_command"])
+        with mock.patch("subprocess.os.waitpid",
+                        side_effect=ChildProcessError):
+            with self.assertRaises(subprocess.SubprocessError) as e:
+                self.PopenNoDestructor(["non_existent_command"])
 
         self.assertIn(repr(error_data), str(e.exception))