From 9549a3e3d4be2a15c222996abff8cb97180ee9be Mon Sep 17 00:00:00 2001
From: Robert Collins <rbtcollins@hp.com>
Date: Mon, 16 May 2016 15:22:01 +1200
Subject: Issue #26807: mock_open 'files' no longer error on readline at end of
 file.

Patch from Yolanda Robla.
---
 Lib/unittest/mock.py                   |  2 ++
 Lib/unittest/test/testmock/testmock.py | 12 ++++++++++++
 Misc/ACKS                              |  1 +
 Misc/NEWS                              |  3 +++
 4 files changed, 18 insertions(+)

diff --git a/Lib/unittest/mock.py b/Lib/unittest/mock.py
index cabae15..86a5a3d 100644
--- a/Lib/unittest/mock.py
+++ b/Lib/unittest/mock.py
@@ -2323,6 +2323,8 @@ def mock_open(mock=None, read_data=''):
                 yield handle.readline.return_value
         for line in _state[0]:
             yield line
+        while True:
+            yield type(read_data)()
 
 
     global file_spec
diff --git a/Lib/unittest/test/testmock/testmock.py b/Lib/unittest/test/testmock/testmock.py
index 03c95de..5f82b82 100644
--- a/Lib/unittest/test/testmock/testmock.py
+++ b/Lib/unittest/test/testmock/testmock.py
@@ -1419,6 +1419,18 @@ class MockTest(unittest.TestCase):
         self.assertEqual('abc', first)
         self.assertEqual('abc', second)
 
+    def test_mock_open_after_eof(self):
+        # read, readline and readlines should work after end of file.
+        _open = mock.mock_open(read_data='foo')
+        h = _open('bar')
+        h.read()
+        self.assertEqual('', h.read())
+        self.assertEqual('', h.read())
+        self.assertEqual('', h.readline())
+        self.assertEqual('', h.readline())
+        self.assertEqual([], h.readlines())
+        self.assertEqual([], h.readlines())
+
     def test_mock_parents(self):
         for Klass in Mock, MagicMock:
             m = Klass()
diff --git a/Misc/ACKS b/Misc/ACKS
index 2d920db..dda42ca 100644
--- a/Misc/ACKS
+++ b/Misc/ACKS
@@ -1223,6 +1223,7 @@ Ben Roberts
 Mark Roberts
 Andy Robinson
 Jim Robinson
+Yolanda Robla
 Daniel Rocco
 Mark Roddy
 Kevin Rodgers
diff --git a/Misc/NEWS b/Misc/NEWS
index e248275..73c32e9 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -124,6 +124,9 @@ Library
 - Issue #22274: In the subprocess module, allow stderr to be redirected to
   stdout even when stdout is not redirected.  Patch by Akira Li.
 
+- Issue #26807: mock_open 'files' no longer error on readline at end of file.
+  Patch from Yolanda Robla.
+
 - Issue #25745: Fixed leaking a userptr in curses panel destructor.
 
 - Issue #26977: Removed unnecessary, and ignored, call to sum of squares helper
-- 
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