Robert Collins added the comment:
Actually, further inspection and a teddybear with Angus Lees uncovers this:
diff --git a/Lib/unittest/test/testmock/testmock.py
b/Lib/unittest/test/testmock/testmock.py
--- a/Lib/unittest/test/testmock/testmock.py
+++ b/Lib/unittest/test/testmock/testmock.py
@@ -1419,6 +1419,18 @@
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()
./python Lib/unittest/test/testmock/testmock.py
..........................................s........E............................
======================================================================
ERROR: test_mock_open_after_eof (__main__.MockTest)
----------------------------------------------------------------------
Traceback (most recent call last):
File "Lib/unittest/test/testmock/testmock.py", line 1430, in
test_mock_open_after_eof
self.assertEqual('', h.readline())
File "/home/robertc/work/cpython-3.5.hg/Lib/unittest/mock.py", line 917, in
__call__
return _mock_self._mock_call(*args, **kwargs)
File "/home/robertc/work/cpython-3.5.hg/Lib/unittest/mock.py", line 976, in
_mock_call
result = next(effect)
StopIteration
----------------------------------------------------------------------
Ran 80 tests in 0.197s
FAILED (errors=1, skipped=1)
That is, we need the yield '' to be infinite - while True: yield '', or the
while True: to be outside the try:except.
----------
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<http://bugs.python.org/issue26807>
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