[New-bugs-announce] [issue44102] mock_open does not support the use of 'seek()'
Niko
report at bugs.python.org
Mon May 10 07:32:27 EDT 2021
New submission from Niko <nikle at cendio.com>:
Using 'mock_open' to unit test a code that uses the 'seek()' function for the file object does not work. This would be a great addition for mock_open functionality as this use case happens occasionally.
Test file contains:
def test_one(self):
with patch("builtins.open", mock_open(read_data="#123")):
script.main()
Example script:
def main():
with open('some/file', 'r') as f:
print(f.read(1))
f.seek(0)
print(f.read(1))
if __name__ == "__main__":
main()
Output will be:
#
1
While the expected output is:
#
#
----------
messages: 393378
nosy: nikle
priority: normal
severity: normal
status: open
title: mock_open does not support the use of 'seek()'
type: behavior
versions: Python 3.9
_______________________________________
Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue44102>
_______________________________________
More information about the New-bugs-announce
mailing list