New submission from Niko <[email protected]>:
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
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Python tracker <[email protected]>
<https://bugs.python.org/issue44102>
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