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A better mock for file I/O.
$ pip install mock-open
MockOpen
The MockOpen
class should work as a stand-in replacement for mock.mock_open
with
some added features (though it tries to conform to how the builtin open
works where the two
differ):
Multiple file support, including a mapping-like access to file mocks by path:
from mock_open import MockOpen
mock_open = MockOpen()
mock_open["/path/to/file"].read_data = "Data from a fake file-like object"
mock_open["/path/to/bad_file"].side_effect = IOError()
You can also configure behavior via the regular mock
library API:
mock_open = MockOpen()
mock_open.return_value.write.side_effect = IOError()
Persistent file contents between calls to open
:
with patch("builtins.open", MockOpen()):
with open("/path/to/file", "w") as handle:
handle.write("Some text")
with open("/path/to/file", "r") as handle:
assert "Some text" == handle.read()
All the regular file operations: read
, readline
, readlines
, write
, writelines
, seek
,
tell
.
This library uses modified versions of tests from the CPython source code as part of its test suite. The original tests are licensed under the PSF license agreement and are copyright of the Python Software Foundation.
FAQs
A better mock for file I/O
We found that mock-open demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 1 open source maintainer collaborating on the project.
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