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Closes issue 17467. Add readline and readlines support to unittest.mock.mock_open

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Michael Foord 2013-03-19 17:22:51 -07:00
parent 94f2788a85
commit 04cbe0c35b
4 changed files with 141 additions and 8 deletions
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8
Doc/library/unittest.mock.rst
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@ -1989,8 +1989,12 @@ mock_open
default) then a `MagicMock` will be created for you, with the API limited
to methods or attributes available on standard file handles.
`read_data` is a string for the `read` method of the file handle to return.
This is an empty string by default.
`read_data` is a string for the `read`, `readline`, and `readlines` methods
of the file handle to return. Calls to those methods will take data from
`read_data` until it is depleted. The mock of these methods is pretty
simplistic. If you need more control over the data that you are feeding to
the tested code you will need to customize this mock for yourself.
`read_data` is an empty string by default.
Using `open` as a context manager is a great way to ensure your file handles
are closed properly and is becoming common::