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HACKING.rst: add strpath gotcha to testing gotchas section #446

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8 changes: 8 additions & 0 deletions HACKING.rst
Original file line number Diff line number Diff line change
Expand Up @@ -227,6 +227,14 @@ The following guidelines should be followed:
* ``tmpdir_factory``
* ``tmpdir``

* On xenial, the objects returned by the ``tmpdir`` fixture cannot be
used where paths are required; they are rejected as invalid paths.
You must instead use their ``.strpath`` attribute.

* For example, instead of
``util.write_file(tmpdir.join("some_file"), ...)``, you should
write ``util.write_file(tmpdir.join("some_file").strpath, ...)``.

* Variables/parameter names for ``Mock`` or ``MagicMock`` instances
should start with ``m_`` to clearly distinguish them from non-mock
variables
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