74 lines
2.4 KiB
Plaintext
74 lines
2.4 KiB
Plaintext
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.. _`tmpdir handling`:
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Temporary directories and files
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================================================
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The 'tmpdir' test function argument
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-----------------------------------
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You can use the ``tmpdir`` function argument which will
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provide a temporary directory unique to the test invocation,
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created in the `base temporary directory`_.
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``tmpdir`` is a `py.path.local`_ object which offers ``os.path`` methods
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and more. Here is an example test usage::
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# content of test_tmpdir.py
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import os
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def test_create_file(tmpdir):
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p = tmpdir.mkdir("sub").join("hello.txt")
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p.write("content")
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assert p.read() == "content"
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assert len(tmpdir.listdir()) == 1
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assert 0
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Running this would result in a passed test except for the last
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``assert 0`` line which we use to look at values::
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$ py.test test_tmpdir.py
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=========================== test session starts ============================
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platform linux2 -- Python 2.7.3 -- pytest-2.3.0.dev2
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plugins: xdist, bugzilla, cache, oejskit, pep8, cov
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collecting ... collected 1 items
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test_tmpdir.py F
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================================= FAILURES =================================
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_____________________________ test_create_file _____________________________
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tmpdir = local('/home/hpk/tmp/pytest-2886/test_create_file0')
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def test_create_file(tmpdir):
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p = tmpdir.mkdir("sub").join("hello.txt")
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p.write("content")
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assert p.read() == "content"
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assert len(tmpdir.listdir()) == 1
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> assert 0
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E assert 0
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test_tmpdir.py:7: AssertionError
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========================= 1 failed in 0.23 seconds =========================
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.. _`base temporary directory`:
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The default base temporary directory
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-----------------------------------------------
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Temporary directories are by default created as sub-directories of
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the system temporary directory. The base name will be ``pytest-NUM`` where
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``NUM`` will be incremented with each test run. Moreover, entries older
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than 3 temporary directories will be removed.
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You can override the default temporary directory setting like this::
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py.test --basetemp=mydir
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When distributing tests on the local machine, ``py.test`` takes care to
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configure a basetemp directory for the sub processes such that all temporary
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data lands below a single per-test run basetemp directory.
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.. _`py.path.local`: http://pylib.org/path.html
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