77 lines
2.6 KiB
Plaintext
77 lines
2.6 KiB
Plaintext
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working with 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(os.listdir(str(tmpdir))) == 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 2.6.5 -- pytest-2.0.0dev0
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test path 1: test_tmpdir.py
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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('/tmp/pytest-427/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(os.listdir(str(tmpdir))) == 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 0.03 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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..
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You can create directories by calling one of two methods
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on the config object:
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- ``config.mktemp(basename)``: create and return a new tempdir
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- ``config.ensuretemp(basename)``: create or return a new tempdir
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Temporary directories are by default created as sub directories of
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the system temporary directory. The name will be ``pytest-NUM`` where
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``NUM`` will be incremenated 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 logic and set it 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
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temporary data lands below below a single per-test run basetemp directory.
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.. _`py.path.local`: http://pylib.org/path.html
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