192 lines
5.2 KiB
Plaintext
192 lines
5.2 KiB
Plaintext
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.. _usage:
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Usage and Invocations
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==========================================
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.. _cmdline:
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Calling pytest through ``python -m pytest``
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-----------------------------------------------------
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.. versionadded:: 2.0
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If you use Python-2.5 or later you can invoke testing through the
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Python interpreter from the command line::
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python -m pytest [...]
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This is equivalent to invoking the command line script ``py.test [...]``
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directly.
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Getting help on version, option names, environment variables
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--------------------------------------------------------------
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::
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py.test --version # shows where pytest was imported from
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py.test --fixtures # show available builtin function arguments
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py.test -h | --help # show help on command line and config file options
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Stopping after the first (or N) failures
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---------------------------------------------------
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To stop the testing process after the first (N) failures::
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py.test -x # stop after first failure
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py.test --maxfail=2 # stop after two failures
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Specifying tests / selecting tests
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---------------------------------------------------
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Several test run options::
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py.test test_mod.py # run tests in module
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py.test somepath # run all tests below path
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py.test -k string # only run tests whose names contain a string
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Import 'pkg' and use its filesystem location to find and run tests::
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py.test --pyargs pkg # run all tests found below directory of pypkg
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Modifying Python traceback printing
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----------------------------------------------
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Examples for modifying traceback printing::
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py.test --showlocals # show local variables in tracebacks
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py.test -l # show local variables (shortcut)
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py.test --tb=long # the default informative traceback formatting
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py.test --tb=native # the Python standard library formatting
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py.test --tb=short # a shorter traceback format
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py.test --tb=line # only one line per failure
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Dropping to PDB (Python Debugger) on failures
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----------------------------------------------
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.. _PDB: http://docs.python.org/library/pdb.html
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Python comes with a builtin Python debugger called PDB_. ``py.test``
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allows one to drop into the PDB prompt via a command line option::
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py.test --pdb
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This will invoke the Python debugger on every failure. Often you might
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only want to do this for the first failing test to understand a certain
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failure situation::
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py.test -x --pdb # drop to PDB on first failure, then end test session
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py.test --pdb --maxfail=3 # drop to PDB for the first three failures
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Setting a breakpoint / aka ``set_trace()``
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----------------------------------------------------
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If you want to set a breakpoint and enter the ``pdb.set_trace()`` you
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can use a helper::
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import pytest
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def test_function():
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...
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pytest.set_trace() # invoke PDB debugger and tracing
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.. versionadded: 2.0.0
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In previous versions you could only enter PDB tracing if
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you disabled capturing on the command line via ``py.test -s``.
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.. _durations:
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Profiling test execution duration
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-------------------------------------
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.. versionadded: 2.2
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To get a list of the slowest 10 test durations::
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py.test --durations=10
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Creating JUnitXML format files
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----------------------------------------------------
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To create result files which can be read by Hudson_ or other Continuous
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integration servers, use this invocation::
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py.test --junitxml=path
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to create an XML file at ``path``.
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Creating resultlog format files
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----------------------------------------------------
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To create plain-text machine-readable result files you can issue::
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py.test --resultlog=path
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and look at the content at the ``path`` location. Such files are used e.g.
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by the `PyPy-test`_ web page to show test results over several revisions.
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.. _`PyPy-test`: http://buildbot.pypy.org/summary
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Sending test report to pocoo pastebin service
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-----------------------------------------------------
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**Creating a URL for each test failure**::
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py.test --pastebin=failed
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This will submit test run information to a remote Paste service and
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provide a URL for each failure. You may select tests as usual or add
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for example ``-x`` if you only want to send one particular failure.
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**Creating a URL for a whole test session log**::
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py.test --pastebin=all
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Currently only pasting to the http://bpaste.net service is implemented.
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Calling pytest from Python code
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----------------------------------------------------
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.. versionadded:: 2.0
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You can invoke ``py.test`` from Python code directly::
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pytest.main()
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this acts as if you would call "py.test" from the command line.
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It will not raise ``SystemExit`` but return the exitcode instead.
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You can pass in options and arguments::
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pytest.main(['x', 'mytestdir'])
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or pass in a string::
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pytest.main("-x mytestdir")
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You can specify additional plugins to ``pytest.main``::
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# content of myinvoke.py
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import pytest
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class MyPlugin:
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def pytest_sessionfinish(self):
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print("*** test run reporting finishing")
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pytest.main("-qq", plugins=[MyPlugin()])
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Running it will show that ``MyPlugin`` was added and its
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hook was invoked::
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$ python myinvoke.py
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collecting ... collected 0 items
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in 0.01 seconds
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*** test run reporting finishing
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.. include:: links.inc
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