Doctest integration for modules and test files
=========================================================

By default all files matching the ``test*.txt`` pattern will
be run through the python standard ``doctest`` module.  You
can change the pattern by issuing::

    py.test --doctest-glob='*.rst'

on the command line.  You can also trigger running of doctests
from docstrings in all python modules (including regular
python test modules)::

    py.test --doctest-modules

You can make these changes permanent in your project by
putting them into a pytest.ini file like this::

    # content of pytest.ini
    [pytest]
    addopts = --doctest-modules

If you then have a text file like this::

    # content of example.rst

    hello this is a doctest
    >>> x = 3
    >>> x
    3

and another like this::

    # content of mymodule.py
    def something():
        """ a doctest in a docstring
        >>> something()
        42
        """
        return 42

then you can just invoke ``py.test`` without command line options::

    $ py.test
    =========================== test session starts ============================
    platform linux2 -- Python 2.7.3 -- pytest-2.3.5
    collected 1 items
    
    mymodule.py .
    
    ========================= 1 passed in 0.02 seconds =========================

It is possible to use fixtures using the ``getfixture`` helper::

    # content of example.rst
    >>> tmp = getfixture('tmpdir')
    >>> ...