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nose2's extends unittest
to make testing nicer.
nose2
originated as the successor to nose
.
nose2
is a distinct project and does not support all of the behaviors of nose
.
See differences
_ for a thorough rundown.
pytest
_ is an excellent test framework and we encourage users to consider
it for new projects.
It has a bigger team of maintainers and a larger community of users.
Because nose2
is based on unittest, you can start from the Python Standard
Library's documentation for unittest <https://docs.python.org/library/unittest.html>
_
and then use nose2 to add value on top of that.
nose2
looks for tests in Python files whose names start with test
and
runs every test function it discovers.
Here's an example of a simple test, written in typical unittest style:
.. code-block:: python
# in test_simple.py
import unittest
class TestStrings(unittest.TestCase):
def test_upper(self):
self.assertEqual("spam".upper(), "SPAM")
You can then run this test like so::
$ nose2 -v
test_upper (test_simple.TestStrings) ... ok
----------------------------------------------------------------------
Ran 1 test in 0.000s
OK
However, nose2
supports more testing configuration and provides more tools
than unittest
on its own.
For example, this test exercises just a few of nose2
's features:
.. code-block:: python
# in test_fancy.py
from nose2.tools import params
@params("Sir Bedevere", "Miss Islington", "Duck")
def test_is_knight(value):
assert value.startswith('Sir')
and then run this like so::
$ nose2 -v --pretty-assert
test_fancy.test_is_knight:1
'Sir Bedevere' ... ok
test_fancy.test_is_knight:2
'Miss Islington' ... FAIL
test_fancy.test_is_knight:3
'Duck' ... FAIL
======================================================================
FAIL: test_fancy.test_is_knight:2
'Miss Islington'
----------------------------------------------------------------------
Traceback (most recent call last):
File "/mnt/ebs/home/sirosen/tmp/test_fancy.py", line 6, in test_is_knight
assert value.startswith('Sir')
AssertionError
>>> assert value.startswith('Sir')
values:
value = 'Miss Islington'
value.startswith = <built-in method startswith of str object at 0x7f3c3172f430>
======================================================================
FAIL: test_fancy.test_is_knight:3
'Duck'
----------------------------------------------------------------------
Traceback (most recent call last):
File "/mnt/ebs/home/sirosen/tmp/test_fancy.py", line 6, in test_is_knight
assert value.startswith('Sir')
AssertionError
>>> assert value.startswith('Sir')
values:
value = 'Duck'
value.startswith = <built-in method startswith of str object at 0x7f3c3172d490>
----------------------------------------------------------------------
Ran 3 tests in 0.001s
FAILED (failures=2)
Full documentation for nose2
is available at docs.nose2.io
_
Changelog and Version Scheme
nose2 versions are numbered ``0.MAJOR.MINOR``. Minor releases contain bugfixes or
smaller features. Major features or backwards incompatible changes are done in
major releases.
For a full description of all past versions and changes, see the `changelog`_.
Python Versions
~~~~~~~~~~~~~~~
nose2 requires Python 3.
It supports all versions currently supported by the CPython team, and also aims
to support PyPy and cpython betas.
Python 2
********
Python 2 is no longer supported. The `0.12.x line of releases <py2line>`_
contains the last versions which supported Python 2.
Users of Python 2 should understand that Python 2 is EOL and the Python 2
support line for ``nose2`` is similarly considered EOL.
.. note::
Fixes to 0.12.x may still be accepted on an as-needed basis for a short
while as the python3-only line of releases gets started.
Contributing
------------
If you want to make contributions, please read the `contributing`_ guide.
.. _py2line: https://github.com/nose-devs/nose2/tree/0.12.x-line
.. _differences: https://docs.nose2.io/en/latest/differences.html
.. _changelog: https://docs.nose2.io/en/latest/changelog.html
.. _pytest: http://pytest.readthedocs.io/en/latest/
.. _contributing: https://github.com/nose-devs/nose2/blob/main/contributing.rst
.. _docs.nose2.io: https://docs.nose2.io/en/latest/
FAQs
unittest with plugins
We found that nose2 demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 1 open source maintainer collaborating on the project.
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