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Python Python Testing First Steps With Testing Your First unittest Test Case

Nathan Brenner
Nathan Brenner
35,844 Points
Posted by Nathan Brenner
Nathan Brenner
35,844 Points

Long stack track when running 'python -m unittest tests.py'

Running pythong -m unittests tests.py in the shell gives:

Would someone explain what this stacktrace means?

Traceback (most recent call last):
  File "/usr/local/Cellar/python/2.7.12/Frameworks/Python.framework/Versions/2.7/lib/python2.7/runpy.py", line 174, in _run_module_as_main
    "__main__", fname, loader, pkg_name)
  File "/usr/local/Cellar/python/2.7.12/Frameworks/Python.framework/Versions/2.7/lib/python2.7/runpy.py", line 72, in _run_code
    exec code in run_globals
  File "/usr/local/Cellar/python/2.7.12/Frameworks/Python.framework/Versions/2.7/lib/python2.7/unittest/__main__.py", line 12, in <module>
    main(module=None)
  File "/usr/local/Cellar/python/2.7.12/Frameworks/Python.framework/Versions/2.7/lib/python2.7/unittest/main.py", line 94, in __init__
    self.parseArgs(argv)
  File "/usr/local/Cellar/python/2.7.12/Frameworks/Python.framework/Versions/2.7/lib/python2.7/unittest/main.py", line 149, in parseArgs
    self.createTests()
  File "/usr/local/Cellar/python/2.7.12/Frameworks/Python.framework/Versions/2.7/lib/python2.7/unittest/main.py", line 158, in createTests
    self.module)
  File "/usr/local/Cellar/python/2.7.12/Frameworks/Python.framework/Versions/2.7/lib/python2.7/unittest/loader.py", line 130, in loadTestsFromNames
    suites = [self.loadTestsFromName(name, module) for name in names]
  File "/usr/local/Cellar/python/2.7.12/Frameworks/Python.framework/Versions/2.7/lib/python2.7/unittest/loader.py", line 100, in loadTestsFromName
    parent, obj = obj, getattr(obj, part)
AttributeError: 'module' object has no attribute 'py'

Here's the code:

import unittest

import moves


class MoveTests(unittest.TestCase):

    def test_five_plus_five(self):
        assert 5 + 5 == 10

    def test_one_plus_one(self):
        assert not 1 + 1 == 3

if __name__ == '__main__':
    unittest.main()

Running python tests.py gives the expected output. Any idea why the other command doesn't work as expected?

1 Answer

Nathan Brenner
Nathan Brenner
35,844 Points
Nathan Brenner
Nathan Brenner
35,844 Points

Probably should just pay attention to the error message:

AttributeError: 'module' object has no attribute 'py'

I tried running 

python -m unittest tests

and left out the .py file extention, and it worked as expected, which would make sense by the error since the last argument is looking at the attribute of tests, which doesn't exist. Maybe this is just a python 2 thing.