Nose Test Error

Question

I am using the command

nosetests -v --with-coverage --cover-package=task --cover-erase --cover-html-dir=cover --cover-html --with-xunit task

to run the test cases but in the end after running all the testcases I get the nosetests.xml blank and the following error.

Traceback (most recent call last):
  File "/home/nishant-un/env/bin/nosetests", line 9, in <module>
    load_entry_point('nose==1.0.0', 'console_scripts', 'nosetests')()
  File "/home/nishant-un/env/local/lib/python2.7/site-packages/nose/core.py", line 118, in __init__
    **extra_args)
  File "/usr/lib/python2.7/unittest/main.py", line 95, in __init__
    self.runTests()
  File "/home/nishant-un/env/local/lib/python2.7/site-packages/nose/core.py", line 197, in runTests
    result = self.testRunner.run(self.test)
  File "/home/nishant-un/env/local/lib/python2.7/site-packages/nose/core.py", line 61, in run
    test(result)
  File "/home/nishant-un/env/local/lib/python2.7/site-packages/nose/suite.py", line 176, in __call__
    return self.run(*arg, **kw)
  File "/home/nishant-un/env/local/lib/python2.7/site-packages/nose/suite.py", line 223, in run
    test(orig)
  File "/home/nishant-un/env/local/lib/python2.7/site-packages/nose/suite.py", line 176, in __call__
    return self.run(*arg, **kw)
  File "/home/nishant-un/env/local/lib/python2.7/site-packages/nose/suite.py", line 223, in run
    test(orig)
  File "/home/nishant-un/env/local/lib/python2.7/site-packages/nose/suite.py", line 176, in __call__
    return self.run(*arg, **kw)
  File "/home/nishant-un/env/local/lib/python2.7/site-packages/nose/suite.py", line 223, in run
    test(orig)
  File "/home/nishant-un/env/local/lib/python2.7/site-packages/nose/suite.py", line 176, in __call__
    return self.run(*arg, **kw)
  File "/home/nishant-un/env/local/lib/python2.7/site-packages/nose/suite.py", line 223, in run
    test(orig)
  File "/home/nishant-un/env/local/lib/python2.7/site-packages/nose/suite.py", line 176, in __call__
    return self.run(*arg, **kw)
  File "/home/nishant-un/env/local/lib/python2.7/site-packages/nose/suite.py", line 223, in run
    test(orig)
  File "/home/nishant-un/env/local/lib/python2.7/site-packages/nose/suite.py", line 176, in __call__
    return self.run(*arg, **kw)
  File "/home/nishant-un/env/local/lib/python2.7/site-packages/nose/suite.py", line 223, in run
    test(orig)
  File "/home/nishant-un/env/local/lib/python2.7/site-packages/nose/case.py", line 45, in __call__
    return self.run(*arg, **kwarg)
  File "/home/nishant-un/env/local/lib/python2.7/site-packages/nose/case.py", line 138, in run
    result.addError(self, err)
  File "/home/nishant-un/env/local/lib/python2.7/site-packages/nose/proxy.py", line 118, in addError
    formatted = plugins.formatError(self.test, err)
  File "/home/nishant-un/env/local/lib/python2.7/site-packages/nose/plugins/manager.py", line 94, in __call__
    return self.call(*arg, **kw)
  File "/home/nishant-un/env/local/lib/python2.7/site-packages/nose/plugins/manager.py", line 136, in chain
    result = meth(*arg, **kw)
  File "/home/nishant-un/env/local/lib/python2.7/site-packages/nose/plugins/logcapture.py", line 223, in formatError
    test.capturedLogging = records = self.formatLogRecords()
  File "/home/nishant-un/env/local/lib/python2.7/site-packages/nose/plugins/logcapture.py", line 231, in formatLogRecords
    return [safe_str(format(r)) for r in self.handler.buffer]
  File "/usr/lib/python2.7/logging/__init__.py", line 723, in format
    return fmt.format(record)
  File "/usr/lib/python2.7/logging/__init__.py", line 464, in format
    record.message = record.getMessage()
  File "/usr/lib/python2.7/logging/__init__.py", line 328, in getMessage
    msg = msg % self.args
TypeError: not all arguments converted during string formatting

I have tried almost everything that i found in google. Even deleted .coverage file and all .pyc but it still shows the same error.Any Idea..?

Answer 1

This TypeError is because of mixing different formats.

Your error is inside formatLogRecords()

Instead of:

msg = msg % self.args

You should use format():

myMsg = "{} {} {} {} {}".format(param1, param2, param3, param4)

And even much better approach will be:

args = ['1', '2', '3', '4']
myMsg = (' '.join('{}'.format(k) for k in args))

Result:

>>> 1 2 3 4

That way your args can be with a flexible.

Answer 2

One thing to try is to run nose with no log capturing --nologcapture. Most likely you have a rogue logging somewhere at the import level, and it chokes nose before tests can run. You can usually expose those bugs easily if you just run python task.py on your test files - the error will get thrown immediately.

If this still does not solve your problem, try running nose within python using nose.run() within your test __main__ function, and fire it off with python -m pdb task.py it will let you debug such errors, even if --pdb option in nose does not work.