Question

Here is the def of the function I’m testing:

def runCMD(cmd,subString=-1,stripSlashes=True,getReturnCode=False):

Here is my test class

import unittest
from class_backups import *

class tests_backups(unittest.TestCase):

    def test_runCMD(self):
        cLInstance = class_backups()
        assert(cLInstance.runCMD("ls",-1,True,True)==0)

# When this module is executed from the command-line, run all its tests
unittest.main()

Here is my error:

E
======================================================================
ERROR: test_runCMD (__main__.tests_backups)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "tests_backups.py", line 11, in test_runCMD
    assert(cLInstance.runCMD("ls",-1,True,True)==0)
TypeError: runCMD() takes at most 4 arguments (5 given)
----------------------------------------------------------------------
Ran 1 tests in 0.000s

FAILED (errors=1)

What am I doing wrong? Is there an implicit 5th argument? is it self?

Answer 1

I would say that the runCMD method is missing self as the first argument.

Since it’s a bound instance method, Python is sending the instance as the first argument implicitly and that’s why your seeing 5 arguments being passed.