Python unittest TypeError

Question

Trying to build an unittest in Python, but I get this TypeError where it says that it misses required potential argument. I've tried everything and end up with this code here:

import unittest
from MyCosine import CosineSim, CosineDis

class TestMyCosine(unittest.TestCase):

    x = [3.5 , 3 , 3.5 , 2.5 , 3]
    y = [3.5 , 3 , 4 , 2.5 , 4.5]
    result = 0.9865867

    def testCosineSim(self, result, x, y):
        self.x = x
        self.y = y
        self.result = result
        self.assertEqual(CosineSim(x,y), result, "0.9865867" )

    def testCosineDis(self, result, x, y):
        self.x = x
        self.y = y
        self.result = result
        self.assertEqual(CosineDis(x,y) , result, "0.9865867")


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

and this is the error message:

======================================================================
ERROR: testCosineDis (__main__.TestMyCosine)
----------------------------------------------------------------------
TypeError: testCosineDis() missing 3 required positional arguments:     'result', 'x', and 'y'

======================================================================
ERROR: testCosineSim (__main__.TestMyCosine)
----------------------------------------------------------------------
TypeError: testCosineSim() missing 3 required positional arguments: 'result', 'x', and 'y'

----------------------------------------------------------------------
Ran 2 tests in 0.000s

FAILED (errors=2)

This is one of the actual functions:

def CosineDis(x,y):
    result = 1 - distance.cosine(x, y)
    return result

What do you think is passing arguments to those methods?

jonrsharpe
– jonrsharpe

2019-03-12 22:28:27 +00:00
Commented Mar 12, 2019 at 22:28 — jonrsharpe
– jonrsharpe, Commented Mar 12, 2019 at 22:28
Correct, you don't even need those arguments there.

Alekhya Vemavarapu
– Alekhya Vemavarapu

2019-03-12 22:34:49 +00:00
Commented Mar 12, 2019 at 22:34 — Alekhya Vemavarapu
– Alekhya Vemavarapu, Commented Mar 12, 2019 at 22:34

niCk cAMel · Accepted Answer · 2019-03-12 23:33:49Z

The scope of where you define x and where you have used x as an input argument is not the same. Since you seem to want to use static values for x, y and result, we can just put them in setUp() which unit test will detect and run before any test method is called.

Quick editing on the phone (haven't tested) :

import unittest
from MyCosine import CosineSim, CosineDis

class TestMyCosine(unittest.TestCase):
    def setUp(self) :
        self.x = [3.5 , 3 , 3.5 , 2.5 , 3]
        self.y = [3.5 , 3 , 4 , 2.5 , 4.5]
        self.result = 0.9865867

    def testCosineSim(self):
        self.assertEqual(CosineSim(self.x,self.y), self.result, "0.9865867" )

    def testCosineDis(self):
        self.assertEqual(CosineDis(self.x,self.y) , self.result, "0.9865867")


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

This worked perfectly, thank you. My test failed :) because the Cosine function returns this value "0.986586764527925" and I only check for seven digit after the comma.

Alan Borsato · Accepted Answer · 2019-03-12 22:35:31Z

That is because the variable you created will be be passed automatically to the TestCase. One solution is to pass the parameters manually. Or you could use a solution like parametrized for that:

from parameterized import parameterized

class TestSequence(unittest.TestCase):
    @parameterized.expand([
        [0.9865867, 3.5, 3.5],
        [0.9865867, 3, 3],
    ])
    def testCosineSim(self, result, x, y):
        self.assertEqual(CosineSim(x,y), result)

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