problem in using unittest

[akbarza]

hi
I have the two below codes:

#one.py
def add(x,y):
    return x+y
    
def subtract(x,y) :
    return x-y
    
def   multiply(x,y):
    return x*y
    
def division(x,y) :
    if y==0 :
        raise ZeroDIvisionErorr ("can't division by zero...")   
    return x/y
    

and the below test_one.py:

#test_one.py
'''
for test one.py with using unittest.
'''

import unittest
import one

class oneTest(unittest.TestCase):
    def test_add(self):
        self.assertEqual(one.add(4,5),9)
        self.assertEqual(one.add(-1,4),3)
        
    def test_subtract(self):
        self.assertEqual(one.subtract(5,0),5)
        
    def test_multiply(self):
        self.assertEqual(one.multiply(4,5),20)   
        self.assertEqual(one.multiply(7,0),0)
        
    def   test_division(self):
        self.assertEqual(one.division(30,5),6)
        self.assertRaises(ZeroDivisionError,one.division,4,0)
        
        
if __name__=='__main__'  :
     unittest.main

after that, when I wrote in cmd: D:\Desktop\pypypy>python -m unittest test_one.py
the below error was appeared:

Error:
.E..
======================================================================
ERROR: test_division (test_one.oneTest)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "D:\Desktop\pypypy\test_one.py", line 23, in test_division
    self.assertRaises(ZeroDivisionError,one.division,4,0)
  File "C:\Program Files (x86)\Thonny\lib\unittest\case.py", line 738, in assertRaises
    return context.handle('assertRaises', args, kwargs)
  File "C:\Program Files (x86)\Thonny\lib\unittest\case.py", line 201, in handle
    callable_obj(*args, **kwargs)
  File "D:\Desktop\pypypy\one.py", line 12, in division
    raise ZeroDIvisionErorr ("can't division by zero...")
NameError: name 'ZeroDIvisionErorr' is not defined

----------------------------------------------------------------------
Ran 4 tests in 0.004s

FAILED (errors=1)

D:\Desktop\pypypy>'''

what is the problem?
thanks

[Gribouillis]

what is the problem?

ZeroDIvisionErorr is different from ZeroDivisionError

[deanhystad]

ZeroDIvisionError is not defined. Carefully check the case.