How to test that a method gets called twice with different arguments in Python unittest - python-unittest

Question

Say I have a method that looks like this:
from otherModule import B
def A():
for pair in [[1, 2], [3, 4]]:
B(*pair)
and I have a test that looks like:
class TestA(unittest.TestCase):
#patch("moduleA.B")
def test_A(self, mockB):
A()
mockB.assert_has_calls([
call(1, 2),
call(3, 4)
])
For some reason I get an AssertionError: Calls not found. because it only registers teh call with 3,4 twice. Does what I'm doing look right?

Answer 1

It works fine, can't reproduce the error.
E.g.
moduleA.py:
from otherModule import B
def A():
for pair in [[1, 2], [3, 4]]:
B(*pair)
otherModule.py:
def B(x, y):
print(x, y)
test_moduleA.py:
import unittest
from unittest.mock import patch, call
from moduleA import A
class TestA(unittest.TestCase):
#patch("moduleA.B")
def test_A(self, mockB):
A()
mockB.assert_has_calls([
call(1, 2),
call(3, 4)
])
if __name__ == '__main__':
unittest.main()
unit test results with coverage report:
.
----------------------------------------------------------------------
Ran 1 test in 0.001s
OK
Name Stmts Miss Cover Missing
--------------------------------------------------------------------------
src/stackoverflow/59179990/moduleA.py 4 0 100%
src/stackoverflow/59179990/otherModule.py 2 1 50% 2
src/stackoverflow/59179990/test_moduleA.py 9 0 100%
--------------------------------------------------------------------------
TOTAL 15 1 93%
Python version: Python 3.7.5