[Python] Trying to understand mocking in python

using pytest - given the following:

class Bar:
def wtf(self):
return 1
class Foo:
def __init__(self, bar):
self.bar = bar
def huh(self):
return self.bar.wtf()


def test_huh():
bar = Bar()
foo = Foo(bar)
assert foo.huh() == 1

def test_huh2(mocker):
bar = mocker.Mock()
foo = Foo(bar)
bar.wtf().return_value = 1
assert foo.huh() == 1


test_huh does what I expect but I want to test Foo and mock the dependency on Bar.

test_huh2 fails.

it seems the mock does not get called. Can someone explain how this should be done?

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