[Python] Moto does not appear to be mocking aws interactions in a pytest

Say I want to mock the following:

session = boto3.Session(profile_name=profile)
resource = session.resource('iam')
iam_users = resource.users.all()
policies = resource.policies.filter(Scope='AWS', OnlyAttached=True, PolicyUsageFilter='PermissionsPolicy')


How do I go about starting to mock this with in pytest? I could create mocked objects by creating a dummy class and the necessary attributes, but I suspect that's the wrong approach.

Some additional details, here's what I'm trying to test out:

def test_check_aws_profile(self, mocker):
mocked_boto3 = mocker.patch('myapp.services.utils.boto3.Session')
mocker.patch(mocked_boto3.client.get_caller_identity.get, return_value='foo-account-id')
assert 'foo-account-id' == my_func('foo')

#in myapp.services.utils.py
def my_func(profile):
session = boto3.Session(profile_name=profile)
client = session.client('sts')
aws_account_number = client.get_caller_identity().get('Account')
return aws_account_number


But I can't quite seem to be able to get this patched correctly. I'm trying to make it so that I can patch session and the function calls in that method

I tried using moto and got this:

@mock_sts
def test_check_aws_profile(self):
session = boto3.Session(profile_name='foo')
client = session.client('sts')
client.get_caller_identity().get('Account')


But I'm running into

> raise ProfileNotFound(profile=profile_name)
E botocore.exceptions.ProfileNotFound: The config profile (foo) could not be found


So it seems like it's not mocking anything :|

Edit:

Turns out you need to have the mocked credentials in a config and credentials file for this to work.

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