def test_clean_username(self) -> None:
# A user with proto_user params does not exist yet.
proto_user = UserFactory.build()
form = UserCreationForm({
"username": proto_user.username,
"password1": proto_user._password,
"password2": proto_user._password,
})
assert form.is_valid()
assert form.clean_username() == proto_user.username
# Creating a user.
form.save()
# The user with proto_user params already exists,
# hence cannot be created.
form = UserCreationForm({
"username": proto_user.username,
"password1": proto_user._password,
"password2": proto_user._password,
})
assert not form.is_valid()
assert len(form.errors) == 1
assert "username" in form.errors
