res self client post reverse communication-list sub_matter sub_matter

        res = self.client.post(reverse('communication-list'), {
            'sub_matter': sub_matter.pk,
            'subject': 'Test inv',
            'body': 'Test ext emails body',
            'email_recipients': [
                {'email': 'email1@test.com'},
                {'email': 'email2@test.com'},
                {'email': 'email3@test.com'}
            ]
        }, format='json')