How to use the sparkpost.transmissions.Transmissions function in sparkpost

def test_fail_silently():
    # should not raise
    with mock.patch.object(Transmissions, 'send') as mock_send:
        mock_send.side_effect = Exception('i should not be raised')
        mailer(get_params({'fail_silently': True}))

    # should raise
    with mock.patch.object(Transmissions, 'send') as mock_send:
        mock_send.side_effect = Exception('i should be raised')
        with pytest.raises(Exception):
            mailer(get_params())

api_key = self.get_api_key()
            if not api_key:
                raise SparkPostException("No API key. Improve message.")

        self.base_uri = 'https://' + base_uri + '/api/v' + version
        self.api_key = api_key

        self.metrics = Metrics(self.base_uri, self.api_key,
                               self.TRANSPORT_CLASS)
        self.recipient_lists = RecipientLists(self.base_uri, self.api_key,
                                              self.TRANSPORT_CLASS)
        self.suppression_list = SuppressionList(self.base_uri, self.api_key,
                                                self.TRANSPORT_CLASS)
        self.templates = Templates(self.base_uri, self.api_key,
                                   self.TRANSPORT_CLASS)
        self.transmissions = Transmissions(self.base_uri, self.api_key,
                                           self.TRANSPORT_CLASS)
        # Keeping self.transmission for backwards compatibility.
        # Will be removed in a future release.
        self.transmission = self.transmissions