make test folder structure align with app folder structure

tests/app/notify_client/test_invite_client.py

@@ -0,0 +1,20 @@
+from app.notify_client.invite_api_client import InviteApiClient
+
+
+def test_client_returns_invite(mocker, sample_invite):
+
+    sample_invite['status'] = 'pending'
+    service_id = sample_invite['service']
+
+    expected_data = {'data': [sample_invite]}
+
+    expected_url = '/service/{}/invite'.format(service_id)
+
+    client = InviteApiClient()
+    mock_get = mocker.patch('app.notify_client.invite_api_client.InviteApiClient.get', return_value=expected_data)
+
+    invites = client.get_invites_for_service(service_id)
+
+    mock_get.assert_called_once_with(expected_url)
+    assert len(invites) == 1
+    assert invites[0].status == 'pending'