Add API client for notifications

This commit adds an API client for the notifications endpoints added in:
https://github.com/alphagov/notifications-api/pull/113

app/notify_client/notification_api_client.py

@@ -0,0 +1,37 @@
+from notifications_python_client.base import BaseAPIClient
+
+
+class NotificationApiClient(BaseAPIClient):
+    def __init__(self, base_url=None, client_id=None, secret=None):
+        super(self.__class__, self).__init__(base_url=base_url or 'base_url',
+                                             client_id=client_id or 'client_id',
+                                             secret=secret or 'secret')
+
+    def init_app(self, app):
+        self.base_url = app.config['API_HOST_NAME']
+        self.client_id = app.config['ADMIN_CLIENT_USER_NAME']
+        self.secret = app.config['ADMIN_CLIENT_SECRET']
+
+    def get_all_notifications(self, page=None):
+        params = {}
+        if page is not None:
+            params['page'] = page
+        return self.get(
+            url='/notifications',
+            params=params
+        )
+
+    def get_notifications_for_service(self, service_id, job_id=None, page=None):
+        params = {}
+        if page is not None:
+            params['page'] = page
+        if job_id:
+            return self.get(
+                url='/service/{}/job/{}/notifications'.format(service_id, job_id),
+                params=params
+            )
+        else:
+            return self.get(
+                url='/service/{}/notifications'.format(service_id),
+                params=params
+            )

tests/app/main/notify_client/test_notification_client.py

@@ -0,0 +1,41 @@
+import pytest
+from app.notify_client.notification_api_client import NotificationApiClient
+
+
+def test_client_gets_notifications(mocker):
+
+    mock_get = mocker.patch('app.notify_client.notification_api_client.NotificationApiClient.get')
+    NotificationApiClient().get_all_notifications()
+    mock_get.assert_called_once_with(url='/notifications', params={})
+
+
+def test_client_gets_notifications_with_page(mocker):
+
+    mock_get = mocker.patch('app.notify_client.notification_api_client.NotificationApiClient.get')
+    NotificationApiClient().get_all_notifications(page=99)
+    mock_get.assert_called_once_with(url='/notifications', params={'page': 99})
+
+
+@pytest.mark.parametrize("arguments,expected_call", [
+    (
+        {},
+        {'url': '/service/abcd1234/notifications', 'params': {}}
+    ),
+    (
+        {'page': 99},
+        {'url': '/service/abcd1234/notifications', 'params': {'page': 99}}
+    ),
+    (
+        {'job_id': 'efgh5678'},
+        {'url': '/service/abcd1234/job/efgh5678/notifications', 'params': {}}
+    ),
+    (
+        {'job_id': 'efgh5678', 'page': 48},
+        {'url': '/service/abcd1234/job/efgh5678/notifications', 'params': {'page': 48}}
+    )
+])
+def test_client_gets_notifications_for_service_and_job_by_page(mocker, arguments, expected_call):
+
+    mock_get = mocker.patch('app.notify_client.notification_api_client.NotificationApiClient.get')
+    NotificationApiClient().get_notifications_for_service('abcd1234', **arguments)
+    mock_get.assert_called_once_with(**expected_call)