Implemented the post email notifications endpoint for v2

tests/app/v2/notifications/test_post_notifications.py

@@ -1,7 +1,7 @@
 import uuid
 
+import pytest
 from flask import json
-
 from app.models import Notification
 from tests import create_authorization_header
 
@@ -102,3 +102,55 @@ def test_post_sms_notification_returns_400_and_for_schema_problems(notify_api, s
             assert error_resp['errors'] == [{'error': 'ValidationError',
                                              'message': "template_id is a required property"
                                              }]
+
+
+def test_post_email_notification_returns_201(client, sample_email_template, mocker):
+    mocked = mocker.patch('app.celery.provider_tasks.deliver_email.apply_async')
+    data = {
+        "reference": "reference from caller",
+        "email_address": sample_email_template.service.users[0].email_address,
+        "template_id": sample_email_template.id,
+    }
+    auth_header = create_authorization_header(service_id=sample_email_template.service_id)
+    response = client.post(
+        path="v2/notifications/email",
+        data=json.dumps(data),
+        headers=[('Content-Type', 'application/json'), auth_header])
+    assert response.status_code == 201
+    resp_json = json.loads(response.get_data(as_text=True))
+    notifications = Notification.query.all()
+    assert len(notifications) == 1
+    notification_id = notifications[0].id
+    assert resp_json['id'] is not None
+    assert resp_json['reference'] is None
+    assert resp_json['content']['body'] == sample_email_template.content
+    assert resp_json['content']['subject'] == sample_email_template.subject
+    assert resp_json['content']['from_email'] == sample_email_template.service.email_from
+    assert 'v2/notifications/{}'.format(notification_id) in resp_json['uri']
+    assert resp_json['template']['id'] == str(sample_email_template.id)
+    assert resp_json['template']['version'] == sample_email_template.version
+    assert 'v2/templates/{}'.format(sample_email_template.id) in resp_json['template']['uri']
+    assert mocked.called
+
+
+def test_post_email_notification_returns_404_and_missing_template(notify_api, sample_service):
+    with notify_api.test_request_context():
+        with notify_api.test_client() as client:
+            data = {
+                "email_address": sample_service.users[0].email_address,
+                'template_id': str(uuid.uuid4())
+            }
+            auth_header = create_authorization_header(service_id=sample_service.id)
+
+            response = client.post(
+                path='/v2/notifications/email',
+                data=json.dumps(data),
+                headers=[('Content-Type', 'application/json'), auth_header])
+
+            assert response.status_code == 400
+            assert response.headers['Content-type'] == 'application/json'
+
+            error_json = json.loads(response.get_data(as_text=True))
+            assert error_json['status_code'] == 400
+            assert error_json['errors'] == [{"error": "BadRequestError",
+                                             "message": 'Template not found'}]