Link to notification from API integration

It’s useful to be able to see what the email or text message looks like,
especially if you’ve sent it with a test API key (so it isn’t in your
inbox or on your phone). We already have the page for this, so we just
need to link to it.

tests/app/main/views/test_api_integration.py

@@ -70,27 +70,26 @@ def test_should_show_api_page_with_no_notifications(
     assert 'When you send messages via the API they’ll appear here.' in rows[len(rows) - 1].text.strip()
 
 
-@pytest.mark.parametrize('template_type, has_links', [
-    ('sms', False),
-    ('letter', True),
+@pytest.mark.parametrize('template_type, link_text', [
+    ('sms', 'View text message'),
+    ('letter', 'View letter'),
+    ('email', 'View email'),
 ])
 def test_letter_notifications_should_have_link_to_view_letter(
     client_request,
     api_user_active,
-    fake_uuid,
     mock_has_permissions,
     mocker,
     template_type,
-    has_links
+    link_text,
 ):
     mock_get_notifications(mocker, api_user_active, diff_template_type=template_type)
-
     page = client_request.get(
         'main.api_integration',
-        service_id=fake_uuid,
+        service_id=SERVICE_ONE_ID,
     )
 
-    assert (page.select_one('details a') is not None) == has_links
+    assert page.select_one('details a').text.strip() == link_text
 
 
 @pytest.mark.parametrize('status', [