Add a form to filter notifications by recipient

Because manually editing the URL isn’t a great user interface, this
commit adds a search field to do this on the user’s behalf.

For this pass at the story it doesn’t do any validation – the user will
just get no results if they search by something which isn’t a phone
number or email address.

If the user navigates to a different ‘bucket’ of notifications (eg
delivered, failed) then the search term is reset, because they’ve
changed the filter which is at a level above the search term.

tests/app/main/views/test_jobs.py

@@ -8,6 +8,7 @@ from bs4 import BeautifulSoup
 
 from app.main.views.jobs import get_time_left, get_status_filters
 from tests import notification_json
+from tests.conftest import SERVICE_ONE_ID
 from freezegun import freeze_time
 
 
@@ -381,6 +382,54 @@ def test_can_show_notifications(
     assert json_content.keys() == {'counts', 'notifications'}
 
 
+@pytest.mark.parametrize("initial_query_arguments, expected_status_field_value, expected_search_box_contents", [
+    (
+        {
+            'message_type': 'sms',
+        },
+        'sending,delivered,failed',
+        '',
+    ),
+    (
+        {
+            'status': 'failed',
+            'message_type': 'email',
+            'page': '99',
+            'to': 'test@example.com',
+        },
+        'failed',
+        'test@example.com',
+    ),
+])
+def test_search_recipient_form(
+    logged_in_client,
+    mock_get_notifications,
+    mock_get_detailed_service,
+    initial_query_arguments,
+    expected_status_field_value,
+    expected_search_box_contents,
+):
+    response = logged_in_client.get(url_for(
+        'main.view_notifications',
+        service_id=SERVICE_ONE_ID,
+        **initial_query_arguments
+    ))
+    assert response.status_code == 200
+    page = BeautifulSoup(response.data.decode('utf-8'), 'html.parser')
+
+    action_url = page.find("form")['action']
+    url = urlparse(action_url)
+    assert url.path == '/services/{}/notifications/{}'.format(
+        SERVICE_ONE_ID,
+        initial_query_arguments['message_type']
+    )
+    query_dict = parse_qs(url.query)
+    assert query_dict == {}
+
+    assert page.find("input", {'name': 'status'})['value'] == expected_status_field_value
+    assert page.find("input", {'name': 'to'})['value'] == expected_search_box_contents
+
+
 def test_should_show_notifications_for_a_service_with_next_previous(
     logged_in_client,
     service_one,