Add a test for the ‘available for 7 days’ text

So that we can check it’s still correct when we make it dynamic.

tests/app/main/views/test_jobs.py

@@ -98,6 +98,7 @@ def test_should_show_page_for_one_job(
             status=status_argument
         )
         assert csv_link.text == 'Download this report'
+        assert page.find('span', {'id': 'time-left'}).text == 'Available for 7 days'
         mock_get_notifications.assert_called_with(
             service_one['id'],
             fake_uuid,