Fix issue where row_number starts from 3 on a job report download

app/utils.py

@@ -164,8 +164,15 @@ def generate_notifications_csv(**kwargs):
 
 def format_notification_for_csv(notification):
     from app import format_datetime_24h, format_notification_status
+    #  row_number can be 0 so we need to check for it
+    row_num = notification.get('job_row_number')
+    if row_num is not None and row_num >= 0:
+        row_num += 1
+    else:
+        row_num = ''
+
     return {
-        'Row number': int(notification['job_row_number']) + 2 if notification.get('job_row_number') else '',
+        'Row number': row_num,
         'Recipient': notification['to'],
         'Template': notification['template']['name'],
         'Type': notification['template']['template_type'],

tests/app/test_utils.py

@@ -124,3 +124,27 @@ def test_generate_notifications_csv_calls_twice_if_next_link(mocker):
     # mock_calls[0][2] is the kwargs from first call
     assert mock_get_notifications.mock_calls[0][2]['page'] == 1
     assert mock_get_notifications.mock_calls[1][2]['page'] == 2
+
+
+@pytest.mark.parametrize('row_number, expected_result', [
+    (None, ''),
+    (0, '1'),
+    (1, '2'),
+    (300, '301')
+])
+def test_generate_notifications_csv_formats_row_number_correctly(mocker, row_number, expected_result):
+    service_id = '1234'
+    response_with_job_row_zero = notification_json(service_id, rows=1, with_links=True, job_row_number=row_number)
+    mocker.patch(
+        'app.notification_api_client.get_notifications_for_service',
+        side_effect=[
+            response_with_job_row_zero
+        ]
+    )
+
+    csv_content = generate_notifications_csv(service_id=service_id)
+    csv = DictReader(StringIO('\n'.join(csv_content)))
+    csv_rows = list(csv)
+
+    assert len(csv_rows) == 1
+    assert csv_rows[0].get('Row number') == expected_result