Use inclusive when querying for one data point

If the latest and earliest timestamps are identical and the data we are
requesting is not going to be aggregated by a period, we should use the
new `inclusive` query parameter to ensure that we receive the data at
the given timestamp.

backdrop/transformers/dispatch.py

@@ -35,9 +35,14 @@ def get_query_parameters(transform, earliest, latest):
     query_parameters = transform.get('query-parameters', {})
     query_parameters['flatten'] = 'true'
 
-    if earliest == latest and 'period' in query_parameters:
-        query_parameters['duration'] = 1
-        query_parameters['start_at'] = latest.isoformat()
+    if earliest == latest:
+        if 'period' in query_parameters:
+            query_parameters['duration'] = 1
+            query_parameters['start_at'] = latest.isoformat()
+        else:
+            query_parameters['inclusive'] = 'true'
+            query_parameters['start_at'] = earliest.isoformat()
+            query_parameters['end_at'] = latest.isoformat()
     else:
         query_parameters['start_at'] = earliest.isoformat()
         query_parameters['end_at'] = latest.isoformat()

tests/transformers/test_dispatch.py

@@ -138,7 +138,7 @@ def test_run_transform_no_output_group(self, mock_logging_task, mock_data_set, m
 
 class GetQueryParametersTestCase(unittest.TestCase):
 
-    def test_get_query_parameters_same_timestamps(self):
+    def test_same_timestamps_period(self):
         earliest = datetime(2014, 12, 14, 12, 00, 00, tzinfo=pytz.utc)
         latest = datetime(2014, 12, 14, 12, 00, 00, tzinfo=pytz.utc)
         transform = {
@@ -154,3 +154,19 @@ def test_get_query_parameters_same_timestamps(self):
             'duration': 1,
             'start_at': '2014-12-14T12:00:00+00:00',
         }))
+
+    def test_same_timestamps_non_period(self):
+        earliest = datetime(2014, 12, 14, 12, 00, 00, tzinfo=pytz.utc)
+        latest = datetime(2014, 12, 14, 12, 00, 00, tzinfo=pytz.utc)
+        transform = {
+            'query-parameters': {
+            }
+        }
+
+        query_parameters = get_query_parameters(transform, earliest, latest)
+
+        assert_that(query_parameters, has_entries({
+            'start_at': '2014-12-14T12:00:00+00:00',
+            'end_at': '2014-12-14T12:00:00+00:00',
+            'inclusive': 'true',
+        }))