diff --git a/src/server/test/web/readingsCompareMeterQuantity.js b/src/server/test/web/readingsCompareMeterQuantity.js
index 89002d46b..3b1b0fb93 100644
--- a/src/server/test/web/readingsCompareMeterQuantity.js
+++ b/src/server/test/web/readingsCompareMeterQuantity.js
@@ -85,7 +85,19 @@ mocha.describe('readings API', () => {
 					expectCompareToEqualExpected(res, expected);
 				});
 
-				// Add C6 here
+				mocha.it('C6: 28 day shift end 2022-10-31 17:12:34 (partial hour) for 15 minute reading intervals and quantity units & kWh as kWh', async () => {
+					await prepareTest(unitDatakWh, conversionDatakWh, meterDatakWh);
+					const unitId = await getUnitId('kWh');
+					const expected = [108269.924822581, 108889.847659507];
+					const res = await chai.request(app).get(`/api/compareReadings/meters/${METER_ID}`)
+						.query({
+							curr_start: '2022-10-09 00:00:00',
+							curr_end: '2022-10-31 17:12:34', 
+							shift: 'P28D',
+							graphicUnitId: unitId
+						});
+					expectCompareToEqualExpected(res, expected);
+				});
 
 				mocha.it('C8: 1 day shift end 2022-10-31 17:00:00 for 15 minute reading intervals and quantity units & kWh as MJ', async () => {
 					// Use predefined unit and conversion data