Index: firmware/App/Services/Reservoirs.c
===================================================================
diff -u -rcb4d35cc50df2d3cc9e828cd92e53cf456ca9b9d -r1f1b53030a930c542646d9d88c7db0c3a945f150
--- firmware/App/Services/Reservoirs.c	(.../Reservoirs.c)	(revision cb4d35cc50df2d3cc9e828cd92e53cf456ca9b9d)
+++ firmware/App/Services/Reservoirs.c	(.../Reservoirs.c)	(revision 1f1b53030a930c542646d9d88c7db0c3a945f150)
@@ -7,8 +7,8 @@
 *
 * @file    Reservoirs.c
 *
-* @author  (last)      Dara Navaei
-* @date    (last)      03-Aug-2022
+* @author  (last)      Michael Garthwaite
+* @date    (last)      08-Aug-2022
 *
 * @author  (original)  Sean
 * @date    (original)  18-Mar-2020
@@ -1061,4 +1061,32 @@
     return result;
 }
 
+/*********************************************************************//**
+ * @brief
+ * The testTareReservoir function tares a given reservoir.  It is assumed
+ * that the given reservoir has already been drained.
+ * @details Inputs: drainVolumeTargetMl
+ * @details Outputs: drainVolumeTargetMl
+ * @param value ID of reservoir to tare
+ * @return TRUE if tare successful, FALSE if not
+ *************************************************************************/
+BOOL testTareReservoir( U32 value )
+{
+    BOOL result = FALSE;
+
+    if ( TRUE == isTestingActivated() )
+    {
+        if ( value < NUM_OF_DG_RESERVOIRS )
+        {
+            result = TRUE;
+            tareLoadCellRequest = TRUE;
+            testSetReservoirDrainVolumeMlOverride( 0 );
+            tareLoadCellsAtEmpty( (DG_RESERVOIR_ID_T)value );
+            testResetReservoirDrainVolumeMlOverride();
+        }
+    }
+
+    return result;
+}
+
 /**@}*/