check max tip volume before transfer as well

Author: sanni-t

api/src/opentrons/protocol_api/core/engine/instrument.py

@@ -1008,7 +1008,12 @@ def transfer_liquid(  # noqa: C901
         source_dest_per_volume_step = tx_commons.expand_for_volume_constraints(
             volumes=[volume for _ in range(len(source))],
             targets=zip(source, dest),
-            max_volume=self.get_max_volume(),
+            max_volume=min(
+                self.get_max_volume(),
+                tip_racks[0][1]
+                .get_well_core("A1")
+                .get_max_volume(),  # Assuming all tips in tiprack are of same volume
+            ),
         )
 
         def _drop_tip() -> None:

api/tests/opentrons/protocol_api_integration/test_transfer_with_liquid_classes.py

@@ -27,8 +27,8 @@ def test_water_transfer_with_volume_more_than_tip_max(
     tiprack = simulated_protocol_context.load_labware(
         "opentrons_flex_96_tiprack_50ul", "D1"
     )
-    pipette_50 = simulated_protocol_context.load_instrument(
-        "flex_1channel_50", mount="left", tip_racks=[tiprack]
+    pipette_1k = simulated_protocol_context.load_instrument(
+        "flex_1channel_1000", mount="left", tip_racks=[tiprack]
     )
     nest_plate = simulated_protocol_context.load_labware(
         "nest_96_wellplate_200ul_flat", "C3"
@@ -47,7 +47,7 @@ def test_water_transfer_with_volume_more_than_tip_max(
         mock_manager = mock.Mock()
         mock_manager.attach_mock(patched_pick_up_tip, "pick_up_tip")
 
-        pipette_50.transfer_liquid(
+        pipette_1k.transfer_liquid(
             liquid_class=water,
             volume=60,
             source=nest_plate.rows()[0],
@@ -58,7 +58,7 @@ def test_water_transfer_with_volume_more_than_tip_max(
         assert patched_pick_up_tip.call_count == 24
         patched_pick_up_tip.reset_mock()
 
-        pipette_50.transfer_liquid(
+        pipette_1k.transfer_liquid(
             liquid_class=water,
             volume=100,
             source=nest_plate.rows()[0],
@@ -69,16 +69,16 @@ def test_water_transfer_with_volume_more_than_tip_max(
         assert patched_pick_up_tip.call_count == 12
         patched_pick_up_tip.reset_mock()
 
-        pipette_50.pick_up_tip()
-        pipette_50.transfer_liquid(
+        pipette_1k.pick_up_tip()
+        pipette_1k.transfer_liquid(
             liquid_class=water,
             volume=50,
             source=nest_plate.rows()[0],
             dest=arma_plate.rows()[0],
             new_tip="never",
             trash_location=trash,
         )
-        pipette_50.drop_tip()
+        pipette_1k.drop_tip()
         assert patched_pick_up_tip.call_count == 1