fix(shared-data): fix well util for partial-column 8-channel (#16458)

shared-data/js/helpers/__tests__/wellSets.test.ts

@@ -421,27 +421,27 @@ describe('getWellSetForMultichannel with pipetteNozzleDetails', () => {
   it('returns partial column for 8-channel pipette with partial column config', () => {
     const result = getWellSetForMultichannel({
       labwareDef: labwareDef,
-      wellName: 'C1',
+      wellName: 'G1',
       channels: 8,
       pipetteNozzleDetails: {
         nozzleConfig: 'column',
         activeNozzleCount: 4,
       },
     })
-    expect(result).toEqual(['C1', 'D1', 'E1', 'F1'])
+    expect(result).toEqual(['D1', 'E1', 'F1', 'G1'])
   })
 
   it('handles edge cases for 8-channel partial column selection', () => {
-    const bottomEdgeResult = getWellSetForMultichannel({
+    const result = getWellSetForMultichannel({
       labwareDef: labwareDef,
-      wellName: 'G1',
+      wellName: 'C1',
       channels: 8,
       pipetteNozzleDetails: {
         nozzleConfig: 'column',
         activeNozzleCount: 4,
       },
     })
-    expect(bottomEdgeResult).toEqual(['G1', 'H1'])
+    expect(result).toEqual(['A1', 'B1', 'C1'])
   })
 
   it('returns full plate for 96-channel pipette with no config', () => {

shared-data/js/helpers/wellSets.ts

@@ -111,6 +111,8 @@ export const makeWellSetHelpers = (): WellSetHelpers => {
     return wellSetByPrimaryWell
   }
 
+  // TODO(jh 10-10-24): The partial tip logic is strongly coupled to lower-level partial tip API changes.
+  //  Consider alternative methods for deriving well sets when in partial nozzle configurations.
   const getWellSetForMultichannel = ({
     labwareDef,
     wellName,
@@ -142,7 +144,10 @@ export const makeWellSetHelpers = (): WellSetHelpers => {
       const wellIndex = targetColumn.indexOf(wellName)
 
       // If there are fewer wells than active nozzles, only select as many wells as there are nozzles.
-      return targetColumn.slice(wellIndex, wellIndex + activeNozzleCount)
+      return targetColumn.slice(
+        Math.max(wellIndex - activeNozzleCount + 1, 0),
+        wellIndex + 1
+      )
     }
 
     if (channels === 8) {