Add test

pkg/scheduler/framework/plugins/serviceaffinity/service_affinity_test.go

@@ -599,3 +599,21 @@ func mustGetNodeInfo(t *testing.T, snapshot *cache.Snapshot, name string) *nodei
 	}
 	return nodeInfo
 }
+
+func TestPreFilterDisabled(t *testing.T) {
+	pod := &v1.Pod{}
+	nodeInfo := nodeinfo.NewNodeInfo()
+	node := v1.Node{}
+	nodeInfo.SetNode(&node)
+	p := &ServiceAffinity{
+		args: Args{
+			AffinityLabels: []string{"region"},
+		},
+	}
+	cycleState := framework.NewCycleState()
+	gotStatus := p.Filter(context.Background(), cycleState, pod, nodeInfo)
+	wantStatus := framework.NewStatus(framework.Error, `error reading "PreFilterServiceAffinity" from cycleState: not found`)
+	if !reflect.DeepEqual(gotStatus, wantStatus) {
+		t.Errorf("status does not match: %v, want: %v", gotStatus, wantStatus)
+	}
+}