Implement ECMP for unsafe_routes (#1332)

routing/gateway_test.go

@@ -0,0 +1,34 @@
+package routing
+
+import (
+	"net/netip"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestRebalance3_2Split(t *testing.T) {
+	gateways := []Gateway{}
+
+	gateways = append(gateways, Gateway{addr: netip.Addr{}, weight: 10})
+	gateways = append(gateways, Gateway{addr: netip.Addr{}, weight: 5})
+
+	CalculateBucketsForGateways(gateways)
+
+	assert.Equal(t, 1431655764, gateways[0].bucketUpperBound) // INT_MAX/3*2
+	assert.Equal(t, 2147483647, gateways[1].bucketUpperBound) // INT_MAX
+}
+
+func TestRebalanceEqualSplit(t *testing.T) {
+	gateways := []Gateway{}
+
+	gateways = append(gateways, Gateway{addr: netip.Addr{}, weight: 1})
+	gateways = append(gateways, Gateway{addr: netip.Addr{}, weight: 1})
+	gateways = append(gateways, Gateway{addr: netip.Addr{}, weight: 1})
+
+	CalculateBucketsForGateways(gateways)
+
+	assert.Equal(t, 715827882, gateways[0].bucketUpperBound)  // INT_MAX/3
+	assert.Equal(t, 1431655764, gateways[1].bucketUpperBound) // INT_MAX/3*2
+	assert.Equal(t, 2147483647, gateways[2].bucketUpperBound) // INT_MAX
+}