lnd/routing/route/route_test.go

package route

import (
	"testing"

	"github.com/lightningnetwork/lnd/lnwire"
)

// TestRouteTotalFees checks that a route reports the expected total fee.
func TestRouteTotalFees(t *testing.T) {
	t.Parallel()

	// Make sure empty route returns a 0 fee.
	r := &Route{}
	if r.TotalFees() != 0 {
		t.Fatalf("expected 0 fees, got %v", r.TotalFees())
	}

	// For one-hop routes the fee should be 0, since the last node will
	// receive the full amount.
	amt := lnwire.MilliSatoshi(1000)
	hops := []*Hop{
		{
			PubKeyBytes:      Vertex{},
			ChannelID:        1,
			OutgoingTimeLock: 44,
			AmtToForward:     amt,
		},
	}
	r, err := NewRouteFromHops(amt, 100, Vertex{}, hops)
	if err != nil {
		t.Fatal(err)
	}

	if r.TotalFees() != 0 {
		t.Fatalf("expected 0 fees, got %v", r.TotalFees())
	}

	// Append the route with a node, making the first one take a fee.
	fee := lnwire.MilliSatoshi(100)
	hops = append(hops, &Hop{
		PubKeyBytes:      Vertex{},
		ChannelID:        2,
		OutgoingTimeLock: 33,
		AmtToForward:     amt - fee,
	},
	)

	r, err = NewRouteFromHops(amt, 100, Vertex{}, hops)
	if err != nil {
		t.Fatal(err)
	}

	if r.TotalFees() != fee {
		t.Fatalf("expected %v fees, got %v", fee, r.TotalFees())
	}

}