routing: move payment session constructor

routing/integrated_routing_context_test.go

@@ -140,18 +140,20 @@ func (c *integratedRoutingContext) testPayment(maxShards uint32) ([]htlcAttempt,
 		MaxShards:      maxShards,
 	}
 
-	session := &paymentSession{
-		getBandwidthHints: getBandwidthHints,
-		payment:           &payment,
-		pathFinder:        findPath,
-		getRoutingGraph: func() (routingGraph, func(), error) {
+	session, err := newPaymentSession(
+		&payment, getBandwidthHints,
+		func() (routingGraph, func(), error) {
 			return c.graph, func() {}, nil
 		},
-		pathFindingConfig: c.pathFindingCfg,
-		missionControl:    mc,
-		minShardAmt:       lnwire.NewMSatFromSatoshis(5000),
+		mc, c.pathFindingCfg,
+	)
+	if err != nil {
+		c.t.Fatal(err)
 	}
 
+	// Override default minimum shard amount.
+	session.minShardAmt = lnwire.NewMSatFromSatoshis(5000)
+
 	// Now the payment control loop starts. It will keep trying routes until
 	// the payment succeeds.
 	var (