htlcswitch: remove Switch reference from channelLink

htlcswitch/link.go

@@ -92,13 +92,6 @@ type ChannelLinkConfig struct {
 	// allowing the link to open and close circuits.
 	Circuits CircuitModifier
 
-	// Switch provides a reference to the HTLC switch, we only use this in
-	// testing to access circuit operations not typically exposed by the
-	// CircuitModifier.
-	//
-	// TODO(conner): remove after refactoring htlcswitch testing framework.
-	Switch *Switch
-
 	// BestHeight returns the best known height.
 	BestHeight func() uint32
 

htlcswitch/link_isolated_test.go

@@ -13,9 +13,10 @@ import (
 type linkTestContext struct {
 	t *testing.T
 
-	aliceLink  ChannelLink
-	bobChannel *lnwallet.LightningChannel
-	aliceMsgs  <-chan lnwire.Message
+	aliceSwitch *Switch
+	aliceLink   ChannelLink
+	bobChannel  *lnwallet.LightningChannel
+	aliceMsgs   <-chan lnwire.Message
 }
 
 // sendHtlcBobToAlice sends an HTLC from Bob to Alice, that pays to a preimage
@@ -39,7 +40,7 @@ func (l *linkTestContext) sendHtlcAliceToBob(htlcID int,
 
 	l.t.Helper()
 
-	circuitMap := l.aliceLink.(*channelLink).cfg.Switch.circuits
+	circuitMap := l.aliceSwitch.circuits
 	fwdActions, err := circuitMap.CommitCircuits(
 		&PaymentCircuit{
 			Incoming: CircuitKey{

htlcswitch/switch_test.go

@@ -5263,10 +5263,12 @@ func testSwitchHandlePacketForward(t *testing.T, zeroConf, private,
 	t.Parallel()
 
 	// Create a link for Alice that we'll add to the switch.
-	aliceLink, _, _, _, _, err :=
+	harness, err :=
 		newSingleLinkTestHarness(t, btcutil.SatoshiPerBitcoin, 0)
 	require.NoError(t, err)
 
+	aliceLink := harness.aliceLink
+
 	s, err := initSwitchWithTempDB(t, testStartingHeight)
 	if err != nil {
 		t.Fatalf("unable to init switch: %v", err)

htlcswitch/test_utils.go

@@ -1129,7 +1129,6 @@ func (h *hopNetwork) createChannelLink(server, peer *mockServer,
 
 	link := NewChannelLink(
 		ChannelLinkConfig{
-			Switch:        server.htlcSwitch,
 			BestHeight:    server.htlcSwitch.BestHeight,
 			FwrdingPolicy: h.globalPolicy,
 			Peer:          peer,