channeldb/addr_test: inspect error string

Lets us match on more than static errors.

channeldb/addr_test.go

@@ -3,6 +3,7 @@ package channeldb
 import (
 	"bytes"
 	"net"
+	"strings"
 	"testing"
 
 	"github.com/lightningnetwork/lnd/tor"
@@ -15,7 +16,7 @@ func (t unknownAddrType) String() string  { return "unknown" }
 
 var addrTests = []struct {
 	expAddr net.Addr
-	serErr  error
+	serErr  string
 }{
 	{
 		expAddr: &net.TCPAddr{
@@ -43,7 +44,7 @@ var addrTests = []struct {
 	},
 	{
 		expAddr: unknownAddrType{},
-		serErr:  ErrUnknownAddressType,
+		serErr:  ErrUnknownAddressType.Error(),
 	},
 }
 
@@ -55,11 +56,21 @@ func TestAddrSerialization(t *testing.T) {
 	var b bytes.Buffer
 	for _, test := range addrTests {
 		err := serializeAddr(&b, test.expAddr)
-		if err != test.serErr {
+		switch {
+		case err == nil && test.serErr != "":
+			t.Fatalf("expected serialization err for addr %v",
+				test.expAddr)
+
+		case err != nil && test.serErr == "":
+			t.Fatalf("unexpected serialization err for addr %v: %v",
+				test.expAddr, err)
+
+		case err != nil && !strings.Contains(err.Error(), test.serErr):
 			t.Fatalf("unexpected serialization err for addr %v, "+
-				"want: %v, got %v",
-				test.expAddr, test.serErr, err)
-		} else if test.serErr != nil {
+				"want: %v, got %v", test.expAddr, test.serErr,
+				err)
+
+		case err != nil:
 			continue
 		}