Added test for DefaultListenAddrs

libp2p_test.go

@@ -8,6 +8,7 @@ import (
 
 	crypto "github.com/libp2p/go-libp2p-crypto"
 	host "github.com/libp2p/go-libp2p-host"
+	"github.com/libp2p/go-tcp-transport"
 )
 
 func TestNewHost(t *testing.T) {
@@ -39,6 +40,39 @@ func TestInsecure(t *testing.T) {
 	h.Close()
 }
 
+func TestDefaultListenAddrs(t *testing.T) {
+	ctx := context.Background()
+
+	// Test 1: Listen addr should not set if user defined transport is passed.
+	h, err := New(
+		ctx,
+		Transport(tcp.TcpTransport{}),
+	)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if len(h.Addrs()) != 0 {
+		t.Error("expected zero listen addrs as none is set with user defined transport")
+	}
+	h.Close()
+
+	// Test 2: User defined listener addrs should overwrite the default options.
+	h, err = New(
+		ctx,
+		Transport(tcp.TcpTransport{}),
+		ListenAddrStrings("/ip4/127.0.0.1/tcp/0"),
+	)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if len(h.Addrs()) != 1 {
+		t.Error("expected one listen addr")
+	}
+	h.Close()
+}
+
 func makeRandomHost(t *testing.T, port int) (host.Host, error) {
 	ctx := context.Background()
 	priv, _, err := crypto.GenerateKeyPair(crypto.RSA, 2048)