Fix test

op-service/client/dial.go

@@ -18,7 +18,7 @@ import (
 // DefaultDialTimeout is a default timeout for dialing a client.
 const DefaultDialTimeout = 30 * time.Second
 const defaultRetryCount = 30
-const defaultRetryTime = 1 * time.Second
+const defaultRetryTime = 1_500 * time.Millisecond
 
 // DialEthClientWithTimeout attempts to dial the L1 provider using the provided
 // URL. If the dial doesn't complete within defaultDialTimeout seconds, this

op-service/client/dial_test.go

 package client
 
 import (
-	"net/http"
+	"fmt"
+	"net"
+	"strings"
 	"testing"
 
 	"github.com/stretchr/testify/require"
 )
 
 func TestIsURLAvailable(t *testing.T) {
-	go func() {
-		_ = http.ListenAndServe(":8989", nil)
-	}()
+	listener, err := net.Listen("tcp4", ":0")
+	require.NoError(t, err)
+	defer listener.Close()
 
-	require.True(t, IsURLAvailable("http://localhost:8989"))
-	require.False(t, IsURLAvailable("http://localhost:9898"))
+	a := listener.Addr().String()
+	parts := strings.Split(a, ":")
+	addr := fmt.Sprintf("http://localhost:%s", parts[1])
+
+	require.True(t, IsURLAvailable(addr))
+	require.False(t, IsURLAvailable("http://localhost:0"))
 }