feat: add uTLS support in measurexlite (#918)

Closes https://github.com/ooni/probe/issues/2253 

Co-authored-by: decfox <decfox@github.com>

internal/measurexlite/utls_test.go

@@ -0,0 +1,29 @@
+package measurexlite
+
+import (
+	"testing"
+	"time"
+
+	"github.com/ooni/probe-cli/v3/internal/model"
+	"github.com/ooni/probe-cli/v3/internal/model/mocks"
+	utls "gitlab.com/yawning/utls.git"
+)
+
+func TestNewTLSHandshakerUTLS(t *testing.T) {
+	t.Run("NewTLSHandshakerUTLS creates a wrapped TLSHandshaker", func(t *testing.T) {
+		underlying := &mocks.TLSHandshaker{}
+		zeroTime := time.Now()
+		trace := NewTrace(0, zeroTime)
+		trace.NewTLSHandshakerUTLSFn = func(dl model.DebugLogger, id *utls.ClientHelloID) model.TLSHandshaker {
+			return underlying
+		}
+		thx := trace.NewTLSHandshakerUTLS(model.DiscardLogger, &utls.HelloGolang)
+		thxt := thx.(*tlsHandshakerTrace)
+		if thxt.thx != underlying {
+			t.Fatal("invalid TLS handshaker")
+		}
+		if thxt.tx != trace {
+			t.Fatal("invalid trace")
+		}
+	})
+}