diff --git a/internal/syncx/mutex_test.go b/internal/syncx/mutex_test.go
new file mode 100644
index 0000000000..6a6370d562
--- /dev/null
+++ b/internal/syncx/mutex_test.go
@@ -0,0 +1,34 @@
+package syncx
+
+import (
+	"context"
+	"fmt"
+	"sync"
+	"testing"
+	"time"
+)
+
+func TestCancel(t *testing.T) {
+	t.Skip("not a good test, also time-consuming")
+	mu := NewClosableMutex()
+	var wg sync.WaitGroup
+	wg.Add(3)
+	waiter := func(id int, waitTime time.Duration) {
+		defer wg.Done()
+		ctx, _ := context.WithTimeout(context.Background(), waitTime)
+		if mu.TryLockWithContext(ctx) {
+			fmt.Printf("%d. Sleeping\n", id)
+			time.Sleep(10 * time.Second)
+			fmt.Printf("%d. Waking\n", id)
+			mu.Unlock()
+		} else {
+			fmt.Printf("%d. Cancelling\n", id)
+		}
+	}
+
+	go waiter(1, 5*time.Second)
+	time.Sleep(100 * time.Millisecond)
+	go waiter(2, 5*time.Second)
+	go waiter(3, 15*time.Second)
+	wg.Wait()
+}