diff --git a/common/net/timed_io_test.go b/common/net/timed_io_test.go
new file mode 100644
index 000000000..ecf8fed81
--- /dev/null
+++ b/common/net/timed_io_test.go
@@ -0,0 +1,20 @@
+package net_test
+
+import (
+	"testing"
+
+	. "github.com/v2ray/v2ray-core/common/net"
+	v2testing "github.com/v2ray/v2ray-core/testing"
+	"github.com/v2ray/v2ray-core/testing/assert"
+)
+
+func TestTimeOutSettings(t *testing.T) {
+	v2testing.Current(t)
+
+	reader := NewTimeOutReader(8, nil)
+	assert.Int(reader.GetTimeOut()).Equals(8)
+	reader.SetTimeOut(8) // no op
+	assert.Int(reader.GetTimeOut()).Equals(8)
+	reader.SetTimeOut(9)
+	assert.Int(reader.GetTimeOut()).Equals(9)
+}