diff --git a/platformapi/mtpsapi/mtpsapi_test.go b/platformapi/mtpsapi/mtpsapi_test.go
index a38940eb..3b0515b9 100644
--- a/platformapi/mtpsapi/mtpsapi_test.go
+++ b/platformapi/mtpsapi/mtpsapi_test.go
@@ -136,3 +136,12 @@ func TestCheckOrder(t *testing.T) {
 	//}
 	fmt.Println(IsOpen(err))
 }
+
+func TestNumber(t *testing.T) {
+	fmt.Println("1", -2&4 != 0)
+	fmt.Println("2", 0&4 != 0)
+	fmt.Println("3", 1&4 != 0)
+	fmt.Println("4", 2&4 != 0)
+	fmt.Println("5", 4&4 != 0)
+	fmt.Println("6", 5&4 != 0)
+}