diff --git a/sm4/arm64_verify_test.go b/sm4/arm64_verify_test.go
index c091871..58a8c9a 100644
--- a/sm4/arm64_verify_test.go
+++ b/sm4/arm64_verify_test.go
@@ -6,5 +6,11 @@ func tblAsm(in, imm, out *byte)
 
 func TestTblAsm(t *testing.T) {
 	in := []byte{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15}
+	imm := []byte{15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0}
 
+	out := make([]byte, 16)
+	tblAsm(&in[0], &imm[0], &out[0])
+	if !reflect.DeepEqual(out, imm) {
+		t.Errorf("expected=%v, result=%v\n", imm, out)
+	}
 }
\ No newline at end of file