diff --git a/hook_test.go b/hook_test.go
index 30d87e7..d9540d5 100644
--- a/hook_test.go
+++ b/hook_test.go
@@ -13,3 +13,11 @@ func TestAdd(t *testing.T) {
 	e := Start()
 	tt.NotNil(t, e)
 }
+
+func TestKey(t *testing.T) {
+	k := RawcodetoKeychar(0)
+	tt.Equal(t, "error", k)
+
+	r := KeychartoRawcode("error")
+	tt.Equal(t, 0, r)
+}