--- /dev/null
+use gio::NONE_CANCELLABLE;
+use glib::{Bytes, Variant};
+use ostree::{prelude::*, Sign};
+
+#[test]
+fn sign_api_should_work() {
+ let dummy_sign = Sign::get_by_name("dummy").unwrap();
+ assert_eq!(dummy_sign.get_name().unwrap(), "dummy");
+
+ let result = dummy_sign.data(&Bytes::from_static(b"1234"), NONE_CANCELLABLE);
+ assert!(result.is_err());
+
+ let result = dummy_sign.data_verify(&Bytes::from_static(b"1234"), &Variant::from("1234"));
+ assert!(result.is_err());
+
+ let result = Sign::get_by_name("NOPE");
+ assert!(result.is_err());
+}