test: add max valid/invalid generalized time

Author: dishmaker

der/src/asn1/generalized_time.rs

@@ -347,4 +347,52 @@ mod tests {
         utc_time.encode(&mut encoder).unwrap();
         assert_eq!(example_bytes, encoder.finish().unwrap());
     }
+
+    #[test]
+    fn max_valid_generalized_time() {
+        let example_bytes = "\x18\x0f99991231235959Z".as_bytes();
+        let utc_time = GeneralizedTime::from_der(&example_bytes).unwrap();
+        assert_eq!(utc_time.to_unix_duration().as_secs(), 253402300799);
+
+        let mut buf = [0u8; 128];
+        let mut encoder = SliceWriter::new(&mut buf);
+        utc_time.encode(&mut encoder).unwrap();
+        assert_eq!(example_bytes, encoder.finish().unwrap());
+    }
+
+    #[test]
+    fn invalid_year_generalized_time() {
+        let example_bytes = "\x18\x0f999@1231235959Z".as_bytes();
+        assert!(GeneralizedTime::from_der(&example_bytes).is_err());
+    }
+
+    #[test]
+    fn invalid_month_generalized_time() {
+        let example_bytes = "\x18\x0f99991331235959Z".as_bytes();
+        assert!(GeneralizedTime::from_der(&example_bytes).is_err());
+    }
+
+    #[test]
+    fn invalid_day_generalized_time() {
+        let example_bytes = "\x18\x0f99991232235959Z".as_bytes();
+        assert!(GeneralizedTime::from_der(&example_bytes).is_err());
+    }
+
+    #[test]
+    fn invalid_hour_generalized_time() {
+        let example_bytes = "\x18\x0f99991231245959Z".as_bytes();
+        assert!(GeneralizedTime::from_der(&example_bytes).is_err());
+    }
+
+    #[test]
+    fn invalid_minute_generalized_time() {
+        let example_bytes = "\x18\x0f99991231236059Z".as_bytes();
+        assert!(GeneralizedTime::from_der(&example_bytes).is_err());
+    }
+
+    #[test]
+    fn invalid_second_generalized_time() {
+        let example_bytes = "\x18\x0f99991231235960Z".as_bytes();
+        assert!(GeneralizedTime::from_der(&example_bytes).is_err());
+    }
 }