check that we fail to decrypt with the wrong key

src/olm/account/mod.rs

@@ -1479,4 +1479,29 @@ mod test {
 
         Ok(())
     }
+
+    #[test]
+    fn fails_to_rehydrate_with_wrong_key() -> Result<()> {
+        let mut alice = Account::new();
+
+        alice.generate_one_time_keys(alice.max_number_of_one_time_keys());
+        alice.generate_fallback_key();
+
+        let alice_dehydrated =
+            alice.to_dehydrated_device(&PICKLE_KEY).expect("Should be able to dehydrate device");
+
+        assert!(Account::from_dehydrated_device(
+            &alice_dehydrated,
+            &alice.curve25519_key().to_base64(),
+            &[1; 32],
+        ).is_err());
+
+        assert!(Account::from_dehydrated_device(
+            &alice_dehydrated,
+            &"WrongDeviceID",
+            &PICKLE_KEY,
+        ).is_err());
+
+        Ok(())
+    }
 }