Test using allocWithZone: as well

Author: madsmtm

objc2/src/macros.rs

@@ -368,6 +368,28 @@ mod tests {
     use super::*;
     use crate::rc::{Allocated, Id, Owned, Shared};
     use crate::runtime::Object;
+    use crate::{Encoding, RefEncode};
+
+    #[repr(C)]
+    struct _NSZone {
+        _inner: [u8; 0],
+    }
+
+    unsafe impl RefEncode for _NSZone {
+        const ENCODING_REF: Encoding<'static> =
+            Encoding::Pointer(&Encoding::Struct("_NSZone", &[]));
+    }
+
+    #[test]
+    fn test_macro_alloc() {
+        let cls = class!(NSObject);
+
+        let _obj: Option<Id<Allocated<Object>, Shared>> = unsafe { msg_send_id![cls, alloc] };
+
+        let zone: *const _NSZone = ptr::null();
+        let _obj: Option<Id<Allocated<Object>, Owned>> =
+            unsafe { msg_send_id![cls, allocWithZone: zone] };
+    }
 
     #[test]
     fn test_macro() {