[libgee] Fix read-only view unique instance test

[Didier 'Ptitjes' Villevalois <dvillevalois src gnome org>]

commit 01388b3abfff3f4ac513896004c78555a303194b
Author: Didier 'Ptitjes <ptitjes free fr>
Date:   Mon Sep 14 23:06:14 2009 +0200

    Fix read-only view unique instance test

 tests/testreadonlycollection.vala |    7 +++----
 1 files changed, 3 insertions(+), 4 deletions(-)
---
diff --git a/tests/testreadonlycollection.vala b/tests/testreadonlycollection.vala
index f18ee31..6340abc 100644
--- a/tests/testreadonlycollection.vala
+++ b/tests/testreadonlycollection.vala
@@ -44,15 +44,14 @@ public abstract class ReadOnlyCollectionTests : Gee.TestCase {
 		var another_ro_collection = test_collection.read_only_view;
 		assert (ro_collection == another_ro_collection);
 
-		weak Collection<string> saved_instance = ro_collection;
-		long instance_address = (long) saved_instance;
-		assert (instance_address == (long) another_ro_collection);
+		ro_collection.set_data ("marker", new Object ());
+		assert (another_ro_collection.get_data ("marker") != null);
 
 		another_ro_collection = null;
 		ro_collection = null;
 
 		another_ro_collection = test_collection.read_only_view;
-		assert (instance_address != (long) another_ro_collection);
+		assert (another_ro_collection.get_data ("marker") == null);
 	}
 
 	public void test_add () {