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diff --git a/bundles/org.simantics.utils.datastructures/src/org/simantics/utils/datastructures/hints/HintTrackerTest.java b/bundles/org.simantics.utils.datastructures/src/org/simantics/utils/datastructures/hints/HintTrackerTest.java
new file mode 100644
index 000000000..fdcd6b2bc
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+++ b/bundles/org.simantics.utils.datastructures/src/org/simantics/utils/datastructures/hints/HintTrackerTest.java
@@ -0,0 +1,50 @@
+/*******************************************************************************
+ * Copyright (c) 2007, 2010 Association for Decentralized Information Management
+ * in Industry THTH ry.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *     VTT Technical Research Centre of Finland - initial API and implementation
+ *******************************************************************************/
+package org.simantics.utils.datastructures.hints;
+
+import org.simantics.utils.datastructures.hints.IHintContext.Key;
+
+/**
+ * @author Tuukka Lehtonen
+ */
+public class HintTrackerTest extends HintStack {
+
+    public static void main(String[] args) {
+        IHintContext ctx1 = new HintContext();
+        IHintContext ctx2 = new HintContext();
+
+        Key key1 = new IHintContext.KeyOf(Object.class);
+        Key key2 = new IHintContext.KeyOf(Object.class);
+
+        final HintTracker t1 = new HintTracker();
+        final HintTracker t2 = new HintTracker();
+
+        t1.addKeyHintListener(key1, new HintListenerAdapter() {
+            @Override
+            public void hintChanged(IHintObservable sender, Key key, Object oldValue, Object newValue) {
+                System.out.println("secondary tracked hint context changed: " + newValue);
+                t2.track((IHintContext) newValue);
+            }
+        });
+        t2.addKeyHintListener(key2, new HintListenerAdapter() {
+            @Override
+            public void hintChanged(IHintObservable sender, Key key, Object oldValue, Object newValue) {
+                System.out.println("set view input to: " + newValue);
+            }
+        });
+        t1.track(ctx1);
+        
+        ctx1.setHint(key1, ctx2);
+        ctx2.setHint(key2, new Object());
+    }
+
+}
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