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diff --git a/bundles/org.simantics.utils.datastructures/src/org/simantics/utils/datastructures/hints/HintStackTest.java b/bundles/org.simantics.utils.datastructures/src/org/simantics/utils/datastructures/hints/HintStackTest.java
new file mode 100644
index 000000000..c6caa8a9c
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+++ b/bundles/org.simantics.utils.datastructures/src/org/simantics/utils/datastructures/hints/HintStackTest.java
@@ -0,0 +1,69 @@
+/*******************************************************************************
+ * 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
+ *******************************************************************************/
+/*
+ *
+ * @author Toni Kalajainen
+ */
+package org.simantics.utils.datastructures.hints;
+
+import org.simantics.utils.datastructures.hints.IHintContext.Key;
+import org.simantics.utils.datastructures.hints.IHintContext.KeyOf;
+
+public class HintStackTest {
+
+	public static final Key KEY = new KeyOf(Double.class);
+	
+	/**
+	 * @param args
+	 */
+	public static void main(String[] args) {
+		IHintStack stack = new HintStack();
+		stack.addHintListener(new IHintListener() {
+			@Override
+			public void hintChanged(IHintObservable sender, Key key,
+					Object oldValue, Object newValue) {
+				System.out.println("Hint changed: "+key+"="+newValue+" (was "+oldValue+")");
+			}
+
+			@Override
+			public void hintRemoved(IHintObservable sender, Key key,
+					Object oldValue) {
+				System.out.println("Hint removed: "+key+" (was "+oldValue+")");
+			}});
+		IHintContext c1 = new HintContext();
+		IHintContext c2 = new HintContext();
+		
+		c1.setHint(KEY, 1.0);
+		c2.setHint(KEY, 2.0);
+		
+		// KEY added
+		stack.addHintContext(c1, 0);
+		// KEY overridden
+		stack.addHintContext(c2, 1);
+		
+		// underlying removed, do not do anything
+		stack.removeHintContext(c1);
+		
+		// add over prev value, override
+		stack.addHintContext(c1, 2);
+		
+		// should not do anything, is overridden
+		c2.setHint(KEY, 3.0);
+		
+		// changed. overrides c2
+		c1.setHint(KEY, 4.0);
+		
+		// removed. c2's value 3 becomes effective
+		c1.removeHint(KEY);
+	}
+
+}