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diff --git a/bundles/org.simantics.databoard/testcases/org/simantics/databoard/tests/TestValidator.java b/bundles/org.simantics.databoard/testcases/org/simantics/databoard/tests/TestValidator.java
new file mode 100644
index 000000000..f2e4ec30e
--- /dev/null
+++ b/bundles/org.simantics.databoard/testcases/org/simantics/databoard/tests/TestValidator.java
@@ -0,0 +1,154 @@
+/*******************************************************************************
+ *  Copyright (c) 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.databoard.tests;
+
+import junit.framework.TestCase;
+
+import org.simantics.databoard.Bindings;
+import org.simantics.databoard.annotations.Length;
+import org.simantics.databoard.annotations.Optional;
+import org.simantics.databoard.annotations.Pattern;
+import org.simantics.databoard.annotations.Range;
+import org.simantics.databoard.binding.Binding;
+import org.simantics.databoard.binding.error.BindingConstructionException;
+import org.simantics.databoard.binding.error.BindingException;
+
+public class TestValidator extends TestCase {
+
+	public enum Test { Key1, Key2 }
+	
+	public static class Luokka {
+		public @Range("[0..100]") Integer percent = 0;
+		public @Optional Integer optionalValue;
+		public Boolean booleanValue = true;
+		public @Length("7") @Range("[1..39]") int[] lottoNumbers = new int[] {1,2,3,4,5,6,7};
+		public @Length("10") @Pattern("0x\\d{8}") String hexNumber = "0x11223344"; 
+	}
+	
+	public static Binding b = Bindings.getBindingUnchecked(Luokka.class);
+	public Luokka l;
+	
+	public void setUp() throws Exception {
+		l = new Luokka();
+	}
+	
+	public void testNumberType() throws Exception {
+		
+		l.percent = 100; 
+		b.assertInstaceIsValid( l );
+		
+		l.percent = 0;
+		b.assertInstaceIsValid( l );
+		
+		try {
+			l.percent = -1;
+			b.assertInstaceIsValid( -1 );
+			fail();
+		} catch ( BindingException e ) {}
+		
+		try {
+			l.percent = 101;
+			b.assertInstaceIsValid( 101 );
+			fail();
+		} catch ( BindingException e ) {}
+
+		try {
+			b.assertInstaceIsValid( new Integer(5) );
+			fail();
+		} catch ( BindingException e ) {}		
+		
+	}
+	
+	public void testOptionalType() throws BindingException {
+		l.optionalValue = 5;
+		b.assertInstaceIsValid( l );
+		
+		try {
+			l.percent = null;
+			b.assertInstaceIsValid( l );
+			fail();
+		} catch ( BindingException e ) {}				
+	}
+	
+	public void testBooleanType() throws BindingException {
+		b.assertInstaceIsValid( l );
+		
+		try {
+			b.assertInstaceIsValid( new Integer(5) );
+			fail();
+		} catch ( BindingException e ) {}				
+		
+	}
+	
+	public void testStringType() throws BindingException {
+		b.assertInstaceIsValid( l );
+		
+		try {
+			// not according to pattern
+			l.hexNumber = "Hello World";
+			b.assertInstaceIsValid( l );
+			fail();
+		} catch ( BindingException e ) {}
+		
+		try {
+			// Too short
+			l.hexNumber = "0x100";
+			b.assertInstaceIsValid( l );
+			fail();
+		} catch ( BindingException e ) {}				
+		
+	}
+	
+	public void testRecordType() throws BindingException {
+		b.assertInstaceIsValid( l );
+		// Already thoroughly tested by all other tests
+	}
+	
+	public void testUnionType() throws BindingException, BindingConstructionException {
+		Binding eb = Bindings.getBinding( Test.class );
+		eb.assertInstaceIsValid(Test.Key1);
+		eb.assertInstaceIsValid(Test.Key2);
+		try {
+			b.assertInstaceIsValid( new Integer(5) );
+			fail();
+		} catch ( BindingException e ) {}				
+		
+	}
+	
+	public void testArrayType() throws BindingException {
+		b.assertInstaceIsValid( l );
+				
+		try {
+			// Too many numbers
+			l.lottoNumbers = new int[] {1,2,3,4,5,6,7, 10, 10, 10, 10};
+			b.assertInstaceIsValid( l );
+			fail();
+		} catch ( BindingException e ) {}				
+
+		try {
+			// Not enough numbers
+			l.lottoNumbers = new int[] {1, 2, 3};
+			b.assertInstaceIsValid( l );
+			fail();
+		} catch ( BindingException e ) {}				
+				
+		try {
+			// not with in 1..39
+			l.lottoNumbers = new int[] {100,-2,3,4,5,6,7};
+			b.assertInstaceIsValid( l );
+			fail();
+		} catch ( BindingException e ) {}
+
+	}
+	
+}
+