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diff --git a/bundles/org.simantics.databoard/testcases/org/simantics/databoard/tests/TestDirectoryWatch.java b/bundles/org.simantics.databoard/testcases/org/simantics/databoard/tests/TestDirectoryWatch.java
new file mode 100644
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+++ b/bundles/org.simantics.databoard/testcases/org/simantics/databoard/tests/TestDirectoryWatch.java
@@ -0,0 +1,110 @@
+/*******************************************************************************
+ * 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 java.io.File;
+import java.io.FileFilter;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Random;
+
+import junit.framework.TestCase;
+
+import org.simantics.databoard.accessor.impl.DirectoryWatch;
+import org.simantics.databoard.accessor.impl.DirectoryWatch.DirectoryEvent;
+import org.simantics.databoard.accessor.impl.DirectoryWatch.DirectoryListener;
+
+/**
+ * This test case tests Wathc Servlet.
+ * 
+ * It creates a random named directory under $TMP$
+ * There it 
+ *
+ * @author Toni Kalajainen <toni.kalajainen@vtt.fi>
+ */
+public class TestDirectoryWatch extends TestCase {
+
+	File tmpDir;
+	
+	public static File createTmpDir()
+	{
+		String tmp = System.getenv("tmp");
+		if (tmp==null) tmp = "c:/temp";
+		Random r = new Random();
+		String randomName = "tmp-"+(r.nextInt(10000)+10000);
+		File tmpDir = new File(tmp+"/"+randomName);
+		Boolean ok = tmpDir.mkdirs();
+		assertTrue( ok );
+		return tmpDir;
+	}
+	
+	public void setUp() throws Exception {
+		tmpDir = createTmpDir();
+	}
+	
+	@Override
+	protected void tearDown() throws Exception {
+		boolean ok = tmpDir.delete();
+		if (!ok) System.err.println(tmpDir+" was not removed.");
+	}	
+	
+	public void testAll() 
+	throws Exception {
+		
+		FileFilter filter = new FileFilter() {
+			public boolean accept(File pathname) {				
+				return pathname.getAbsolutePath().toLowerCase().endsWith(".dbb");
+			}};
+			
+		DirectoryWatch monitor = new DirectoryWatch(tmpDir, filter);
+		
+		final DirectoryEvent result = new DirectoryEvent();
+		
+		// Set listener that collects changes
+		monitor.addListener(new DirectoryListener() {
+			@Override
+			public void onWatchEvent(DirectoryEvent e) {
+				result.filesAdded.addAll(e.filesAdded);
+				result.filesRemoved.addAll(e.filesRemoved);
+			}});
+
+		// Create file names
+		List<File> files = new ArrayList<File>();
+		for (int i=1; i<10; i++) {
+			files.add( new File(tmpDir, "file-"+i+".dbb") );
+		}
+		
+		// Create files
+		for (File f : files)
+		{
+			f.createNewFile();
+		}		
+		Thread.sleep( DirectoryWatch.POLL_INTERVAL*2 );		
+		assertTrue( files.containsAll( result.filesAdded ) );
+		assertTrue( result.filesAdded.containsAll( files ) );
+		assertTrue( result.filesRemoved.isEmpty() );		
+		result.filesAdded.clear();
+		
+		// Delete files
+		for (File f : files)
+			f.delete();
+		Thread.sleep( DirectoryWatch.POLL_INTERVAL*2 );		
+		assertTrue( files.containsAll( result.filesRemoved ) );
+		assertTrue( result.filesRemoved.containsAll( files ) );
+		assertTrue( result.filesAdded.isEmpty() );		
+		result.filesRemoved.clear();
+		
+		monitor.close();		
+	}
+	
+}
+