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diff --git a/tests/org.simantics.db.tests/src/org/simantics/db/tests/api/write/claimValue/DataBlobTest.java b/tests/org.simantics.db.tests/src/org/simantics/db/tests/api/write/claimValue/DataBlobTest.java
new file mode 100644
index 000000000..d80ddc175
--- /dev/null
+++ b/tests/org.simantics.db.tests/src/org/simantics/db/tests/api/write/claimValue/DataBlobTest.java
@@ -0,0 +1,98 @@
+/*******************************************************************************
+ * 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.db.tests.api.write.claimValue;
+
+import java.util.Collection;
+import java.util.UUID;
+
+import org.junit.Test;
+import org.simantics.db.ReadGraph;
+import org.simantics.db.Resource;
+import org.simantics.db.WriteGraph;
+import org.simantics.db.testing.base.ExistingDatabaseTest;
+import org.simantics.db.testing.common.WriteQuery;
+import org.simantics.layer0.Layer0;
+
+/**
+ * Creates large data array and stores it into the database.
+ * 
+ * @author Marko Luukkainen <marko.luukkainen@vtt.fi>
+ *
+ */
+public class DataBlobTest extends ExistingDatabaseTest {
+	
+	private static int ARRAY_SIZE = 1*1024*1024; // 60*1024*1024;
+	
+	@Test
+	public void testDataBlob() throws Exception{
+		final Resource rootLib = getSession().getRootLibrary();
+        final String random = UUID.randomUUID().toString();
+        final String newInstanceName = "New Instance" + random;
+        if (DEBUG)
+            System.out.println("Test start");
+			getSession().syncRequest(new WriteQuery(this) {
+				@Override
+				public void run(WriteGraph g) throws Throwable {
+					Layer0 b = Layer0.getInstance(g);
+					byte data[] = new byte[ARRAY_SIZE];
+					for (int i = 0; i < data.length; i++) {
+						data[i] = (byte)(i % 2);
+					}
+					Resource instance = g.newResource();
+					g.claim(instance, b.InstanceOf, null, b.Type);
+					g.claimLiteral(instance, b.HasName, newInstanceName);
+					g.claim(rootLib, b.ConsistsOf, instance);
+				
+					Resource prop = g.newResource();
+			        g.claim(prop, b.InstanceOf, b.ByteArray);
+			        g.claimValue(prop, data);
+			        
+			        // Link it to the thing
+			        g.claim(instance, b.HasProperty, prop);
+				}
+			});
+		
+		
+		checkException();
+
+        if (DEBUG)
+            System.out.println("Reading stage");
+		getSession().syncRequest(new TestReadRequest() {
+			@Override
+			public void run(ReadGraph g) throws Throwable {
+				Layer0 b = Layer0.getInstance(g);
+				Collection<Resource> resources = g.getObjects(rootLib, b.ConsistsOf);
+				for (Resource r : resources) {
+                    String value = g.getPossibleRelatedValue(r, b.HasName);
+                    if (null != value && value.equals(newInstanceName)) {
+                    	for (Resource p : g.getObjects(r, b.HasProperty))
+                    		if (g.isInstanceOf(p, b.ByteArray)) {
+		                    	byte[] data = g.getValue(p);
+		                    	if (data.length != ARRAY_SIZE)
+		                    		fail("Data blob lenght does not match.");
+		    					for (int i = 0; i < data.length; i++) {
+		    						if (data[i] != (byte)(i % 2))
+		    							fail("Data blob content does not match.");
+		    					}
+		    					return;
+                    		}
+                    }
+				}
+        		fail("Data blob not found.");
+			}
+		});
+        if (DEBUG)
+            System.out.println("test done");
+		checkException();
+	}
+
+}