--- /dev/null
+/*
+ * Copyright (c) 2013 Cisco Systems, Inc. and others. 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
+ */
+package org.opendaylight.yangtools.yang.parser.impl;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.assertNull;
+import static org.junit.Assert.assertTrue;
+
+import java.io.File;
+import java.math.BigInteger;
+import java.net.URI;
+import java.util.Arrays;
+import java.util.List;
+import java.util.Set;
+import org.junit.Before;
+import org.junit.Test;
+import org.opendaylight.yangtools.yang.common.QName;
+import org.opendaylight.yangtools.yang.model.api.IdentitySchemaNode;
+import org.opendaylight.yangtools.yang.model.api.LeafSchemaNode;
+import org.opendaylight.yangtools.yang.model.api.Module;
+import org.opendaylight.yangtools.yang.model.api.Status;
+import org.opendaylight.yangtools.yang.model.api.TypeDefinition;
+import org.opendaylight.yangtools.yang.model.api.type.BitsTypeDefinition.Bit;
+import org.opendaylight.yangtools.yang.model.api.type.EnumTypeDefinition.EnumPair;
+import org.opendaylight.yangtools.yang.model.api.type.LengthConstraint;
+import org.opendaylight.yangtools.yang.model.api.type.PatternConstraint;
+import org.opendaylight.yangtools.yang.model.api.type.StringTypeDefinition;
+import org.opendaylight.yangtools.yang.model.parser.api.YangContextParser;
+import org.opendaylight.yangtools.yang.model.util.BitsType;
+import org.opendaylight.yangtools.yang.model.util.EnumerationType;
+import org.opendaylight.yangtools.yang.model.util.ExtendedType;
+import org.opendaylight.yangtools.yang.model.util.IdentityrefType;
+import org.opendaylight.yangtools.yang.model.util.InstanceIdentifierType;
+import org.opendaylight.yangtools.yang.model.util.UnionType;
+
+public class Bug2291Test {
+
+ @Test
+ public void testRevisionWithExt() throws Exception {
+ File extdef = new File(getClass().getResource("/bugs/bug2291/bug2291-ext.yang").toURI());
+ File bug = new File(getClass().getResource("/bugs/bug2291/bug2291.yang").toURI());
+ File inet = new File(getClass().getResource("/ietf/ietf-inet-types@2010-09-24.yang").toURI());
+ YangContextParser parser = new YangParserImpl();
+ parser.parseFiles(Arrays.asList(extdef, bug, inet));
+ }
+
+}