Add a test case for the new ValueExpression.getValueReference() method.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@898967 13f79535-47bb-0310-9956-ffa450edef68

diff --git a/test/org/apache/el/TestValueExpressionImpl.java b/test/org/apache/el/TestValueExpressionImpl.java
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+++ b/test/org/apache/el/TestValueExpressionImpl.java
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+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.el;
+
+import javax.el.ELContext;
+import javax.el.ExpressionFactory;
+import javax.el.ValueExpression;
+import javax.el.ValueReference;
+
+import org.apache.jasper.el.ELContextImpl;
+
+import junit.framework.TestCase;
+
+public class TestValueExpressionImpl extends TestCase {
+
+    public void testGetValueReference() {
+        ExpressionFactory factory = ExpressionFactory.newInstance();
+        ELContext context = new ELContextImpl();
+        
+        TesterBeanB beanB = new TesterBeanB();
+        beanB.setName("Tomcat");
+        ValueExpression var = factory.createValueExpression(beanB, TesterBeanB.class);
+        context.getVariableMapper().setVariable("beanB", var);
+
+        ValueExpression ve =
+            factory.createValueExpression(context, "${beanB.name}", String.class); 
+
+        // First check the basics work
+        String result = (String) ve.getValue(context);
+        assertEquals("Tomcat", result);
+        
+        // Now check the value reference
+        ValueReference vr = ve.getValueReference(context);
+        assertNotNull(vr);
+        
+        assertEquals(beanB, vr.getBase());
+        assertEquals("name", vr.getProperty());
+    }
+
+}