/*
 * Copyright 2004-2007 the original author or authors.
 *
 * Licensed 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.springframework.webflow.util;

import junit.framework.TestCase;

/**
 * Unit tests for {@link DispatchMethodInvoker}.
 * 
 * @author Ben Hale
 */
public class DispatchMethodInvokerTests extends TestCase {

	private class MockClass {
		private boolean methodCalled = false;

		public boolean getMethodCalled() {
			return methodCalled;
		}

		public void argumentMethod(Object o) {
			methodCalled = true;
		}

		public void noArgumentMethod() {
			methodCalled = true;
		}

		public void exceptionMethod(Object o) throws Exception {
			throw new Exception("expected exception");
		}
	}

	private MockClass mockClass;

	protected void setUp() {
		mockClass = new MockClass();
	}

	public void testInvokeWithExplicitParameters() throws Exception {
		DispatchMethodInvoker invoker = new DispatchMethodInvoker(mockClass, new Class[] { Object.class });
		invoker.invoke("argumentMethod", new Object[] { "testValue" });
		assertTrue("Method should have been called successfully", mockClass.getMethodCalled());
	}

	public void testInvokeWithAssignableParameters() throws Exception {
		DispatchMethodInvoker invoker = new DispatchMethodInvoker(mockClass, new Class[] { String.class });
		invoker.invoke("argumentMethod", new Object[] { "testValue" });
		assertTrue("Method should have been called successfully", mockClass.getMethodCalled());
	}

	public void testInvokeWithNoParameters() throws Exception {
		DispatchMethodInvoker invoker = new DispatchMethodInvoker(mockClass, new Class[0]);
		invoker.invoke("noArgumentMethod", new Object[0]);
		assertTrue("Method should have been called successfully", mockClass.getMethodCalled());
	}

	public void testInvokeWithException() {
		DispatchMethodInvoker invoker = new DispatchMethodInvoker(mockClass, new Class[] { Object.class });
		try {
			invoker.invoke("exceptionMethod", new Object[] { "testValue" });
			fail("Should have thrown an exception");
		} catch (Exception e) {
		}
	}

}
