/*
    * Copyright 2007 Kasper B. Graversen
    * 
    * 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.supercsv.util;
  
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertNotNull;
  import static org.junit.Assert.assertNull;
  
  import org.junit.Before;
  import org.junit.Test;
  
  /**
   * Tests the BeanInterfaceProxy class.
   * 
   * @author James Bassett
   */
  public class BeanInterfaceProxyTest {
  	
  	private TestInterface testInterface;
  	
  	/**
  	 * Creates the proxy for the test.
  	 */
  	@Before
  	public void setUp() {
  		testInterface = BeanInterfaceProxy.createProxy(TestInterface.class);
  	}
  	
  	/**
  	 * Tests the proxy.
  	 */
  	@Test
  	public void testProxy() {
  		// no state saved yet
  		assertNull(testInterface.getValue());
  		
  		// modify state
  		String value = "value";
  		testInterface.setValue(value);
  		
  		// check state was saved
  		assertEquals(value, testInterface.getValue());
  		
  		// modify state (to null)
  		testInterface.setValue(null);
  		
  		// check state was saved
  		assertNull(testInterface.getValue());
  	}
  	
  	/**
  	 * Tests the proxy with chained setters (the proxy allows for setters which return the modified object).
  	 */
  	@Test
  	public void testChainedSetters() {
  		// no state saved yet
  		assertNull(testInterface.getValue());
  		
  		// modify state
  		String value = "value";
  		String value2 = "value2";
  		testInterface.setValue(value).setValue2(value2);
  		
  		// check state was saved
  		assertEquals(value, testInterface.getValue());
  		assertEquals(value2, testInterface.getValue2());
  	}
  	
  	/**
  	 * Tests createProxy() with null.
  	 */
  	@Test(expected = NullPointerException.class)
  	public void testCreateProxyWithNull() {
  		BeanInterfaceProxy.createProxy(null);
  	}
  	
  	/**
  	 * Tests invocation of a method that isn't a standard getter/setter.
  	 */
  	@Test(expected = IllegalArgumentException.class)
  	public void testNotGetterOrSetter() {
  		testInterface.isValueSet();
  	}
  	
  	/**
  	 * Tests invocation of a getter with a parameter (not a real getter).
 	 */
 	@Test(expected = IllegalArgumentException.class)
 	public void testGetterWithParam() {
 		testInterface.getWithParam("param");
 	}
 	
 	/**
 	 * Tests invocation of a method beginning with 'set' that takes many parameters (not a real setter).
 	 */
 	@Test(expected = IllegalArgumentException.class)
 	public void testMultiParamSetter() {
 		testInterface.setManyValues("value1", "value2");
 	}
 	
 	/**
 	 * Tests invocation of a setter without any parameters (not a real setter).
 	 */
 	@Test(expected = IllegalArgumentException.class)
 	public void testSetterWithNoParams() {
 		testInterface.setNothing();
 	}
 	
 	/**
 	 * Tests invocation of the <tt>getClass</tt> method, inherited from <tt>Object</tt> (doesn't call the
 	 * <tt>InvocationHandler</tt>, but returns the proxy class!).
 	 */
 	@Test
 	public void testGetClass() {
 		assertNotNull(testInterface.getClass());
 		
 	}
 	
 	/**
 	 * An interface to use for testing.
 	 */
 	private interface TestInterface {
 		
 		public TestInterface setValue(String value); // proxy allows setters that returned the modified object
 		
 		public void setValue2(String value);
 		
 		public String getValue();
 		
 		public String getValue2();
 		
 		public String getWithParam(String value1); // getters with params not allowed
 		
 		public void setManyValues(String value1, String value2); // multi param setters not allowed
 		
 		public void setNothing(); // setters should have 1 param
 		
 		public boolean isValueSet(); // methods not starting with get/set are not allowed (yes, even boolean getters!)
 		
 	}
 	
 }