Commons Beanutils example source code file (BeanComparatorTestCase.java)

This example Commons Beanutils source code file (BeanComparatorTestCase.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Commons Beanutils tags/keywords

alphabean, beancomparator, beancomparator, beancomparatortestcase, classcaseexception, classcastexception, comparator, comparator, exception, exception, result, testbean, testbean, wrong

The Commons Beanutils BeanComparatorTestCase.java source code

/*
 * 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.commons.beanutils;


import junit.framework.Test;
import junit.framework.TestCase;
import junit.framework.TestSuite;


/**
 * <p>
 *  Test Case for the BeanComparator class.
 *
 * @author <a href="mailto:epugh@upstate.com">Eric Pugh
 * @version $Revision: 745074 $
 */

public class BeanComparatorTestCase extends TestCase {

    // ---------------------------------------------------- Instance Variables

    /**
     * The test beans for each test.
     */
    protected TestBean bean = null;
    protected AlphaBean alphaBean1 = null;
    protected AlphaBean alphaBean2 = null;

    // The test BeanComparator
    protected BeanComparator beanComparator = null;





    // ---------------------------------------------------------- Constructors

    /**
     * Construct a new instance of this test case.
     *
     * @param name Name of the test case
     */
    public BeanComparatorTestCase(String name) {
        super(name);
    }


    // -------------------------------------------------- Overall Test Methods


    /**
     * Set up instance variables required by this test case.
     */
    public void setUp() {
        bean = new TestBean();
        alphaBean1 = new AlphaBean("alphaBean1");
        alphaBean2 = new AlphaBean("alphaBean2");


    }


    /**
     * Return the tests included in this test suite.
     */
    public static Test suite() {
        return (new TestSuite(BeanComparatorTestCase.class));
    }

    /**
     * Tear down instance variables required by this test case.
     */
    public void tearDown() {
        bean = null;
        alphaBean1 = null;
        alphaBean2 = null;
        beanComparator = null;
    }


    // ------------------------------------------------ Individual Test Methods


    /**
     *  tests comparing two beans via their name using the default Comparator
     */
    public void testSimpleCompare() {
        try {
          beanComparator = new BeanComparator("name");
          int result = beanComparator.compare(alphaBean1, alphaBean2);
          assertTrue("Comparator did not sort properly.  Result:" + result,result==-1);

        }
        catch (Exception e) {
            fail("Exception");
        }
    }

    /**
     *  tests comparing two beans via their name using the default Comparator, but the inverse
     */
    public void testSimpleCompareInverse() {
        try {
          beanComparator = new BeanComparator("name");
          int result = beanComparator.compare(alphaBean2, alphaBean1);
          assertTrue("Comparator did not sort properly.  Result:" + result,result==1);

        }
        catch (Exception e) {
            fail("Exception" + e);
        }
    }

    /**
     *  tests comparing two beans via their name using the default Comparator where they have the same value.
     */
    public void testCompareIdentical() {
        try {
          alphaBean1 = new AlphaBean("alphabean");
          alphaBean2 = new AlphaBean("alphabean");
          beanComparator = new BeanComparator("name");
          int result = beanComparator.compare(alphaBean1, alphaBean2);
          assertTrue("Comparator did not sort properly.  Result:" + result,result==0);

        }
        catch (Exception e) {
            fail("Exception");
        }
    }

    /**
     *  tests comparing one bean against itself.
     */
    public void testCompareBeanAgainstSelf() {
        try {
          beanComparator = new BeanComparator("name");
          int result = beanComparator.compare(alphaBean1, alphaBean1);
          assertTrue("Comparator did not sort properly.  Result:" + result,result==0);

        }
        catch (Exception e) {
            fail("Exception");
        }
    }

    /**
     *  tests comparing two beans via their name using the default Comparator, but with one of the beans
     *  being null.
     */
    public void testCompareWithNulls() {
        try {
          beanComparator = new BeanComparator("name");
          beanComparator.compare(alphaBean2, null);

          // DEP not sure if this is the best way to test an exception?
          fail("Should not be able to compare a null value.");

        }
        catch (Exception e) {

        }
    }

    /**
     *  tests comparing two beans who don't have a property
     */
    public void testCompareOnMissingProperty() {
        try {
          beanComparator = new BeanComparator("bogusName");
          beanComparator.compare(alphaBean2, alphaBean1);
          fail("should not be able to compare");


        }
        catch (Exception e) {
          assertTrue("Wrong exception was thrown: " + e, e.toString().indexOf("Unknown property") > -1);
        }
    }

    /**
     *  tests comparing two beans on a boolean property, which is not possible.
     */
    public void testCompareOnBooleanProperty() {
        try {
          TestBean testBeanA = new TestBean();
          TestBean testBeanB = new TestBean();

          testBeanA.setBooleanProperty(true);
          testBeanB.setBooleanProperty(false);

          beanComparator = new BeanComparator("booleanProperty");
          beanComparator.compare(testBeanA, testBeanB);

          // **** java.lang.Boolean implements Comparable from JDK 1.5 onwards
          //      so this test no longer fails
          // fail("BeanComparator should throw an exception when comparing two booleans.");

        }
        catch (ClassCastException cce){
          // Expected result
        }
        catch (Exception e) {
            fail("Exception" + e);
        }
    }

    /**
     *  tests comparing two beans on a boolean property, then changing the property and testing
     */
    public void testSetProperty() {
        try {
          TestBean testBeanA = new TestBean();
          TestBean testBeanB = new TestBean();

          testBeanA.setDoubleProperty(5.5);
          testBeanB.setDoubleProperty(1.0);

          beanComparator = new BeanComparator("doubleProperty");
          int result = beanComparator.compare(testBeanA, testBeanB);

          assertTrue("Comparator did not sort properly.  Result:" + result,result==1);

          testBeanA.setStringProperty("string 1");
          testBeanB.setStringProperty("string 2");

          beanComparator.setProperty("stringProperty");

          result = beanComparator.compare(testBeanA, testBeanB);

          assertTrue("Comparator did not sort properly.  Result:" + result,result==-1);

        }
        catch (ClassCastException cce){
          fail("ClassCaseException " + cce.toString());
        }
        catch (Exception e) {
          fail("Exception" + e);
        }
    }
}