應用設計模式編寫易于單元測試的代碼[7]

       應用設計模式編寫易于單元測試的代碼[7]   單元測試工具

　　// LogicToBeTested.java

　　packagecom.instancefactory.demo;

　　public class LogicToBeTested {

　　public static final String PROPERTY_KEY= "BaseObjects";

　　public void doSomething() {

　　// load configuration file and read the implementation class name of BaseObjects

　　// read it from properties to simplify the demo

　　// actually, the property file reader can be implemented by InstanceFactory

　　String impl = System.getProperty(PROPERTY_KEY);

　　InstanceFactory factory = new InstanceFactory(impl);

　　BaseObjects b = (BaseObjects)factory.getInstance();

　　b.doSomething();

　　}

　　}

　　// LogicTest.java

　　packagecom.instancefactory.demo;

　　importjunit.framework.TestCase;

　　public class LogicTest extends TestCase {

　　LogicToBeTested c;

　　protected void setUp() {

　　// set the property file of class map to a file for MockObjects, omitted

　　// use System.setProperty to simplify the demo

　　System.setProperty(LogicToBeTested.PROPERTY_KEY,

　　"com.instancefactory.demo.MockOuterObjects");軟件測試　

    　c = new LogicToBeTested();

　　}

　　public void testDoSomething() {

　　c.doSomething();

　　}

　　}

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