spring详解：使用Spring-Test对Spring框架进行单元测试

若使用junit的liberary可以完成对程序的测试。 

而进行spring开发时，spring提供了相关的测试模块，很方便进行配置文件加载，然后进行测试。

使用方法：

第一步：

引入测试包，在下载的spring的包的lib下找到：

把jar加到项目然后build path

第二步：编写测试类

@RunWith(value=SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations = { "classpath:applicationContext.xml" })
public class TestSpring{
	
	@Autowired
	private IUserService iUserService;
	
	@Test
	public void test(){
		System.out.println("test");
		iUserService.save();	
	}	

}

说明：

进行测试：

执行test()方法：

执行成功

一个问题

那么若使用的junit是IDE提供的liberary，可能会出现Junit版本太低的问题，报如下错误：

java.lang.ExceptionInInitializerError
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
	at java.lang.reflect.Constructor.newInstance(Unknown Source)
	at org.junit.internal.builders.AnnotatedBuilder.buildRunner(AnnotatedBuilder.java:31)
	at org.junit.internal.builders.AnnotatedBuilder.runnerForClass(AnnotatedBuilder.java:24)
	at org.junit.runners.model.RunnerBuilder.safeRunnerForClass(RunnerBuilder.java:57)
	at org.junit.internal.builders.AllDefaultPossibilitiesBuilder.runnerForClass(AllDefaultPossibilitiesBuilder.java:29)
	at org.junit.runners.model.RunnerBuilder.safeRunnerForClass(RunnerBuilder.java:57)
	at org.junit.internal.requests.ClassRequest.getRunner(ClassRequest.java:24)
	at org.junit.internal.requests.FilterRequest.getRunner(FilterRequest.java:33)
	at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.(JUnit4TestReference.java:33)
	at org.eclipse.jdt.internal.junit4.runner.JUnit4TestMethodReference.(JUnit4TestMethodReference.java:25)
	at org.eclipse.jdt.internal.junit4.runner.JUnit4TestLoader.createTest(JUnit4TestLoader.java:54)
	at org.eclipse.jdt.internal.junit4.runner.JUnit4TestLoader.loadTests(JUnit4TestLoader.java:38)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:452)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
Caused by: java.lang.IllegalStateException: Failed to find class [org.junit.runners.model.MultipleFailureException]: SpringJUnit4ClassRunner requires JUnit 4.9 or higher.
	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.(SpringJUnit4ClassRunner.java:102)

那么把项目的Junit给remove掉，然后下载Junit4.9或以上版本的jar放到项目的lib下即可解决

junit4.9下载地址：下载Junit4.9