我们可能会碰到需要被测试的代码里面包含了system.exit()语句，我们只想退出当前测试用例，并不想退出整个测试(后面还有很多测试没跑).
下面是解决办法，直接贴代码
protected static class ExitException extends SecurityException {
public final int status;
public ExitException(int status) {
super("There is no escape!");
this.status = status;
}
}
private static class NoExitSecurityManager extends SecurityManager {
public void checkPermission(Permission perm) {
// allow anything.
}
public void checkPermission(Permission perm, Object context) {
// allow anything.
}
@Override
public void checkExit(int status) {
super.checkExit(status);
throw new ExitException(status);
}
}
@Override
protected void setUp() throws IOException {
//通过该语句指定程序退出时的安全检查程序，我们可在里面动手脚
System.setSecurityManager(new NoExitSecurityManager());
overwriteLogFile("");
}
@Override
protected void tearDown() throws IOException {
System.setSecurityManager(null);
}
/**
* Accuracy test for <code>main(String[])</code>. Tests situation when the
* usage message should be given.
*
* @throws IOException
* to JUnit
*/
public void test_main_Accuracy() throws IOException {
String[] args = { "-help" };
try {
GLUIJobsDaemon.main(args);
//程序退出时会执行NoExitSecurityManager里的方法(System.setSecurityManager(new
// NoExitSecurityManager());
//我们在checkExit方法时抛出异常ExitException 而不真正退出，随后异常被捕捉，见下面
} catch (ExitException e) {
assertEquals("Exit status should be right", 0, e.status);
}
}