在JUnit测试中处理System.exit（0）

我该如何处理是安装一个安全管理器，该安全管理器在调用System.exit时会引发异常。然后是捕获异常且不会使测试失败的代码。

public class NoExitSecurityManager    extends java.rmi.RMISecurityManager{    private final SecurityManager parent;    public NoExitSecurityManager(final SecurityManager manager)    {        parent = manager;    }    public void checkExit(int status)    {        throw new AttemptToExitException(status);    }    public void checkPermission(Permission perm)    {    }}

然后在代码中，如下所示：

catch(final Throwable ex){    final Throwable cause;    if(ex.getCause() == null)    {        cause = ex;    }    else    {        cause = ex.getCause();    }    if(cause instanceof AttemptToExitException)    {        status = ((AttemptToExitException)cause).getStatus();    }    else    {        throw cause;    }}assertEquals("System.exit must be called with the value of " + expectedStatus, expectedStatus, status);