当测试碰到system.exit()

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);

        }

    }