j在不同情况下使用相同的异常 [英] jUnit same exception in different cases

问题描述

我正在为一个解析String的构造函数编写一个jUnit测试，然后检查很多东西。当有错误的数据时，对于每一件事，都会抛出一些带有不同消息的IllegalArgumentException。
所以我想为它编写测试，但是我如何识别抛出的错误？
这是我该怎么做的：

I'm writing a jUnit test for a constructor that parses a String and then check numerous things. When there's wrong data, for every thing, some IllegalArgumentException with different message is thrown. So I would like to write tests for it, but how can i recognize what error was thrown? This is how can I do it:

@Test(expected=IllegalArgumentException.class)
public void testRodneCisloRok(){
    new RodneCislo("891415",dopocitej("891415"));
}

这就是我想要的，但我不知道如果有可能以某种方式写它：

and this is how I would like to be, but I don't know if it is possible to write it somehow:

@Test(expected=IllegalArgumentException.class("error1"))
public void testRodneCisloRok(){
    new RodneCislo("891415",dopocitej("891415"));
}

推荐答案

你需要做的它是老式的方式：

You'll need to do it the old fashioned way:

@Test
public void testRodneCisloRok() {
    try {
       new RodneCislo("891415",dopocitej("891415"));
       fail("expected an exception");
    } catch (IllegalArgumentException ex) {
       assertEquals("error1", ex.getMessage());
    }
}

@Test（预期= ...）语法是一种方便的方便，但在很多情况下它太简单了。

The @Test(expected=...) syntax is a handy convenience, but it's too simple in many cases.

如果区分异常条件很重要，您可能需要考虑开发一个可以特定捕获的异常的类层次结构。在这种情况下， IllegalArgumentException 的子类可能是个好主意。它可以说是更好的设计，你的测试可以捕获特定的异常类型。

If it is important to distinguish between exception conditions, you might want to consider developing a class hierarchy of exceptions, that can be caught specifically. In this case, a subclass of IllegalArgumentException might be a good idea. It's arguably better design, and your test can catch that specific exception type.

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