JUnit测试异常 [英] JUnit Testing Exceptions

问题描述

我是java的新手。

I'm really new to java.

我正在构造函数上运行一些JUnit测试。构造函数是这样的，如果给它的一个参数一个null或一个空字符串，它应该抛出一个异常。

I'm running some JUnit tests on a constructor. The constructor is such that if it is given a null or an empty string for one of its parameters, it's supposed to throw an exception.

当我在JUnit中使用null或空字符串参数测试此构造函数时，我得到一个红色条，即使我几乎100％确定构造函数方法当这些参数传递给它时确实会引发异常。

When I test this constructor in JUnit with a null or an empty string parameter, I get a red bar, even though I'm almost 100% sure that the constructor method does indeed throw an exception when such parameters are passed in to it.

如果方法按照预期的方式抛出异常，JUnit中是否应该有绿色条？或者，当异常投掷以预期的方式运行时，你应该得到一个红色条吗？

Shouldn't there be a green bar in JUnit if the method throws an exception the way it is supposed to? Or is it that when you are supposed to get a red bar when the exception throwing works the way it is supposed to?

推荐答案

@Test(expected = Exception.class)  

告诉Junit异常是预期的结果，因此在抛出异常时将传递测试（标记为绿色）。

Tells Junit that exception is the expected result so test will be passed (marked as green) when exception is thrown.

@Test

如果抛出异常，Junit会认为测试失败。

这个链接可能有所帮助。

Junit will consider test as failed if exception is thrown.
This link might help.

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