我如何用断言JUnit测试批注我的异常信息？ [英] How do I assert my exception message with JUnit Test annotation?

问题描述

我已经写了以 @Test 标注了一些JUnit测试。如果我的测试方法抛出检查异常，如果我想沿着断言消息，异常，有没有办法用JUnit这样做 @Test 标注？据我所知，JUnit的4.7不提供此功能，但没有任何未来的版本提供呢？我知道在.net中，您可以断言的消息和异常类。寻找在Java世界中类似的功能。

这是我想要的：

  @Test（预期= RuntimeException.class，消息=雇员ID为空）
公共无效shouldThrowRuntimeExceptionWhenEmployeeIDisNull（）{}
 

解决方案

您可以使用 @rule 批注与<一个href=\"http://junit.org/javadoc/latest/org/junit/rules/ExpectedException.html\"><$c$c>ExpectedException,像这样的：

  @rule
公众的ExpectedException expectedEx = ExpectedException.none（）;@测试
公共无效shouldThrowRuntimeExceptionWhenEmployeeIDisNull（）抛出异常{
    expectedEx.expect（RuntimeException.class）;
    expectedEx.expectMessage（员工ID为空）;
    //做一些事情，应该抛出异常...
}
 

请注意，在的ExpectedException 文档的例子是（目前）错误 - 没有公共的构造，所以你必须使用 ExpectedException.none（ ）。

I have written a few JUnit tests with @Test annotation. If my test method throws a checked exception and if I want to assert the message along with the exception, is there a way to do so with JUnit @Test annotation? AFAIK, JUnit 4.7 doesn't provide this feature but does any future versions provide it? I know in .NET you can assert the message and the exception class. Looking for similar feature in the Java world.

This is what I want:

@Test (expected = RuntimeException.class, message = "Employee ID is null")
public void shouldThrowRuntimeExceptionWhenEmployeeIDisNull() {}

解决方案

You could use the @Rule annotation with ExpectedException, like this:

@Rule
public ExpectedException expectedEx = ExpectedException.none();

@Test
public void shouldThrowRuntimeExceptionWhenEmployeeIDisNull() throws Exception {
    expectedEx.expect(RuntimeException.class);
    expectedEx.expectMessage("Employee ID is null");
    // do something that should throw the exception...
}

Note that the example in the ExpectedException docs is (currently) wrong - there's no public constructor, so you have to use ExpectedException.none().

这篇关于我如何用断言JUnit测试批注我的异常信息？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！