java JUnit 自定义注解
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JUnit custom annotation
提问by Szymon Lipiński
I wanted to create a custom JUnit annotation, something similar to expected tag in @Test, but I want to also check the annotation message.
我想创建一个自定义 JUnit 注释，类似于 @Test 中的预期标记，但我还想检查注释消息。
Any hints how to do that, or maybe there is something ready?
任何提示如何做到这一点，或者可能已经准备好了？
采纳答案by bhavanki
JUnit 4.9 tightened up the library's use of "rules" for tests, which I think might work as well as a custom annotation. Take a look at TestRuleas a starting point. You can implement a rule based on that interface, and then use either the @ClassRule or (method-level) @Rule annotations to put them into play in your tests.
JUnit 4.9 加强了库对测试“规则”的使用，我认为这可能与自定义注释一样有效。以TestRule为起点。您可以基于该接口实现规则，然后使用 @ClassRule 或（方法级）@Rule 注释将它们用于您的测试。
A good concrete example is ExpectedException, which lets you specify exceptions like the expected parameter for @Test does (and then some).
一个很好的具体示例是ExpectedException，它允许您指定像 @Test 的预期参数那样的异常（然后是一些）。
回答by Anders
To make JUnit4 pickup your custom annotations, you need to write your own custom Runner implementation, and then supply that to the RunWith-annotation on the Test class.
要让 JUnit4 接收您的自定义注释，您需要编写自己的自定义 Runner 实现，然后将其提供给 Test 类上的 RunWith-annotation。
You can start out by having a look at the BlockJUnit4ClassRunner, which is the default implementation runner for JUnit 4 (if memory serves me well).
您可以从查看 BlockJUnit4ClassRunner 开始，它是 JUnit 4 的默认实现运行程序（如果我没记错的话）。
Assuming you would want to pick up a custom annotation named @MyTest with a custom runner MyRunner, your test class would look something like:
假设您想要使用自定义运行程序 MyRunner 获取名为 @MyTest 的自定义注释，您的测试类将如下所示：
@RunWith(MyRunner.class)
class Tests {
...
@MyTest
public void assumeBehaviour() {
...
}
}
The answer by "Reid Mac" does a fairly good job at decribing how a custom annotation is implemented.
“Reid Mac”的回答在描述如何实现自定义注释方面做得相当好。
回答by dev_il
You can create custom TestRuleas mentioned in first answer or you can use/extend TestWatcherthat already have method for processing start/finish of test.
There is a method apply(Statement base, Description description)where description is actually a wrapper around your test method. Descriptionhas a great method getAnnotation(annotationClass)which will let you do what you want by specifying a custom annotation you want to process
您可以创建第一个答案中提到的自定义TestRule，或者您可以使用/扩展已经具有处理测试开始/结束方法的TestWatcher。有一种方法apply(Statement base, Description description)，其中描述实际上是测试方法的包装器。Description有一个很棒的方法getAnnotation(annotationClass)，它可以让您通过指定要处理的自定义注释来做您想做的事
