java 使用 Mockito，如何存根返回类型为 void 的方法，该方法在传递某个参数时会引发异常？
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/15682631/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
With Mockito, how to stub a method with return type void which throws an exception when a certain argument is passed?
提问by rmoestl
Here is the principal Mockitodocumentation for stubbing void methods with exceptions. However, the example in the Mockito doc stubs a parameterlessmethod. What if the method has parametersand the method throws an Exceptionif the a parameter does not fulfills the contract?
这是用于存根 void 方法的主要Mockito文档和异常。但是，Mockito 文档中的示例存根了一个无参数方法。如果方法有参数，如果 a 参数不满足约定，方法会抛出异常怎么办？
So for the following class...
所以对于接下来的课程......
public class UserAccountManager {
/**
* @throws Exception if user with provided username already exists
*/
public void createAccount(User user) throws Exception {
// db access code ...
}
}
... how can UserAccountManager.createAccount be mockedwith Mockitoso that it throws an Exceptionif a certain User object is passedas an argument to the method?
...如何UserAccountManager.createAccount被模拟用的Mockito使得其抛出异常，如果一个特定的用户对象被传递作为参数的方法？
回答by rmoestl
The Mockito docalready shows an example of how to stub a parameterlessvoid method with exceptions.
所述的Mockito文档已经示出了如何存根的示例性参数的例外空隙方法。
However, for stubbing a void method with parameters and exceptions, do this:
但是，要使用参数和异常存根 void 方法，请执行以下操作：
Since the return type of createAccount is void, you have to use doThrow:
由于createAccount的返回类型是 void，您必须使用doThrow：
User existingUser = ... // Construct a user which is supposed to exist
UserAccountManager accountMng = mock(UserAccountManager.class);
doThrow(new Exception()).when(accountMng).createAccount(eq(existingUser));
Note the usage of the eqMatcher. If the argument's type (in this case User) does not implement equalson its own you can also try to use the refEqMatcher.
注意eqMatcher的用法。如果参数的类型（在本例中为 User）本身没有实现equals，您也可以尝试使用refEqMatcher。
