bug_0">bug再现

在使用mock测试时，像这样注入一个服务类

@InjectMocks
private IUserRegisterService userRegisterService;

然后再进行测试就会报这个错

Cannot instantiate @InjectMocks field named 'userRegisterService'! Cause: the type 'IUserRegisterService' is an interface.
You haven't provided the instance at field declaration so I tried to construct the instance.

解决

其实报错里已经说了，这个I开头的是个接口，我们应该注入一个具体实现类

@InjectMocks
private UserRegisterServiceImpl userRegisterService;  // 需要测试的 Service 实现

像这样写一个Impl就ok了。