java - Mockito - 模拟库调用

Question

我有以下结构

public class classAImpl implements classA {

   public ClassC getTarget(Classc cObj) { 
   // library call
    RegistryLib.init();
    // some more code to construct cObj with more info
    return cObj
  }
}

// Registry Library Class
Class RegistryLibClass{
   public void init() {
   ClassD.builder.build();   
}
}

我的测试类正在尝试测试调用上面编写的 getTarget() 方法的方法。我想完全避免执行 getTarget() 方法，即使在模拟它之后我也无法执行该方法。到目前为止，我已经尝试过以下方法:

Class Testclass {
   @Before
   public void setUp() {
      Testclass mock = PowerMockito.mock(Testclass.class);
      PowerMockito.when(mock.getTarget(cObj)).thenReturn(cObj);    
  }

 private ClassC getTarget(cObj) {
        return cObj;
    }
}

感谢任何帮助!

Answer 1

假设您想测试 B 类 中从 A 类 调用 getTarget 的方法，您可以这样做，

B b = new B();
A a = Mockito.mock(A.class);
C c = new C();
Mockito.when(a.getTarget(Mockito.any(C.class)).thenReturn(c);
boolean isPresent = b.someMethodToTest();
assertEquals("someMethodToTest was supposed to return true", true/*expected*/, isPresent);

编辑#1您需要使用 Powermockito 来模拟静态方法，以不返回任何内容，如上所述 here

@PrepareForTest(RegistryLibClass.class) //at the top of the class

//inside your test
PowerMockito.mockStatic(RegistryLibClass.class); 
Mockito.when(RegistryLibClass.init()).doNothing();