Question

我有这样的场景，我需要测试一个方法，该方法使用带有静态方法调用的流畅api。我能够模拟静态调用，但我不知道如何模拟整个流畅的方法调用并返回相应的输出。

情景：

测试类：

 public class CustomerManagementService {
   /**
    * This method is used to verify the fluent api
    * @return
    */
     public String fluentApiVerificationWithStatic(){

        Customer customer=PaltformRuntime.getInstance().getElementRegistry().getElement();

        return customer.getName();
    }
}

PaltformRuntime类：

 public class PaltformRuntime {

    public static PaltformRuntime paltformRuntime = null;

    public static PaltformRuntime getInstance(){

        if(null == paltformRuntime) {
            paltformRuntime = new PaltformRuntime();
        }
        return paltformRuntime;
    }

     public PaltformRuntime getElementRegistry(){

         return paltformRuntime;
    }

    public Customer getElement(){       

        Customer c=new Customer();
         return c;
     }
 }

测试用例：

 @Test
 public void fluentVerificationwithStatic() throws Exception {  

    PaltformRuntime instance = PaltformRuntime.getInstance();       
    PowerMockito.mockStatic(PaltformRuntime.class);

    PowerMockito.when(PaltformRuntime.getInstance()).thenReturn(instance);


    CustomerManagementService customerManagementService=new CustomerManagementService();

    String result = customerManagementService.fluentApiVerificationWithStatic();

    //assertEquals(customer.getName(), result);

}

正如你可以看到的代码，我可以模拟 PaltformRuntime.getInstance（）但是如果我试图模拟 PaltformRuntime.getInstance（）。getElementRegistry（）。getElement（）< / strong>并返回customer对象我在getElementRegistry（）调用中得到一个空指针异常。我能够在没有任何静态方法的情况下模拟流畅的api。但是在这个场景中我被卡住了。我不知道失踪了什么？请建议如何使用静态方法模拟流畅的api。

Answer 1

对PaltformRuntime实例

使用深层存根

@Test
public void fluentVerificationwithStatic() throws Exception {  

    Customer customer = new Customer();

    PaltformRuntime instance = Mockito.mock(PaltformRuntime.class, RETURNS_DEEP_STUBS);
    when(instance.getElementRegistry().getElement()).thenReturn(customer);

    PowerMockito.mockStatic(PaltformRuntime.class);
    PowerMockito.when(PaltformRuntime.getInstance()).thenReturn(instance);

    CustomerManagementService customerManagementService=new CustomerManagementService();
    String result = customerManagementService.fluentApiVerificationWithStatic();

    assertEquals(customer.getName(), result);
}

如何使用静态方法调用来模拟流畅的api？

1 个答案: