运行环境Android studio

Mockito的一些常用功能

验证测试中的某些行为

//Let's import Mockito statically so that the code looks clearer
import static org.mockito.Mockito.*;

//mock creation 
List mockedList = mock(List.class);

//using mock object 
mockedList.add("one"); 
mockedList.clear();

//verification 
verify(mockedList).add("one");  //等价于     
verify(mockedList,times(1)).add("one");
verify(mockedList).clear();

当我们添加这些代码时,单元测试输出控制台不会有输出,显示状态也是:

successed.png

一旦Mock对象被创建了,Mock就会记录我们队Mock的操作,例如我们写了mockedList.add("one");
之后调用verify(mockedList).add("one"); 就说明我们执行了一次mockedList.add("one")语句,

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** 后续我们会详细介绍verify函数 **

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添加测试桩(Stub)

//You can mock concrete classes, not just interfaces(你可以mock具体的类型,不仅只是接口) 
//List是接口 LinkedList是具体的类型
LinkedList mockedList = mock(LinkedList.class);

//stubbing 测试桩,在调用get(0)时返回"first"
when(mockedList.get(0)).thenReturn("first");
//stubbing 测试桩,在调用get(1)时抛出异常
when(mockedList.get(1)).thenThrow(new RuntimeException());

//following prints "first"
System.out.println(mockedList.get(0));

//following throws runtime exception 
System.out.println(mockedList.get(1)); 

//following prints "null" because get(999) was not stubbed 
System.out.println(mockedList.get(999));