mockito5.4.0单元测试(13) --捕获mock对象调用某方法时的参数ArgumentCaptor，断言其参数值

mockito官方文档地址：https://www.javadoc.io/doc/org.mockito/mockito-core/latest/org/mockito/Mockito.html#captors

先准备两个dto类：

@Slf4j
@Data
@Builder
@NoArgsConstructor
@AllArgsConstructor
@JsonInclude(JsonInclude.Include.NON_NULL)
public class ResearchDto implements Serializable {

    private static final long serialVersionUID = -8610563322176923066L;

    private Long id;
    private String username;
    private Research2Dto research2Dto;

}

@Slf4j
@Data
@Builder
@NoArgsConstructor
@AllArgsConstructor
@JsonInclude(JsonInclude.Include.NON_NULL)
public class Research2Dto implements Serializable {

    private static final long serialVersionUID = -8610563322176923066L;

    private Long id;
    private String username;

}

 

case 1:

@Test
public void test_ArgumentCaptor_case1() {
    // mock一个对象
    List singleMock = mock(List.class);
    // 调用一次add，放入"zhangsan"
    singleMock.add("zhangsan");

    // 如果这一行代码去掉注释被执行的话，那么执行到这一行：verify(singleMock).add(argument.capture())会报错：Wanted 1 time: xxx, But was 2 times: xxx.
    // 意思是应该只调用一次add方法，但实际上调用了两次add方法。
    //singleMock.add("lisi");

    ArgumentCaptor<String> argument = ArgumentCaptor.forClass(String.class);
    // 验证mock对象调用add方法时的参数类型
    verify(singleMock).add(argument.capture());
    // 断言mock对象调用add方法时的参数等于"zhangsan"，而非其他值
    assertEquals("zhangsan", argument.getValue());

}

case 2:

    @Test
    public void test_ArgumentCaptor_case2() {
        // mock一个对象
        ResearchDto dtoMock = mock(ResearchDto.class);
        dtoMock.setUsername("myname123");

        Research2Dto research2Dto = new Research2Dto();
        research2Dto.setUsername("research2Dto_username");
        dtoMock.setResearch2Dto(research2Dto);

//        ArgumentCaptor<ResearchDto> argument = ArgumentCaptor.forClass(dtoMock.getClass());
        ArgumentCaptor<Research2Dto> argument = ArgumentCaptor.forClass(Research2Dto.class);
        // 捕获mock对象调用setResearch2Dto方法时的参数类型，即argument.capture()应该是Research2Dto对象
        verify(dtoMock).setResearch2Dto(argument.capture());
        // 断言mock对象调用调用setResearch2Dto方法时的参数，即research2Dto对象的username等于值"research2Dto_username"，而非其他值
        assertEquals("research2Dto_username", argument.getValue().getUsername());
    }

 

end.