PowerMock学习(九)之Mock Answer的使用
关于Mock Answer
上一篇文章,有介绍过关于Arguments Matche的使用,其实 Answer的作用与其比较类似,但是它比 Arguments Matcher 更加强大。
Arguments Matche
即传入不同的参数,返回不同的结果,重在入参的判断,在入参重写方法去判断
Answer
见名知意,即返回不同的结果,但是根据传入参数去判断,在返回处重写方法去判断,返回结果
模拟场景
根据学生名字查找邮箱,controller调service层
service层
具体代码示例如下:
package com.rongrong.powermock.answers; /** * @author rongrong * @version 1.0 * @description: * @date 2019/12/4 20:24 */ public class StudentAnswerService { public String getEmail(String userName){ throw new UnsupportedOperationException(); } }
controller层
具体代码示例如下:
package com.rongrong.powermock.answers; /** * @author rongrong * @version 1.0 * @description: * @date 2019/12/4 20:24 */ public class StudentController { public String getEmail(String userName) { StudentAnswerService studentAnswerService = new StudentAnswerService(); return studentAnswerService.getEmail(userName); } }
上面的代码的业务代码比较简单了,下面再来进行测试
具体示例代码如下:
package com.rongrong.powermock.answers; import org.junit.Test; import org.junit.runner.RunWith; import org.mockito.Mockito; import org.mockito.invocation.InvocationOnMock; import org.mockito.stubbing.Answer; import org.powermock.api.mockito.PowerMockito; import org.powermock.core.classloader.annotations.PrepareForTest; import org.powermock.modules.junit4.PowerMockRunner; import static junit.framework.TestCase.assertEquals; import static junit.framework.TestCase.fail; /** * @author rongrong * @version 1.0 * @description: * @date 2019/12/4 20:34 */ @RunWith(PowerMockRunner.class) //准备调用层的类 @PrepareForTest(StudentController.class) public class TestStudentAnswerService { @Test public void testStudentAnswerService() { StudentAnswerService studentAnswerService = PowerMockito.mock(StudentAnswerService.class); PowerMockito.when(studentAnswerService.getEmail(Mockito.anyString())).then(new Answer<String>() { @Override public String answer(InvocationOnMock invocation) throws Throwable { String arg = (String) invocation.getArguments()[0]; if ("rr".equals(arg)) { return "rongrong@qq.com"; } else if ("jqj".equals(arg)) { return "jiuqujian@qq.com"; } throw new NullPointerException(); } }); try { PowerMockito.whenNew(StudentAnswerService.class).withAnyArguments().thenReturn(studentAnswerService); StudentController studentController = new StudentController(); String email = studentController.getEmail("rr"); assertEquals("rongrong@qq.com",email); email = studentController.getEmail("jqj"); assertEquals("jiuqujian@qq.com",email); email = studentController.getEmail("tony"); assertEquals("jiuqujian@qq.com",email); } catch (Exception e) { e.printStackTrace(); } } }
answer 接口中参数 InvocationOnMock使用
invocation.getArguments();(1) invocation.callRealMethod();(2) invocation.getMethod();(3) invocation.getMock();(4) (1)获取 mock 方法中传递的入参 (2)获取是那个真实的方法调用了该 mock 接口 (3)获取是那么 mock 方法被调用了 (4)获取被 mock 之后的对象
到此,关于mock中 Answer的使用介绍完,有兴趣的同学可以自己从上到下自己敲一遍。
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