如何上手EasyMock？

在Eclipse上创建Project， MockTest

创建Interface

 public interface IStudent {
     public String doMethod1();
     public String doMethod2();
     public String doMethod3();

 }

创建被测类

 public class StudentApplication {
     IStudent student=null;
     public StudentApplication(IStudent student) {
         this.student = student;
     }

     public String doMethod(){
         String str1=student.doMethod1();
         String str2=student.doMethod2();
         String str3=student.doMethod3();
         return str1+str2+str3;
     }
 }

在Eclipse里右键点击 StudentApplication.java，点New，选JUnit Test Case

同意导入JUnit4库

下载Easy Mock

https://sourceforge.net/projects/easymock/?source=typ_redirect

右键选择项目，点属性，Java Build Path -> Libraries ->Add External Jar, 找到解压后的easymock-3.2.jar

修改StudentApplicationTest.java如下。

 import main.IStudent;
 import main.StudentApplication;
 import org.easymock.EasyMock;
 import org.junit.Assert;
 import org.junit.Test;


 public class StudentApplicationTest {
     IStudent student;
     StudentApplication application;
     @Test
     public void testdoMethod(){
         //•使用 EasyMock 生成 Mock 对象；
         student=EasyMock.createMock(IStudent.class);
         //设定 Mock 对象的预期行为和输出
         EasyMock.expect(student.doMethod1()).andReturn("a").times(1);
         EasyMock.expect(student.doMethod2()).andReturn("b").times(1);
         EasyMock.expect(student.doMethod3()).andReturn("c").times(1);
         //将 Mock 对象切换到 Replay 状态
         EasyMock.replay(student);
         //调用 Mock 对象方法进行单元测试
         application=new StudentApplication(student);
         String getStr=application.doMethod();
         //对 Mock 对象的行为进行验证
         String cstr="abc";//正确的字符串
         Assert.assertEquals(cstr，getStr);
         EasyMock.verify(student);

     }
 }

右键点击StudentApplicationTest.java，Run As -> JUnit Test

注：以上代码来自网络，有少许修改。