Junit單元測試的一個發現。

一個User類，重寫toString()方法。

package com.lele.test.mybatis.domain;

public class User {
	private Integer id;
	private String username;
	private Integer age;
	private String sex;
	private Company company;
	public Integer getId() {
		return id;
	}
	public void setId(Integer id) {
		this.id = id;
	}
	public String getUsername() {
		return username;
	}
	public void setUsername(String username) {
		this.username = username;
	}
	public Integer getAge() {
		return age;
	}
	public void setAge(Integer age) {
		this.age = age;
	}
	public String getSex() {
		return sex;
	}
	public void setSex(String sex) {
		this.sex = sex;
	}
	public Company getCompany() {
		return company;
	}
	public void setCompany(Company company) {
		this.company = company;
	}
	
	public String toString(){
		return "{\"id\":\""+id+"\",\"username\":\""+username+"\",\"age\":\""+age+"\",\"sex\":\""+sex+"\",\"company\":\""+company+"\"}";
	}
}

單元測試

package com.lele.test.ibatis;

import junit.framework.Assert;

import org.junit.Test;

import com.lele.test.mybatis.dao.UserDAO;
import com.lele.test.mybatis.dao.impl.UserDAOImpl;
import com.lele.test.mybatis.domain.User;

public class MybatisTest {
	
	@Test
	public void insertUser(){
		//UserDAO userDAO = new UserDAOImpl();
		User user = new User();
		user.setUsername("王二麻子");
		user.setAge(8);
		user.setSex("女");
		
		User user1 = new User();
		user1.setUsername("王二麻子");
		user1.setAge(8);
		user1.setSex("女");
		Assert.assertEquals(user,user1);
		//Assert.assertEquals(userDAO.addUser(user),userDAO.get(user.getId()));
		//System.out.println(user.getId());
	}
	
}

User1 與 User的賦值操作都是一樣的。運行Junit出錯，測試不通過。

junit.framework.AssertionFailedError: expected:<{"id":"null","username":"王二麻子","age":"8","sex":"女","company":"null"}> but was:<{"id":"null","username":"王二麻子","age":"8","sex":"女","company":"null"}>
	at junit.framework.Assert.fail(Assert.java:50)
	at junit.framework.Assert.failNotEquals(Assert.java:287)
	at junit.framework.Assert.assertEquals(Assert.java:67)
	at junit.framework.Assert.assertEquals(Assert.java:74)
	at com.lele.test.ibatis.MybatisTest.insertUser(MybatisTest.java:25)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:601)
	at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:45)
	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:42)
	at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
	at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:263)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:68)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:47)
	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:231)
	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:60)
	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:229)
	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:50)
	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:222)
	at org.junit.runners.ParentRunner.run(ParentRunner.java:300)
	at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:49)
	at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)

兩個字符串不想等。。。。

換成Assert.assertEquals(user.toString(),user1.toString());測試通過。

原因：打印錯誤信息時，會將對象toString(),但是我的toString()重寫了。產生了誤解。

Assert.assertEquals(user,user1);

這個時候判斷的是兩個OBJECT是否相等。