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我正在尝试编写一个基本的 JUnit 教程，并通过一个使用基本服务层的简单 Hello World 示例来演示这一点。我的问题是，即使测试输出与我的控制数据匹配，assertEquals 仍然返回 false。你能解释一下为什么 assertEquals 不起作用，并说明我该如何解决这个问题吗？

JUnit 错误

org.junit.ComparisonFailure: expected:<Hello World[]> but was:<Hello World[
]>

还有我的代码测试样本

package com.springtutorial.mavenhelloworld.service;

import static org.junit.Assert.*;

import org.junit.Before;
import org.junit.BeforeClass;
import org.junit.Rule;
import org.junit.Test;
import org.junit.contrib.java.lang.system.StandardOutputStreamLog;

import com.springtutorial.junitandmavenhelloworld.service.HelloWorldMessage;
import com.springtutorial.junitandmavenhelloworld.service.HelloWorldMessageImplementation;
import com.springtutorial.junitandmavenhelloworld.service.HelloWorldMessageService;
import com.springtutorial.junitandmavenhelloworld.service.HelloWorldMessageServiceImplementation;

public class HelloWorldMessageServiceImplementationTest
{
    static String controlMessageContent;
    static HelloWorldMessage controlMessage;

    HelloWorldMessage testMessage;
    HelloWorldMessageService testMessageService;

    @Rule
    public final StandardOutputStreamLog testLog = new StandardOutputStreamLog();

    @BeforeClass
    public static void setUpBeforeClass() throws Exception
    {
    controlMessageContent = new String("Hello World");
    controlMessage = new HelloWorldMessageImplementation(controlMessageContent);
    }

    @Before
    public void setUp() throws Exception
    {
    testMessage = new HelloWorldMessageImplementation("Hello World");
    testMessageService = new HelloWorldMessageServiceImplementation(testMessage);
    }

    @Test
    public void testGetMessage()
    {
    assertEquals(testMessage, testMessageService.getMessage());
    }

    @Test
    public void testSetMessage()
    {
    testMessageService.setMessage(new HelloWorldMessageImplementation("Test Message"));
    assertEquals("Test Message", testMessageService.getMessage().getMessageAsString());
    }

    @Test
    public void testPrintMessageToConsole()
    {
    testMessageService.printMessageToConsole();
    assertEquals(controlMessageContent, testLog.getLog());
    }
}

我的 HelloWorldMessageService 实现代码

package com.springtutorial.junitandmavenhelloworld.service;

public class HelloWorldMessageServiceImplementation implements
    HelloWorldMessageService
{
    HelloWorldMessage message;

    public HelloWorldMessageServiceImplementation(HelloWorldMessage newMessage)
    {
    super();
    this.setMessage(newMessage);
    }

    public HelloWorldMessage getMessage()
    {
    return this.message;
    }

    public void setMessage(HelloWorldMessage newMessage)
    {
    this.message = newMessage;
    }

    public void printMessageToConsole()
    {
    System.out.println(this.message.getMessageAsString());
    }

}
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1 回答 1

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问题是println()在HelloWorldMessageServiceImplemenation课堂上的使用。此函数在字符串末尾添加一个回车\n符，导致输出与控制数据不匹配。要么将此更改为print()方法，要么在测试字符串的末尾添加一个回车符。

在测试控制数据中添加回车的正确方法如下

controlMessageContent = new String("Hello World\n");
于 2013-03-21T05:09:51.243 回答