Question

我正在尝试编写一个基本的JUnit教程，我正在使用一个基本服务层的简单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，并说明我如何解决这个问题？

JUnit错误

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

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HelloWorldMessageServiceImplementation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());
    }

}

Answer 1

问题是在println()课程中使用HelloWorldMessageServiceImplemenation。此函数将回车符\n添加到字符串的末尾，导致输出与控制数据不匹配。将此更改为print()方法，或将回车符添加到测试字符串的末尾。

将回车添加到测试控制数据的正确方法如下

controlMessageContent = new String("Hello World\n");

在JUnit中断言正确的控制台输出

1 个答案: