在JUnit中聲明正確的控制檯輸出

我正在嘗試編寫一個基本的JUnit教程，我用一個簡單的Hello World示例演示瞭如何使用基本服務層。我的問題是，即使測試輸出符合我的控制數據，assertEquals仍然返回false。你能解釋爲什麼assertEquals不工作，並說明我該如何解決這個問題？在JUnit中聲明正確的控制檯輸出

JUnit的錯誤

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

而且我的代碼測試樣品

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HelloWorldMessageServiceImplementation代碼

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()); 
    } 

}

來源

2013-03-21 cyotee

的問題是在HelloWorldMessageServiceImplemenation類使用println()。此函數將一個回車符\n添加到字符串的末尾，導致輸出與控制數據不匹配。將其更改爲print()方法，或將回車添加到測試字符串的末尾。

添加一個回車至該測試控制數據的正確方法如下

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

來源

2013-03-21 05:09:51 cyotee

在JUnit中聲明正確的控制檯輸出

回答

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