无涯教程-JUnit - 基本用法现在让无涯教程有一个基本示例，以演示使用JUnit的分步过程。创建测试类在C:\

现在让无涯教程有一个基本示例，以演示使用JUnit的分步过程。

创建测试类

在C:\> JUNIT_WORKSPACE中创建一个要测试的Java类，例如MessageUtil.java

/*
* 此类在控制台上打印给定的消息。
*/
public class MessageUtil {
private String message;
//构造函数
//@param message to be printed
public MessageUtil(String message){
this.message = message;
}
//打印消息
public String printMessage(){
System.out.println(message);
return message;
}

}

实例化测试类

在C:\> JUNIT_WORKSPACE中创建一个Java类文件名称TestJunit.java。

import org.junit.Test;
import static org.junit.Assert.assertEquals;
public class TestJunit {
String message = "Hello World";
MessageUtil messageUtil = new MessageUtil(message);
@Test
public void testPrintMessage() {
assertEquals(message,messageUtil.printMessage());
}
}

创建执行类

在C:\> JUNIT_WORKSPACE中创建一个名为TestRunner.java的Java类文件以执行测试用例。

import org.junit.runner.JUnitCore;
import org.junit.runner.Result;
import org.junit.runner.notification.Failure;
public class TestRunner {
public static void main(String[] args) {
Result result = JUnitCore.runClasses(TestJunit.class);
  </span><span class="kwd">for</span><span class="pln"> </span><span class="pun">(</span><span class="typ">Failure</span><span class="pln"> failure </span><span class="pun">:</span><span class="pln"> result</span><span class="pun">.</span><span class="pln">getFailures</span><span class="pun">())</span><span class="pln"> </span><span class="pun">{</span><span class="pln">
     </span><span class="typ">System</span><span class="pun">.</span><span class="kwd">out</span><span class="pun">.</span><span class="pln">println</span><span class="pun">(</span><span class="pln">failure</span><span class="pun">.</span><span class="pln">toString</span><span class="pun">());</span><span class="pln">
  </span><span class="pun">}</span><span class="pln">
	
  </span><span class="typ">System</span><span class="pun">.</span><span class="kwd">out</span><span class="pun">.</span><span class="pln">println</span><span class="pun">(</span><span class="pln">result</span><span class="pun">.</span><span class="pln">wasSuccessful</span><span class="pun">());</span><span class="pln">

}
}

使用javac编译MessageUtil，测试用例和测试运行器类。

C:\JUNIT_WORKSPACE>javac MessageUtil.java TestJunit.java TestRunner.java

现在运行Test Runner，它将运行在提供的Test Case类中定义的测试用例。

C:\JUNIT_WORKSPACE>java TestRunner

验证输出。

Hello World
true

现在，在C:\> JUNIT_WORKSPACE中更新TestJunit，以使测试失败。更改消息字符串。

import org.junit.Test;
import static org.junit.Assert.assertEquals;
public class TestJunit {
String message = "Hello World";
MessageUtil messageUtil = new MessageUtil(message);
@Test
public void testPrintMessage() {
message = "New Word";
assertEquals(message,messageUtil.printMessage());
}
}

让无涯教程将其余的类保持不变，并尝试运行相同的Test Runner。

import org.junit.runner.JUnitCore;
import org.junit.runner.Result;
import org.junit.runner.notification.Failure;
public class TestRunner {
public static void main(String[] args) {
Result result = JUnitCore.runClasses(TestJunit.class);
  </span><span class="kwd">for</span><span class="pln"> </span><span class="pun">(</span><span class="typ">Failure</span><span class="pln"> failure </span><span class="pun">:</span><span class="pln"> result</span><span class="pun">.</span><span class="pln">getFailures</span><span class="pun">())</span><span class="pln"> </span><span class="pun">{</span><span class="pln">
     </span><span class="typ">System</span><span class="pun">.</span><span class="kwd">out</span><span class="pun">.</span><span class="pln">println</span><span class="pun">(</span><span class="pln">failure</span><span class="pun">.</span><span class="pln">toString</span><span class="pun">());</span><span class="pln">
  </span><span class="pun">}</span><span class="pln">
	
  </span><span class="typ">System</span><span class="pun">.</span><span class="kwd">out</span><span class="pun">.</span><span class="pln">println</span><span class="pun">(</span><span class="pln">result</span><span class="pun">.</span><span class="pln">wasSuccessful</span><span class="pun">());</span><span class="pln">

}
}

现在运行Test Runner，它将运行在提供的Test Case类中定义的测试用例。

C:\JUNIT_WORKSPACE>java TestRunner

验证输出。

Hello World
testPrintMessage(TestJunit): expected:<[New Wor]d> but was:<[Hello Worl]d>
false

无涯教程-JUnit - 基本用法

创建测试类

实例化测试类

创建执行类

参考链接