The simplest use of java test unit JUnit

Just write a small introduction and simply output text. First, create a MessageUtil class for testing (recommended learning: java course)

package com.test.jiao;

public class MessageUtil {

    private String message;

    public MessageUtil(String message){
        this.message = message;
    }

    public String printMessage(){
        System.out.println(message);
        return message;
    }
}

Then, create a TestCase class, named TestJunit, and use assertEquals () to execute during testing

package com.test.jiao;

import org.junit.Test;
import static org.junit.Assert.assertEquals;

public class TestJunit {

    String message = "Hello Jiao, Junit is working!";
    MessageUtil messageUtil = new MessageUtil(message);

    @Test
        public void testPrintMessage(){
        //Junit 的 assertEquals API 执行测试
        assertEquals(message,messageUtil.printMessage());
        }
}

Finally, create a startup class TestRunner, which uses the runClasses method of JUnit's JUnitCore class to test

package com.test.jiao;

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){
        //运用JUnit的JUnitCore类的runClasses方法来测试
        Result result = JUnitCore.runClasses(TestJunit.class);
        //获取测试结果
        for(Failure failure : result.getFailures()){
            System.out.println(failure.toString());
        }
        System.out.println(result.wasSuccessful());
    }
}

OK, now run TestRunner to see the results (●'◡'●)

Success!

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