JUnit4 quick start study notes (1)

Demo directory structure

1. Create a new project (junit4Demo), build a package (com.imooc.util) under src, and create a new Calculate.java in the package

package com.imooc.util;

public class Calculate
{
    
    

    public int add(int a, int b)
    {
    
    
	return a + b;
    }

    public int subtract(int a, int b)
    {
    
    
	return a - b;
    }

    public int multiply(int a, int b)
    {
    
    
	return a * b;
    }

    public int devide(int a, int b)
    {
    
    
	return a / b;
    }
}

2. Import the unit test jar package: right click Build Path --> Add Libraries --> Junit --> Junit4

3. Create a new test class (CalculateTest.java): right-click the package where the test class is located: new --> JUnit Test Case

package com.imooc.util;

import static org.junit.Assert.assertEquals;

import org.junit.Test;

public class CalculateTest
{
    
    

    @Test
    public void add()
    {
    
    
    // assertEquals(预测值, 传参)
	assertEquals(6, new Calculate().add(3, 3));
    }

}

4. Run the test: CalculateTest right click --> Run as JUnit Test

5. Junit view: status bar (green-test successful; red-test failed)