JUnit unit test

Test categories ：

1. Black box testing ： No need to write code , Give input value , See if the output is the expected value .

2. White box testing ： Need to write code , Pay attention to the specific implementation process of the program , such as ：junit unit testing .

Junit Test use ：

step ：

1. Define a test class （ The test case ）

Suggest ： Test class name ： Class name of the tested class Test CalulatorTest

Package name :xxx.xxx.xx.test cn.itcast.test

2. Define test methods ： Can run independently

Suggest ： Method name ：test Test method name testAdd()

Return value :void

parameter list ： Empty ginseng

3. Add to the method @test

4. Import junit rely on

public class CalculatorTest {
    /* test add Method 
    * */
    @Test
    public void testadd(){
        //1. Create a computer object 
        Calculator  c=new Calculator();
        //2. call add Method 
        int result = c.add(12, 12);
      //  System.out.println(result);
        //3. Assertion , I assert that the result is 3
        Assert.assertEquals(24,result);
    }
}

result ：

24