Use JUnit to write test cases in eclipse

Eclipse comes with the JUnit plug-in, which makes it easy to write test cases in a project without having to install them.

Add a JUnit library to your project

Before you can write test cases, you need to introduce JUnit first. Right-click on the project root, select Properties,java Build path,libraries,

Add Library, select JUnit:

Click Next to select the JUnit version, then finish is introduced.

Writing test Cases

Suppose you have the following classes:

package choon.test;
 
public class Calculate {
    public int  Add(int x,int y) {
        return x + y;
    }
}

You can write test cases like this:

package choon.test;
 
import static org.junit.Assert.*;
 
import org.junit.Test;
 
public class Test1 {
 
    @Test
    public void test() {
        Calculate calculate = new Calculate();
        assertEquals(8, calculate.Add(3, 5));
    }
     
}

, the green status bar indicates that the test passed, and if it is red, it does not pass.

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Before and after tags

The methods marked by before are executed before each test case executes, and the after-tagged method executes after each test case executes.

If you write the following test case:

package choon.test;
 
import static org.junit.Assert.*;
 
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
 
public class Test1 {
    @Before
    public void setUp() {
        System.out.println("---begin test---");
    }
     
    @Test
    public void test() {
        Calculate calculate = new Calculate();
        assertEquals(8, calculate.Add(3, 5));
        System.out.println("test case");
    }
     
    @After
    public void tearDown() {
        System.out.println("---end test---");
    }
}

The following results will be executed:

It is important to write test cases, a bad test case is not a test and a waste of time, and a good test case can be very good to point out the problem in the code, to avoid greater trouble.