Lab 1 Junit and Eclemma-优快云博客

本文介绍了如何在Eclipse中安装JUnit和Hamcrest，并使用这些工具进行单元测试的方法。通过一个具体的例子——判断三角形类型的问题，展示了如何编写Java代码并使用JUnit进行测试。文章还详细说明了安装Eclemma插件的过程。

Tasks:

1.Install Junit(4.12), Hamcrest(1.3) with Eclipse
2.Install Eclemma with Eclipse
3.Write a java program for the triangle problem and test the program with Junit.

　　　　a) Description of triangle problem: Function triangle takes three integers a,b,c which are 　　　　　length of triangle sides; calculates whether the triangle is equilateral, isosceles, or scalene.

Solutions:

1. installation:

a) Firstly, open a java project, enter the 'Java Build Path' menu, then click button 'Add External JARs', choose Junit and Hamcrest JARs which I have downloaded from a website somewhere, then the plugins will be successfully imported.

b) Open Eclipse Marketplace, in which you can search Eclemma plugin, then install it. After a restart of Eclipse, the Eclemma plugin has been successfully intalled.

2. Triangle Problem:

Triangle.java (Original Code)

package sjh;

public class triangle {
    public double a, b, c;
    public triangle(){
        this.a = 1;
        this.b = 1;
        this.c = 1;
    }
    public void setSide(double a, double b, double c){
        this.a = a;
        this.b = b;
        this.c = c;
        try{
            if(a>0&&b>0&&c>0&&a+b>c&&b+c>a&&a+c>b){            
                //nothing will happen
            }
            else{
                //not a triangle
                throw new Exception();
            }
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
    public boolean ifEquilateral(){
        if(a == b && b == c){
            return true;
        }
        else {
            return false;
        }
    }
    public boolean ifIsosceles(){
        if(a == b || b == c || a == c){
            return true;
        }
        else {
            return false;
        }
    }
    public boolean ifScalene(){
        if(a != b && b != c && a != c){
            return true;
        }
        else {
            return false;
        }
    }
}

TriangleTest.java (Testing Code)

package sjh;

import static org.junit.Assert.*;

import org.junit.After;
import org.junit.Before;
import org.junit.Test;

public class triangleTest {
    private static triangle tri = new triangle();
    
    @Before
    public void setUp() throws Exception {
        
    }

    @After
    public void tearDown() throws Exception {
    
    }

    @Test
    public void testIfEquilateral() {
        tri.setSide(1.0, 1.0, 1.0);
        assertEquals(tri.ifEquilateral(), true);    
    }

    @Test
    public void testIfIsosceles() {
        tri.setSide(1.5, 2.0, 2.0);        
        assertEquals(tri.ifIsosceles(), true);

    }

    @Test
    public void testIfScalene() {
        tri.setSide(1.0, 1.5, 2.0);
        assertEquals(tri.ifScalene(), true);
    }

}

The testing code tests 3 functions from the original one, IfEquilateral(), IfIsosceles() and IfScalene().

Then we will get: