Lab1：Junit and Eclemma

Posted 2020-09-03

a）安装junit和hamcrest：

在网上搜素并下载junit-4.12.jar 和 hamcrest-core-1.3.jar 两个jar包，在项目里创建一个lib文件夹将jar包放进去，再右键选择这两个jar包，选择Build Path->add to build path 即可。

安装eclemma：

点击eclipse的help，选择eclipse marketplace， 在find框里搜索eclemma并按照指示安装即可。

b）本次实验要实现一个三角形问题并测试，根据输入的三条边长度判断是否是等边、等腰或不等边三角形。实现代码如下：

package com.triangle;

public class Triangle {
    public String testTriangle(double a, double b, double c) {
        if (a + b > c && a + c > b && b + c > a) {
            if (a == b && b == c) {
                return "equilateral";
            } else if (a != b && b != c && a != c) {
                return "scalene";
            } else
                return "isosceles";
        } else
            return "not a triangle";
    }
}

对里面的方法建立junit测试类，代码如下：

package com.triangle;

import static org.junit.Assert.assertEquals;

import java.util.Arrays;
import java.util.Collection;

import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.Parameterized;
import org.junit.runners.Parameterized.Parameters;

@RunWith(Parameterized.class)
public class TriangleTest {
    private double a;
    private double b;
    private double c;
    private String expected;
    private Triangle t;

    @Before
    public void setUp() throws Exception {
        t = new Triangle();
    }

    public TriangleTest(double a, double b, double c, String expected) {
        this.a = a;
        this.b = b;
        this.c = c;
        this.expected = expected;
    }

    @Parameters
    public static Collection<Object[]> getData() {
        return Arrays.asList(new Object[][] { { 1, 1, 2, "not a triangle" }, { 2, 3, 2, "isosceles" },
                { 3, 3, 3, "equilateral" }, { 3, 4, 5, "scalene" } });
    }

    @Test
    public void testTestTriangle() {
        assertEquals(this.expected, t.testTriangle(a, b, c));

    }

}

这样可以一次性测试多个测试用例，我分别设置了四种情况，测试结果如下：