在Android Studio环境下使用JUNIT框架进行单元测试

1.首先, 在gradle里面添加Junit的支持:

2.然后建立一个类，在里面写计算数组的子数组的最大值的方法

package com.example.pj.git;

import java.util.Scanner;

/**
 * Created by pj on 2017/3/13.
 */
public class Array {
    public static void main(String[] args){
        Array i =new Array();
        int Max;
        int Max1 = 0;
        Scanner in=new Scanner(System.in);
        System.out.print("请输入数组的长度：");
        int j=in.nextInt();
        System.out.print("请依次输入数组：");
        int Array[]=new int[j];
        for(int a = 0;a < j; a++){
            Array[a]=in.nextInt();
        }
        int Arr1[]=new int [j];
        for(int a = 0; a < j; a++) {
            for(int b = 0; b < j; b++){
                Arr1[b]=Array[(b + a)%(j)];
            }
            Max=i.findMaxArray(Arr1);
            if(Max > Max1) {
                Max1 = Max;
            }
        }
        System.out.print("最大的子数组和为"+Max1);
    }
    public int findMaxArray(int[] arr) {
        int Arr = 0;
        int MaxArr = 0;
        int c = arr.length;
        int Location1;
        int Location2=0;
        int a;

        for ( a = 0; a < c; a++) {
            Arr += arr[a];
            if (Arr < 0) {
                Arr = 0;
            }
            if (Arr > MaxArr) {
                MaxArr = Arr;
            }
        }

        for(a = Location2; a >= 0; a--) {
            if(MaxArr-arr[a]==0) {
                Location1 = a;
                break;
            }
        }
        if (MaxArr == 0) {
            for ( a = 0; a < c; a++) {
                if (a == 0) {
                    MaxArr = arr[a];
                }
                if (arr[a] > MaxArr) {
                    MaxArr = arr[a];
                }
            }
        }
        return MaxArr;
    }
}
3.在测试类中,编写测试用例,使用assertEquals方法判断被测试类的运行是否正确

package com.example.pj.git;

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

import static org.junit.Assert.*;

/**
 * Created by pj on 2017/3/17.
 */
public class ArrayTest {
    private Array mArray;
    int[] Array = {-1,2,-5,3,-4};
    @Before
    public void setUp() throws Exception {
        mArray = new Array();
    }

    @After
    public void tearDown() throws Exception {

    }

    @Test
    public void testFindMaxArray() throws Exception {
        assertEquals(3, mArray.findMaxArray(Array), 0);
    }