1 package com.ives;
 2 import java.util.*;
 3 import com.ives.Input;
 4 public class Expression {
 5     int a;
 6     int b;
 7     static int c;//用户答案
 8     int answer;//答案
 9     static Scanner in=new Scanner(System.in);
10 
11 
12 public int Expression(){
13     a = new Random().nextInt()%10;
14     b = new Random().nextInt()%10;
15     System.out.print(""+a+"+"+b+"=");
16     return answer = a + b;
17 
18 }
19 public static void main(String[] args){
20     int answer;
21     Expression expression = new Expression();
22     
23     answer = expression.Expression();
24     Input input = new Input();
25     Expression.c = input.a;
26     if(answer==c)
27     {
28         System.out.print("答对了");
29     }
30     else System.out.print("答错了");
31     //System.out.print("answer="+answer);
32 }
33 }

 1 package com.ives;
 2 import static org.junit.Assert.*;
 3 
 4 import org.junit.Test;
 5 
 6 
 7 public class ExpressionTest {
 8 
 9     @Test
10     public void testExpression() {
11         int a;
12         Expression test = new Expression();
13         a = test.Expression();
14         assertEquals(a, test.answer);
15     } 
16 }