单体测试使用Assert.assertThat(expected，Matcher matcher)来对比结果和预期

hamcrest core 1.3.jar和junit 4.12.jar

JUnit4.11和hamcrest-core-1.3 搭建自己的测试环境（非eclipse内置Junit）

Hamcrest Library 1.3

Hamcrest Core 1.3

Hamcrest All 1.3

package test.Demo;

import org.hamcrest.Matchers;
import org.junit.Assert;
import org.junit.Test;


public class CalculatorTest {

    @Test
    public void add() {
        int result = new Calculator().add(1,3);
        Assert.assertEquals(4,result);
    }

    @Test
    public void sub() {
        int result = new Calculator().sub(1,3);
        Assert.assertEquals(-2,result);
    }

    @Test
    public void divide(){
        int result = new Calculator().divide(3,1);
        Assert.assertThat(result, Matchers.is(4));
    }
}

package test.Demo;

public class Calculator {
    public int add(int a, int b) {
        return a + b;
    }

    public int sub(int a, int b) {
        return a - b;
    }

    public int divide(int a,int b){
        return a/b;
    }
}