import org.junit.Test;
import org.junit.Assert;
import junit.framework.TestCase;public class CalculatorTest extends TestCase {//所有的终值误差在1.0以内算是正确的@Testpublic void testFuli(){Calculator4 k=new Calculator4();double money=1000000;double rate=0.03;int years=30;double sum;sum=money*(Math.pow(1+rate, years));System.out.println("sum="+sum);Assert.assertEquals(2427262, sum,1.0);}@Testpublic void testPrincipal(){Calculator4 k=new Calculator4();double sum=3000000;int years=30;double rate=0.03;double money;money=sum/(Math.pow(1+rate, years));System.out.println("money="+money);Assert.assertEquals(1235960, money,1.0);}@Testpublic void testStock(){Calculator4 k=new Calculator4();double money=1000000;double sum=3000000;double rate=0.03;int years;years=(int) ((Math.log(sum)/Math.log(1+rate))-(Math.log(money)/Math.log(1+rate)));System.out.println("years="+years);Assert.assertEquals(37, years,1.0);}@Testpublic void testRate(){Calculator4 k=new Calculator4();double money=1000000;double sum=3000000;int years=30;double rate;rate=sum/(money*years);System.out.println("rate="+rate);Assert.assertEquals(0.1, rate,1.0);}@Testpublic void testAssets(){Calculator4 k=new Calculator4();double money=1000000;double rate=0.03;int years=30;double sum1;sum1=money*rate*years;System.out.println("sum1="+sum1);Assert.assertEquals(900000.0, sum1,1.0);}@Testpublic void testRepayment(){Calculator4 k=new Calculator4();double money=1000000;double rate=0.03;int years=10;double sum2;double i=rate/12;int month=years*12;sum2=money*i*Math.pow(1+i, month)/(Math.pow(1+i,month)-1);System.out.println("sum2="+sum2);Assert.assertEquals(9656, sum2,1.0);}
}