TDD 程序代码（13）

TDD 程序代码（13）

TestMoney.java:
package com;

import junit.framework.TestCase;

public class TestMoney extends TestCase {
 public void testMultiplication() {
  Money five = Money.dollar(5);
  assertEquals(Money.dollar(10), five.times(2));
  assertEquals(Money.dollar(15), five.times(3));
 }

 public void testEqualsObject() {
  assertTrue(Money.dollar(5).equals(Money.dollar(5)));
  assertFalse(Money.dollar(5).equals(Money.dollar(6)));
  assertFalse(Money.franc(5).equals(Money.dollar(5)));
 }

 public void testCurrency() {
  assertEquals("USD", Money.dollar(1).currency());
  assertEquals("CHF", Money.franc(1).currency());
 }

 public void testSimpleAddition() {
  Money five = Money.dollar(5);
  Expression result = five.plus(five);
  Sum sum = (Sum) result;
  Bank bank = new Bank();
  Money reduced = bank.reduce(sum, "USD");
  assertEquals(Money.dollar(10), reduced);
 }

 public void testPlusReturnSum() {
  Money five = Money.dollar(5);
  Expression result = five.plus(five);
  Sum sum = (Sum) result;
  assertEquals(five, sum.augend);
  assertEquals(five, sum.addend);
 }

 public void testReduceSum() {
  Expression sum = new Sum(Money.dollar(3), Money.dollar(4));
  Bank bank = new Bank();
  Money result = bank.reduce(sum, "USD");
  assertEquals(Money.dollar(7), result);
 }
 public void testReduceMoney(){
  Bank bank = new Bank();
  Money result = bank.reduce(Money.dollar(1), "USD");
  assertEquals(Money.dollar(1),result);
 }
}