test/jp/co/areaweb/tools/core/TestTax.java

   1 /*
   2  * Created on 2005/06/09
   3  *
   4  */
   5 package jp.co.areaweb.tools.core;
   6
   7 import jp.co.areaweb.tools.core.Tax;
   8 import junit.framework.TestCase;
   9
  10 /**
  11  * @author y_hayashi
  12  *
  13  */
  14 public class TestTax extends TestCase {
  15
  16         /**
  17          * テスト１
  18          * 総額から税引き価格を求める
  19          */
  20         public void test001() throws Exception {
  21                 assertEquals(95L, Tax.calcBody(100L));
  22                 assertEquals(5L, Tax.calcTax(100L));
  23                 assertEquals(5L, Tax.toTax(95L));
  24                 assertEquals(100L, Tax.toTotal(95L));
  25         }
  26
  27         /**
  28          * テスト2
  29          * 端数は四捨五入されること
  30          */
  31         public void test002() throws Exception {
  32                 assertEquals(99L, Tax.calcBody(104L));          // 99.04
  33                 assertEquals(5L, Tax.calcTax(104L));
  34                 assertEquals(100L, Tax.calcBody(105L));         // 100.0
  35                 assertEquals(5L, Tax.calcTax(105L));
  36                 assertEquals(101L, Tax.calcBody(106L));         // 100.9
  37                 assertEquals(5L, Tax.calcTax(106L));
  38                 assertEquals(102L, Tax.calcBody(107L));         // 101.9
  39                 assertEquals(5L, Tax.calcTax(106L));
  40
  41                 assertEquals(5L, Tax.toTax(99L));
  42                 assertEquals(104L, Tax.toTotal(99L));
  43                 assertEquals(5L, Tax.toTax(100L));
  44                 assertEquals(105L, Tax.toTotal(100L));
  45                 assertEquals(5L, Tax.toTax(101L));
  46                 assertEquals(106L, Tax.toTotal(101L));
  47                 assertEquals(5L, Tax.toTax(102L));
  48                 assertEquals(107L, Tax.toTotal(102L));
  49         }
  50
  51         /**
  52          * テスト3
  53          * 10兆円までは計算できる。
  54          */
  55         public void test003() throws Exception {
  56                 try {
  57                         assertEquals(9523809523810L, Tax.calcBody(10000000000000L));
  58                         assertEquals(476190476190L, Tax.calcTax(10000000000000L));
  59                         assertEquals(500000000000L, Tax.toTax(10000000000000L));
  60                         assertEquals(10500000000000L, Tax.toTotal(10000000000000L));
  61                 }
  62                 catch (Exception e) {
  63                         fail();         // 例外が発生
  64                 }
  65         }
  66
  67         /**
  68          * テスト4
  69          * 数値が負の場合
  70          */
  71         public void test004() throws Exception {
  72                 assertEquals(-95L, Tax.calcBody(-100L));
  73                 assertEquals(-5L, Tax.calcTax(-100L));
  74                 assertEquals(-5L, Tax.toTax(-95L));
  75                 assertEquals(-100L, Tax.toTotal(-95L));
  76         }
  77 }