@Test
  public void 現在時刻が20120201の場合_getRemainginDaysは28を返す() {
    MonthlyCalendar sut = new MonthlyCalendar(newCalendar(2012, 2, 1));

    assertThat(sut.getRemainginDays(), is(28));
  }
  @Test
  public void 現在時刻が20120130の場合_getRemainginDaysは1を返す() {
    MonthlyCalendar sut = new MonthlyCalendar(newCalendar(2012, 1, 30));

    assertThat(sut.getRemainginDays(), is(1));
  }