@Test
    public void shouldReturnBooleanWhenFalseStringIsSupplied() throws Exception {
      BooleanField field =
          new BooleanField(new HashMap<String, Object>(), _spanishLocale, _usLocale);

      assertFalse(field.convertFromString("false"));
    }
    @Test
    public void shouldReturnNullWhenNullStringIsSupplied() throws Exception {
      BooleanField field =
          new BooleanField(new HashMap<String, Object>(), _spanishLocale, _usLocale);

      assertNull(field.convertFromString(null));
    }