EmailFieldFormat { public static String nullValue() { return NULL; }  static UnaryOperator<String> textFormatterFrom(@NonNull final LoggingStrategy loggingStrategy); static Function<InternetAddress, String> emailFormatterFrom(@NonNull final LoggingStrategy loggingStrategy); static Function<Locale, String> localeFormatterFrom(@NonNull final LoggingStrategy loggingStrategy); static Function<Date, String> dateFormatterFrom(@NonNull final LoggingStrategy loggingStrategy); static String plainText(final Locale locale); static String plainText(final InternetAddress internetAddress); static String plainText(final String text); static String firstDozenThenStars(final InternetAddress internetAddress); static String firstDozenThenStars(final String text); static String textFromAt(final InternetAddress internetAddress); static String textFromAt(final String text); static String textUpToAt(final InternetAddress internetAddress); static String textUpToAt(final String text); static String dateFormat(final Date date); static String dateFormatWithZoneId(final Date date); static String nullValue();  }
@Test public void shouldNullBeConstant() { String expectedValue = "NULL"; String givenValue = EmailFieldFormat.nullValue(); assertions.assertThat(givenValue).isEqualTo(expectedValue); }