@Test
public void tryToParseDurationWithNegativeAmountAndSuffix() {

    final String durationString = "-15s";
    assertThatExceptionOfType(IllegalArgumentException.class)
            .isThrownBy(() -> DittoDuration.parseDuration(durationString))
            .withMessage("The duration must not be negative but was <%s>!", durationString)
            .withNoCause();
}