@Test
    void testPluralSuffix_1b() {
        assertThat(pluralSuffix(1))
                .isEqualTo("");
        assertThat(pluralSuffix(2))
                .isEqualTo("s");
    }
Make sure the two functions are reversible
stroom-util-shared/src/test/java/stroom/util/shared/TestStringUtil.java