@Test
    void testPluralSuffix_1() {
        assertThat(StringUtil.plural("document", 1))
                .isEqualTo("document");
        assertThat(StringUtil.plural("document", 2))
                .isEqualTo("documents");
    }
Make sure the two functions are reversible
stroom-util-shared/src/test/java/stroom/util/shared/TestStringUtil.java