@Test
    public void testAlphaLower() {
        assertEquals("a", AutoPageNumberUtils.asAlphaNumericLower(1));
        assertEquals("z", AutoPageNumberUtils.asAlphaNumericLower(26));
        assertEquals("aa", AutoPageNumberUtils.asAlphaNumericLower(27));
        assertEquals("zz", AutoPageNumberUtils.asAlphaNumericLower(52));
        assertEquals("aaa", AutoPageNumberUtils.asAlphaNumericLower(53));
        assertEquals("zzz", AutoPageNumberUtils.asAlphaNumericLower(78));
    }
Check lower-case alpha-numeric numbers are generated based on the
input page number.
tika-parsers/tika-parsers-standard/tika-parsers-standard-modules/tika-parser-apple-module/src/test/java/org/apache/tika/parser/iwork/AutoPageNumberUtilsTest.java