@Test
public void labelPlural() {

    assertEquals(Collections.singletonList(
            new NumberElement("10\u201312", CSLLabel.CHAPTER, true)),
            NumberParser.parse("chaps. 10-12"));
    assertEquals(Collections.singletonList(
            new NumberElement("10\u201312", CSLLabel.SECTION, true)),
            NumberParser.parse("secs. 10-12"));
    assertEquals(Collections.singletonList(
            new NumberElement("10\u201312", CSLLabel.CHAPTER, true)),
            NumberParser.parse("chapters 10-12"));
    assertEquals(Collections.singletonList(
            new NumberElement("10\u201312", CSLLabel.SECTION, true)),
            NumberParser.parse("sections 10-12"));
    assertEquals(Collections.singletonList(
            new NumberElement("10, 4", CSLLabel.CHAPTER, true)),
            NumberParser.parse("ch. 10, 4"));
    assertEquals(Collections.singletonList(
            new NumberElement("10\u201312", null, true)),
            NumberParser.parse("10-12"));
    assertEquals(Collections.singletonList(
            new NumberElement("10, 12", null, true)),
            NumberParser.parse("10,12"));
    assertEquals(Collections.singletonList(
            new NumberElement("10, 12", null, true)),
            NumberParser.parse("10,12"));
    assertEquals(Collections.singletonList(
            new NumberElement("10 & 12", null, true)),
            NumberParser.parse("10 & 12"));
    assertEquals(Collections.singletonList(
            new NumberElement("10 & 12", null, true)),
            NumberParser.parse("10&12"));
    assertEquals(Collections.singletonList(
            new NumberElement("10 and 12", null, true)),
            NumberParser.parse("10 and 12"));
    assertEquals(Collections.singletonList(
            new NumberElement("2\u20133", CSLLabel.CHAPTER, true)),
            NumberParser.parse("ch. 2-3"));
    assertEquals(Collections.singletonList(
            new NumberElement("1, 2, 3", CSLLabel.CHAPTER, true)),
            NumberParser.parse("ch. 1,2,3"));
    assertEquals(Collections.singletonList(
            new NumberElement("1, 2, and 3", CSLLabel.CHAPTER, true)),
            NumberParser.parse("ch. 1,2, and 3"));
    assertEquals(Collections.singletonList(
            new NumberElement("1, 2, and 3", CSLLabel.CHAPTER, true)),
            NumberParser.parse("ch. 1,2, and 3,"));
}