@Test
public void testConcat_List() {

    Collection<Series<String>> ss = asList(
            Series.forData("m", "n"),
            Series.forData("a", "b"),
            Series.forData("d"));
    Series<String> c = SeriesConcat.concat(ss);
    new SeriesAsserts(c).expectData("m", "n", "a", "b", "d");
}