@Test
public void testSplitMixedCaseWord_happyPath_allValidWords() {

    List<String> actual = SpellChecker.splitMixedCaseWord("camelCaseWord");
    Assert.assertEquals(3, actual.size());
    Assert.assertEquals("camel", actual.get(0));
    Assert.assertEquals("Case", actual.get(1));
    Assert.assertEquals("Word", actual.get(2));
}