### Question:
CommonNerTokenTransformers { public static TokenTransformer getLowerCaseTransformer() { return ToLowerCaseTransformer; }  static TokenTransformer getLowerCaseTransformer(); static TokenTransformer getMorphologyUpperLowerNumberTransformer(); static TokenTransformer getMorphologyUpperLowerNumberNonContiguousTransformer(); static TokenTransformer getMorphologyContiguousNumbersGroupedOrRejectedTransformer(); static TokenTransformer getEnglishVowelsTransformer();  }### Answer:
@Test public void testLowerCaseTransformer() { TokenTransformer transformer = CommonNerTokenTransformers.getLowerCaseTransformer(); assertEquals("", transformer.transform("")); assertEquals("miau", transformer.transform("miau")); assertEquals("miau", transformer.transform("MIAU")); assertEquals("a", transformer.transform("A")); assertEquals("aaaaa", transformer.transform("AaAaa")); assertEquals("aa", transformer.transform("aA")); }