@Test(groups = "unit")
public class Multimaps2Test {
public void testTransformKeysToLowerCase() {
Multimap<String, String> map = ImmutableMultimap.of("oNe", "1", "TWO", "2", "three", "3", "Three", "3.0");
Multimap<String, String> expected = ImmutableMultimap.of("one", "1", "two", "2", "three", "3", "three", "3.0");
Multimap<String, String> transformed = Multimaps2.transformKeys(map, new ToLowerCase());
assertEquals(transformed, expected);
}