@SafeVarargs
    public static <T> Set<T> createSetContaining(T... contents) {
        return new HashSet<>(Arrays.asList(contents));
    }
@Test
    public void testCreateSetContaining() {
        Set<String> set = CollectionHelper.createSetContaining("foo", "bar", "baz");
        assertEquals(3, set.size());
        assertTrue(set.contains("foo"));
        assertTrue(set.contains("bar"));
        assertTrue(set.contains("baz"));
    }