@Theory
    public void isEmpty(int size) {
        CaseInsensitiveStringMultiMap actual = new CaseInsensitiveStringMultiMap(size);
        actual.add("x", "y").add("x", "z");
        actual.remove("x");
        Assert.assertTrue(actual.isEmpty());
    }
@author Marc Savy {@literal <msavy@redhat.com>}
gateway/engine/beans/src/test/java/io/apiman/gateway/engine/beans/util/CaseInsensitiveStringMultiMapTest.java