@Test
 public void setAndClearAnnotations() {
   data.set("croc", "aqua");
   data.set("roo", "mars");
   data.set("dingo", "bat");
   assertEquals("incorrect property", "bat", data.value("dingo"));
   data.clear("dingo", "roo");
   assertNull("incorrect property", data.value("dingo"));
   assertNull("incorrect property", data.value("root"));
   assertEquals("incorrect property", "aqua", data.value("croc"));
   assertEquals("incorrect properties", 1, data.keys().size());
 }