svoid test_HashedByteArray() {
  HashedByteArray a = new(toUtf8("hello"));
  HashedByteArray b = new(toUtf8("hello"));
  HashedByteArray c = new(toUtf8("bello"));
  
  assertEqualsVerbose(a, b);
  assertEqualsVerbose(a, b);
  assertEqualsVerbose(a.hashCode(), b.hashCode());
  assertFalse(a.equals(c));
}