### Question:
DataObjectPropertyName implements PropertyType { @Override public int hashCode() { return HashUtil.combineHashCodes(NAME.hashCode()); }  @Override String getName(); @Override boolean equals(Object o); @Override int hashCode(); @Override String toString(); static final String NAME; }### Answer:
@Test public void testHashCode() { assertEquals(new DataObjectPropertyName().hashCode(), dataObjectPropertyName.hashCode()); }