@Test
@DependsOnMethod("testSet")
public void testSetNull() {
final DefaultCitation instance = new DefaultCitation("Some title");
final PropertyAccessor accessor = createPropertyAccessor();
final InternationalString title = instance.getTitle();
final int index = accessor.indexOf("title", true);
assertEquals("Some title", title.toString()); // Sanity check before to continue.
assertNull("title", accessor.set(index, instance, null, RETURN_NULL));
assertNull("title", instance.getTitle());
instance.setTitle(title);
assertSame("title", title, accessor.set(index, instance, null, RETURN_PREVIOUS));