// Test an empty AT
entry.put( "commonName", atCN, (String)null );
assertEquals( 1, entry.size() );
assertEquals( "commonName", entry.get( atCN ).getUpId() );
assertTrue( entry.containsAttribute( "cn" ) );
assertNull( entry.get( atCN ).get().get() );
// Check that we can use a null AttributeType
entry.put( "commonName", (AttributeType)null, (String)null );
assertEquals( 1, entry.size() );