Write test cases to observe server behavior on "Undefined" search filter items

RFC 4511, Section "4.5.1.7. SearchRequest.filter", tells about handling Undefined cases in search filters. We need to have extensive test cases where we test complex filters with Undefined items. Some of the combinations we need to test are as follows:

• &((x=y)(m=n)) where there is no x and (m=n) is true.

• ((x=y)(m=n)) where there is no x and (m=n) is false. ...