It appears that the specify parameters window is blank for packaged functions which means the test call fails when run. Is this a grant or synonym issue ( or something similar ) or is there an issue with testing packages via the unit test interface of sql developer. Thanks in advance.
Seems that you cannot right click on the packaged schema object from the schema connection i.e. you have to create the test from the unit test tab and then choose the object type i.e select packages and then the packaged function or procedure. This method results in the Specify Parameters window having the correct signature displayed. Procedures or methods can be created via the unit test tab or the active connection tab.