How to test Miscellaneous Functions

Hello All

 I am trying to test the following function, But I dont know how to test
these functions. Please help me how to test these functions, and also give
some examples....

1.  pg_get_viewdef
2.  pg_get_ruledef
3.  pg_get_indexdef
4.  pg_get_userbyid

5.  obj_description

thanks in advance
--mathan


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