The test suite distributed with PostgreSQL
The postgresql-test package contains files needed for various tests for the PostgreSQL database management system, including regression tests and benchmarks.
acquired package info from repodata DB: repodata/9fa7a97b004e6cd27df42fe8fada322769689e7d75b9392144123908e6bfdc23-primary.sqlite.bz2
The programs needed to create and run a PostgreSQL server
PostgreSQL is an advanced Object-Relational database management system (DBMS). The postgresql-server package contains the programs needed to create and run a PostgreSQL server, which will in turn allow you to create and maintain PostgreSQL databases.
PostgreSQL development header files and libraries
The postgresql-server-devel package contains the header files and configuration needed to compile PostgreSQL server extension.
Extension modules distributed with PostgreSQL
The postgresql-contrib package contains various extension modules that are included in the PostgreSQL distribution.