remove tests that may cause error inunprepared environments

Author: Tomoaki Nishiyama

RPostgreSQL/ChangeLog

@@ -1,3 +1,6 @@
+2024-09-30  Tomoaki NISHIYAMA <tomoaki@sci.u-toyama.ac.jp>
+        * Simplify tests
+
 2024-09-24  Tomoaki NISHIYAMA <tomoaki@sci.u-toyama.ac.jp>
         * Update DESCRIPTION
 

RPostgreSQL/DESCRIPTION

@@ -1,6 +1,6 @@
 Package: RPostgreSQL
 Version: 0.7-7
-Date: 2024-09-22
+Date: 2024-09-30
 Title: R Interface to the 'PostgreSQL' Database System
 Maintainer: Tomoaki Nishiyama <tomoaki@sci.u-toyama.ac.jp>
 Description: Database interface and 'PostgreSQL' driver for 'R'.