R Under development (unstable) (2024-01-07 r85787 ucrt) -- "Unsuffered Consequences"
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> 
> ## First rough version of a test script
> ##
> ## Assumes that
> ##  a) PostgreSQL is running, and
> ##  b) the current user can connect
> ## both of which are not viable for release but suitable while we test
> ##
> ## Dirk Eddelbuettel, 02 Jul 2008
> ##                    21 Oct 2008   make conditional on environment variables
> 
> ## only run this if this env.var is set correctly
> if (Sys.getenv("POSTGRES_USER") != "" & Sys.getenv("POSTGRES_HOST") != "" & Sys.getenv("POSTGRES_DATABASE") != "") {
+ 
+     ## try to load our module and abort if this fails
+     stopifnot(require(RPostgreSQL))
+ 
+     ## load the PostgresSQL driver
+     drv <- dbDriver("PostgreSQL")
+     ## can't print result as it contains process id which changes  print(summary(drv))
+ 
+     ## connect to the default db
+     con <- dbConnect(drv,
+                      user=Sys.getenv("POSTGRES_USER"),
+                      password=Sys.getenv("POSTGRES_PASSWD"),
+                      host=Sys.getenv("POSTGRES_HOST"),
+                      dbname=Sys.getenv("POSTGRES_DATABASE"),
+                      port=ifelse((p<-Sys.getenv("POSTGRES_PORT"))!="", p, 5432))
+ 
+     ## run a simple query and show the query result
+     res <- dbGetQuery(con, paste("select datname,encoding,datallowconn from pg_database",
+                                  "where datname like 'template%' order by datname"))
+     print(res)
+ 
+     ## and disconnect
+     dbDisconnect(con)
+ }
> 
> proc.time()
   user  system elapsed 
   0.15    0.03    0.17