message: add test with defaults
diff: -test_that("timezone_out works with UTC", {
  +test_that("timezone_out works with default", {
  + con <- dbConnect(duckdb())
  + on.exit(dbDisconnect(con, shutdown = TRUE))
  +
  + query <- "SELECT '1970-01-01 12:00:00'::TIMESTAMP AS ts"
  + res <- dbGetQuery(con, query)
  + expect_equal(res[[1]], as.POSIXct("1970-01-01 12:00:00", tz = "UTC"))
  +})
  +
  +test_that("timezone_out works with UTC specified", {
  con <- dbConnect(duckdb(), timezone_out = "UTC")
  on.exit(dbDisconnect(con, shutdown = TRUE))
  