This is run automatically by
test_that() but you may want to run it
yourself if you want to replicate test results interactively. If
run inside a function, the effects are automatically reversed when the
function exits; if running in the global environment, use
withr::deferred_run() to undo.
It sets the following options with
cli.unicode = FALSE so that the cli package never generates unicode
output (normally cli uses unicode on Linux/Mac but not Windows).
crayon.enabled = FALSE suppresses ANSI colours generated by the crayon
package (normally colours are used if crayon detects that you're in a
terminal that supports colour).
lifecycle_verbosity = "warning" so that every lifecycle problem always
generates a warning (otherwise deprecated functions don't generate a
warning every time).
OutDec = "." so numbers always uses
. as the decimal point
(European users sometimes set
OutDec = ",".)
rlang_interactive = FALSE so that
FALSE, and code that uses it assumes you're in a non-interactive
useFancyQuotes = FALSE so base R functions always use regular (straight)
quotes (otherwise the default is locale dependent, see
width = 80 to control the width of printed output (usually this
varies with the size of your console).
It also sets envvars
RSTUDIO = 0 (which ensures that RStudio is never
detected as running), and
TESTTHAT = "true" (which ensures that
TRUE), and sets collation locale to "C"
(which ensures that character sorting the same regardless of current
local_test_context(.env = parent.frame())
Environment to use for scoping; expert use only.