local_test_context() 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.

local_reproducible_output() is run automatically by test_that() in the 3rd edition. You might want to call it to override the the default settings inside a test, if you want to test Unicode and coloured output or non-standard width.

local_test_context(.env = parent.frame())

local_reproducible_output(
  width = 80,
  crayon = FALSE,
  unicode = FALSE,
  .env = parent.frame()
)

Arguments

.env

Environment to use for scoping; expert use only.

width

Value of the "width" option.

crayon

Value of the "crayon.enabled" option.

unicode

Value of the "cli.unicode" option. The test is skipped if l10n_info()$`UTF-8` is FALSE.

Details

local_test_context() and local_reproducible_output() set the following options with withr::local_options():

  • cli.unicode (default: FALSE) so that the cli package never generates unicode output (normally cli uses unicode on Linux/Mac but not Windows). Windows can't easily save unicode output to disk, so it must be set to false for consistency.

  • crayon.enabled (default: 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).

  • width (default: 80) to control the width of printed output (usually this varies with the size of your console).

In addition, local_test_context() sets the following options:

  • cli.dynamic = FALSE so that tests assume that they are not run in a dynamic console (i.e. one where you can move the cursor around).

  • 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 rlang::is_interactive() returns FALSE, and code that uses it assumes you're in a non-interactive environment.

  • useFancyQuotes = FALSE so base R functions always use regular (straight) quotes (otherwise the default is locale dependent, see sQuote() for details).

local_test_context() also sets envvars RSTUDIO = 0 (which ensures that RStudio is never detected as running), and TESTTHAT = "true" (which ensures that is_testing() returns TRUE), and sets collation locale to "C" (which ensures that character sorting the same regardless of current locale).

Examples

local({ local_test_context() cat(crayon::blue("Text will not be colored")) cat(cli::symbol$ellipsis) cat("\n") })
#> Text will not be colored
ellipsis <- cli::symbol$ellipsis test_that("test ellipsis", { expect_equal(ellipsis, cli::symbol$ellipsis) local_reproducible_output(unicode = TRUE) expect_equal(ellipsis, cli::symbol$ellipsis) })
#> Test passed 😸