teardown: Run code before/after tests

In testthat: Unit Testing for R

Run code before/after tests

Description

We no longer recommend using setup() and teardown(); instead we think it's better practice to use a test fixture as described in vignette("test-fixtures").

Code in a setup() block is run immediately in a clean environment. Code in a teardown() block is run upon completion of a test file, even if it exits with an error. Multiple calls to teardown() will be executed in the order they were created.

Usage

teardown(code, env = parent.frame())

setup(code, env = parent.frame())

Arguments

code	Code to evaluate
env	Environment in which code will be evaluated. For expert use only.

Examples

## Not run: 
# Old approach
tmp <- tempfile()
setup(writeLines("some test data", tmp))
teardown(unlink(tmp))

## End(Not run)

# Now recommended:
local_test_data <- function(env = parent.frame()) {
  tmp <- tempfile()
  writeLines("some test data", tmp)
  withr::defer(unlink(tmp), env)

  tmp
}
# Then call local_test_data() in your tests

testthat documentation built on April 4, 2025, 1:08 a.m.