Source a file, directory of files, or various important subsets

These are used by test_dir() and friends

source_file(path, env = test_env(), chdir = TRUE,
  encoding = "unknown", wrap = TRUE)

source_dir(path, pattern = "\\.[rR]$", env = test_env(),
  chdir = TRUE, wrap = TRUE)

source_test_helpers(path = "tests/testthat", env = test_env())

source_test_setup(path = "tests/testthat", env = test_env())

source_test_teardown(path = "tests/testthat", env = test_env())

Arguments

path	Path to files.
env	Environment in which to evaluate code.
chdir	Change working directory to dirname(path)?
encoding	Deprecated.
wrap	Automatically wrap all code within test_that()? This ensures that all expectations are reported, even if outside a test block.
pattern	Regular expression used to filter files.

Test files

For package code, tests should live in tests/testthat.

There are four classes of .R files that have special behaviour:

• Test files start with test and are executed in alphabetical order.

• Helper files start with helper and are executed before tests are run and from devtools::load_all().

• Setup files start with setup and are executed before tests, but not during devtools::load_all().

• Teardown files start with teardown and are executed after the tests are run.