• is_testing() determine if code is being run as part of a test

• is_parallel() if the test is being run in parallel.

• testing_package() gives name of the package being tested.

These are thin wrappers that retrieve the values of environment variables. To avoid creating a run-time dependency on testthat, you can inline the source of these functions directly into your package.

is_testing()

is_parallel()

testing_package()