/testcache

Caching for unit tests in R

Primary LanguageR

Method

testcache::test_that() is a drop-in replacement for testthat::test_that():

  • The first time a test with caching gets run, it creates a file in tests/testthat/_cache/ to indicate which functions get called, directly or indirectly, during the test. It also saves some information about the test itself, such as the description, code used and results.

  • When the test is called subsequently, if it hasn’t changed it doesn’t get run - instead, it is simulated so the results are still shown. A test is considered to have not changed if the code argument to test_that() is the same, and none of the functions which are directly or indirectly called by the test have changed.

  • Information about caching is displayed in the normal testthat messaging by use of a custom reporter CacheReporter, which is set as the default reporter using the global option testthat.default_reporter