test: Execute 'test_that' tests in a package.
In devtools: Tools to Make Developing R Packages Easier

test() is a shortcut for testthat::test_dir(), it runs all of a package's tests. test_file runs test() on the active file. test_coverage() computes test coverage for your package. It is a shortcut for covr::package_coverage() and covr::report(). test_coverage_file() computes test coverage for the active file. Is a shortcut for covr::file_coverage() and covr::report().

test(pkg = ".", filter = NULL, stop_on_failure = FALSE, export_all = TRUE, ...)

test_coverage(pkg = ".", show_report = interactive(), ...)

uses_testthat(pkg = ".")

test_file(file = find_active_file(), ...)

test_coverage_file(
  file = find_active_file(),
  filter = TRUE,
  show_report = interactive(),
  export_all = TRUE,
  ...
)

`pkg`	The package to use, can be a file path to the package or a package object. See `as.package()` for more information.
`filter`	If not `NULL`, only tests with file names matching this regular expression will be executed. Matching be performed on the file name after it has been stripped of `"test-"` and `".R"`.
`stop_on_failure`	If `TRUE`, throw an error if any tests fail. For historical reasons, the default value of `stop_on_failure` is `TRUE` for `test_package()` and `test_check()` but `FALSE` for `test_dir()`, so if you're calling `test_dir()` you may want to consider explicitly setting `stop_on_failure = TRUE`.
`export_all`	If `TRUE` (the default), export all objects. If `FALSE`, export only the objects that are listed as exports in the NAMESPACE file.
`...`	additional arguments passed to `testthat::test_dir()` and `covr::package_coverage()`
`show_report`	Show the test coverage report.
`file`	One or more source or test files. If a source file the corresponding test file will be run. The default is to use the active file in RStudio (if available).