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, ...)

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(), ...)

`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"`.
`...`	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).