get_test_coverage       Get Test Coverage of Package
open_testfile           Open associated test_file
test_skeleton           Create a test skeleton file for the currently
                        open .R file
test_subdir             Run tests in subdirectories
test_this               Test this file
test_with_skip          Execute all test_that tests in a package,
                        except some.
testthis                Testthis-package
use_test_subdir         Use test subdirectories
use_testdata            Create 'testdata' folder.
use_testdata_raw        Create 'testdata-raw' folder.
use_tester              Use a tester function
use_testignore          Tell testthis that a function does not need to
                        be tested
