The main purpose of this function is to expose the namespace of a package
when running tests, which allows one to use non-exported objects in the
package without having to resort to the triple colon ::: trick.
test_pkg(package, dir = c("testit", "tests/testit"))the package name
the directory of the test files; by default, it is the directory
testit/ or tests/testit/ under the current working directory
NULL. All test files are executed, unless an error occurs.
The tests are assumed to be under the testit/ or tests/testit/
directory by default (depending on your working directory is the package root
directory or the tests/ directory). This function also looks for the
tests/testit/ directory under the package installation directory when
the user-provided dir does not exist. The test scripts must be named
of the form test-*.R; other R scripts will not be treated as test
files (but may also be useful, e.g. you can source() them in
tests).
For R CMD check, this means the test R scripts (test-*.R are
under pkg_root/tests/testit/. The R scripts are executed with
sys.source in the namespace of the package to be tested; when
an R script is executed, the working directory is the same as the directory
containing this script, and all existing objects in the test environment will
be removed before the code is executed.
The testthat package (much more sophisticated).
# NOT RUN {
test_pkg("testit")
# }
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