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
the package name
the directory of the test files; by default, it is the directory ‘testit/’ under the current working directory
The tests are assumed to be under the ‘testit/’ directory by default,
and 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
source() them in tests).
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.
NULL. All test files are executed, unless an error occurs.
All test scripts (test-*.R) must be encoded in UTF-8 if they contain any multibyte characters.
The testthat package (much more sophisticated).
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## Not run: test_pkg("testit") ## End(Not run)
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