Provides a lightweight (zero-dependency) and easy to use unit testing
framework. Main features: install tests with the package. Test results
are treated as data that can be stored and manipulated. Test files are
R scripts interspersed with test commands, that can be programmed
over. Fully automated build-install-test sequence for packages. Skip
tests when not run locally (e.g. on CRAN). Flexible and configurable
output printing. Compare computed output with output stored with the
package. Run tests in parallel. Extensible by other packages. Report
side effects.
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