Test::Assertions provides a convenient set of tools for constructing tests,
such as unit tests or run-time assertion checks (like C's ASSERT macro).
Unlike some of the Test:: modules available on CPAN, Test::Assertions is
not limited to unit test scripts; for example it can be used to check
output is as expected within a benchmarking script. When it is used for
unit tests, it generates output in the standard form for CPAN unit testing
(under Test::Harness).

The package's import method is used to control the behaviour of ASSERT:
whether it dies, warns, prints 'ok'/'not ok', or does nothing.

In 'test' mode the script also exports plan(), only() and ignore()
functions. In 'test/ok' mode an ok() function is also exported for
compatibility with Test/Test::Harness. The plan function attempts to count
the number of tests if it isn't told a number (this works fine in simple
test scripts but not in loops/subroutines). In either mode, a warning will
be emitted if the planned number of tests is not the same as the number of
tests actually run, e.g.