TAP 14 allows an optional test plan to be emitted before the start of
the start of testing[1]; this is valuable because it makes it possible
for a test harness to detect whether the number of tests run matches the
number of tests expected to be run, ensuring that no tests silently
failed.

Link[1]: https://github.com/isaacs/testanything.github.io/blob/tap14/tap-version-14-specification.md#the-planSigned-off-by: NBrendan Higgins <brendanhiggins@google.com>
Reviewed-by: NStephen Boyd <sboyd@kernel.org>
Signed-off-by: NShuah Khan <skhan@linuxfoundation.org>