Ideally we'd just do this when we need it, but the ostream derivation
will be controlled by both global config and per-structure config, so
it's hard to know exactly when we need it and when we don't.
The tests are very straightforward, and effecitvely are just ensuring
that the formatting works correctly and is included in all of the
important cases.
It's also very important to ensure we do not generate laid-out structs
for layouts which we cannot reasonably represent in C (such as in cases
where we weren't told what annotation to use for packed and
specifically-aligned structures). Thus, add some tests to verify that
this is the case.
Signed-off-by: Aleksa Sarai <cyphar@cyphar.com>
Kartikaya Gupta
Aleksa Sarai