This is a very simple testing framework for writing and running tests
for C++. The basic idea is that a `struct unit_test` is defined for
every test function to run, and then the test framework simply runs them
one at a time, printing various information about the tests out as ti
goes.
There are also various 'test_assert*()` macros to assert the value of
things while running the tests. They verify a value is equal to an
expected value, and if not it fails the tests. The more specific
assertions like the `ints` and `buffers` ones also print out useful
information on what the expected and actual values were, to aide in
debugging.
This is a fairly flexable build framework for building C++ test
executables. The executables are defined in a list and each can be given
its own set of source files, compiler flags, linker flags, etc. The
test source files are compiled together at the same time to allow any
necessary files to get applied at compile time.
Later a script will run through the test executables.
