Prior to this change, on failure condition, x52cli would exit with a
code that mapped directly to the return code of the function. This was
inconsistent with the behaviour if the initialization or connect steps
failed for any reason.
Prior to this change, the tests file contained every test that was in
the original script based test suite. However, we don't need to test
every single scenario within libx52, since those are already handled in
the libx52 specific tests. This also causes a slow compilation, since
the tests are written as a series of macros, and the result is a 2000+
line file before preprocessing.
This change removes some of the spurious test cases, and simply checks
that the parameters passed to the corresponding libx52 function are as
expected for a few test cases.