Unittest redesign

[ledvinap]

Build printf using C Convert most tests in test_suite to use macro Fix catch2

New tests use CHECK now, but it may be reverted easily back to REQUIRE.

[codecov-io]

Codecov Report

Merging #58 into master will not change coverage. The diff coverage is 100%.

@@          Coverage Diff          @@
##           master    #58   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           1      1           
  Lines         359    355    -4     
=====================================
- Hits          359    355    -4

Impacted Files	Coverage Δ
printf.c	100% <100%> (ø)	:arrow_up:

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[ledvinap]

Hello. Is there anything I can do ?

The coverage report is strange - missing line is always-false branch dependent on type size (sizeof(uintptr_t) == sizeof(long long);), it shouldn't be covered even before this change, but c++ is probably optimizing a bit even with -O0

[eyalroz]

@ledvinap : So, some of these changes aren't strictly about the unit tests, and are covered by other PRs. Also, if you check out my fork, you'll notice I've merged some of those proposed changes, as this repo has not seen much traction for a while. If you're interested - I would appreciate PR against that fork.