Redone tests

./codecov is a stalled version for code coverage. It will be merged with main when the library is done with breaking changes

tests/codecov/README.md

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+# codecov
+
+In order to provide a good code coverage, all macros have been expanded and added to `src/*.c`.
+
+* `src` - Since gcov fails to detect code that was expanded by macro, all collections where manually expanded and dumped into their respective source files;
+* `unt` - Unit Tests;
+* `main.c` - Where all tests are compiled together and called by main().