Incorrect include of boost unit test in global_fixture.hpp

[kleunen]

The header file 'global_fixture.hpp' was including the wrong boost unit test header file, causing a compilation error on windows.
http:https://boost.2283326.n4.nabble.com/Boost-unit-test-cpp-problem-when-try-to-compile-simple-program-td2596687.html

You need different include than. Can't have it both ways. Either you include
library implementation or you link with it.

Use boost/test/unit_test.hpp

[codecov]

Codecov Report

Merging #721 (6f0c7b3) into master (3234099) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #721   +/-   ##
=======================================
  Coverage   82.06%   82.06%           
=======================================
  Files          47       47           
  Lines        7082     7082           
=======================================
  Hits         5812     5812           
  Misses       1270     1270           

[redboltz]

Some of azure build pipelines are failed.
I re-run failed build but got the same result.

It seems that the error is caused by actions/runner-images#1847
I guess that some of your builds just across vm image update.
It seems that you need to update the boost version.

[kleunen]

It seems that you need to update the boost version.

It took me a moment, to understand what you were saying

[redboltz]

Thank you for updating!
Your fix works perfectly.