Add support to recent googletest framework

[kelson42]

Fixes #829

The questions left (I see at this time) are:

• Should we update subproject/gtest
• Does that not impair compilation on older distributions (in particular focal)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (e3316a4) 57.57% compared to head (419b06f) 57.57%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #830   +/-   ##
=======================================
  Coverage   57.57%   57.57%           
=======================================
  Files          98       98           
  Lines        4545     4545           
  Branches     1911     1911           
=======================================
  Hits         2617     2617           
  Misses        668      668           
  Partials     1260     1260           

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[mgautierfr]

...TEST_CASE is deprecated since gtest 1.10.0 which was released in 2019.
We had 5 releases of gtest since (especially 1.13.0 for which we had to move to c++14/17).

Does that not impair compilaation on older distributions (in particular focat)

Focal has gtest 1.10.0 so we are good here.

Should we update subproject/gtest

Yes. (And also add a minimum version in meson.build)

[kelson42]

@mgautierfr Good, if OK for you, please just fix the last points and merge.

[kelson42]

@mgautierfr @legoktm Package libgtest-dev has version 1.8.1-3 on Debian Buster, see https://packages.debian.org/source/buster/googletest. But Buster Backports provides version 1.10.0 (which we need) see https://packages.debian.org/source/buster-backports/googletest. @legoktm There is no way you can also add the backport repository in the your Debian Buster Action?

[kelson42]

@mgautierfr Without feedback from @legoktm I propose to just comment-out or remove buster from the CI.

[legoktm]

Sorry for missing the ping earlier - let's just drop buster support entirely, it's no longer supported by Debian officially, just as part of Debian LTS.

[kelson42]

@mgautierfr I don't know why we have two linux CI failing because of libicu. Do you know? Can we merge?