import('python').find_installation('python').version() causes exception
because of a missing initialization, when `find_installation()` receives
a name or a path.
It can only be used for projects that don't have any rules at all, i.e.
they are purely using Meson to:
- configure files
- run (script?) tests
- install files that exist by the end of the setup stage
This can be useful e.g. for Meson itself, a pure python project.
In a couple of python module tests, we try to test things that rely on
the default python being the same one we look up in the python module.
This is unsolvable for the deprecated python3 module, as it actually
uses the in-process version of python for everything. For the python
module, we could actually look up the default system python instead of
the one we are running with, but then we wouldn't be testing the
functionality of that alternative python... and also the install
manifest tests would see files installed for the wrong version of
python, and report a combination of missing+extra files...
Solve both tests by just skipping the parts we cannot check.
Apparently Azure provides 64-bit python2 when we try to test 32-bit, and
that breaks everything on the 32-bit test runner.
I don't understand the environment setup, and that runner is
disappearing soon anyway. Hopefully this shuts up the known breakage.
Perhaps when this test case was originally created, project tests could
not use a matrix of options? This is certainly possible today, so don't
write special unittest handling for this instead.
This adds proper visibility into what gets run and what doesn't. Now we
know which python executables got tested and which got skipped.
This mirrors the modules keyword argument that some dependencies (such
as qt and llvm) take. This allows an easier method to determine if
modules are installed.
This doesn't touch everything as it's just based on the python3 module
tests, ported to the python module. It's still better than the one very
basic test in the unit test module.
Charles Brunet