TST: enable tests using venv unconditionally

Issues with venv setup have been solved on all platforms.

Signed-off-by: Filipe Laíns <[email protected]>

Author: dnicolodi

tests/conftest.py

@@ -4,7 +4,6 @@
 import os
 import os.path
 import pathlib
-import platform
 import shutil
 import tempfile
 
@@ -83,12 +82,6 @@ def venv():
         shutil.rmtree(path)
 
 
-# On Linux and macOS the venv creation fails when pip is installed in the newly created environment:
-# subprocess.check_output(['{venv}/bin/python',  '-Im', 'ensurepip', '--upgrade', '--default-pip'], ...)
-# fails with "ModuleNotFoundError: No module named 'encodings'"
-venv_supported = platform.python_implementation() != 'PyPy' or platform.system() not in {'Linux', 'Darwin'}
-
-
 def generate_package_fixture(package):
     @pytest.fixture
     def fixture():

tests/docs/examples/test_spam.py

@@ -5,11 +5,9 @@
 
 import mesonpy
 
-from ...conftest import venv_supported
 from .conftest import build_project_wheel, examples_dir
 
 
-@pytest.mark.skipif(not venv_supported, reason='Cannot setup venv')
 def test_build_and_import(venv, tmp_dir_session):
     """Test that the wheel for the spam example builds, installs, and imports."""
 

tests/test_wheel.py

@@ -13,8 +13,6 @@
 
 import mesonpy._elf
 
-from .conftest import venv_supported
-
 
 EXT_SUFFIX = sysconfig.get_config_var('EXT_SUFFIX')
 INTERPRETER_VERSION = f'{sys.version_info[0]}{sys.version_info[1]}'
@@ -171,7 +169,6 @@ def test_configure_data(wheel_configure_data):
     }
 
 
-@pytest.mark.skipif(not venv_supported, reason='Cannot setup venv')
 @pytest.mark.skipif(platform.system() != 'Linux', reason='Unsupported on this platform for now')
 def test_local_lib(venv, wheel_link_against_local_lib):
     subprocess.check_call([