TST: enable --fatal-meson-warnings for all tests

Author: dnicolodi

tests/conftest.py

@@ -192,3 +192,18 @@ def cleanenv():
     # $MACOSX_DEPLOYMENT_TARGET affects the computation of the platform tag on macOS.
     yield mpatch.delenv('MACOSX_DEPLOYMENT_TARGET', raising=False)
     mpatch.undo()
+
+
+@pytest.fixture(autouse=True, scope='session')
+def meson_fatal_warnings():
+    # Cannot use the 'monkeypatch' fixture because of scope mismatch.
+    mpatch = pytest.MonkeyPatch()
+    mesonpy_project_init = mesonpy.Project.__init__
+
+    def __init__(self, source_dir, build_dir, meson_args=None, editable_verbose=False):
+        if meson_args is None:
+            meson_args = {}
+        meson_args['setup'] = meson_args.get('setup', []) + ['--fatal-meson-warnings']
+        mesonpy_project_init(self, source_dir, build_dir, meson_args, editable_verbose)
+
+    mpatch.setattr(mesonpy.Project, '__init__', __init__)

tests/test_project.py

@@ -400,7 +400,7 @@ def test_ios_project(package_simple, monkeypatch, multiarch, tmp_path):
     project = mesonpy.Project(source_dir=package_simple, build_dir=tmp_path)
 
     # Meson configuration points at the cross file
-    assert project._meson_args['setup'] == ['--cross-file', os.fspath(tmp_path / 'meson-python-cross-file.ini')]
+    assert project._meson_args['setup'][-2:] == ['--cross-file', os.fspath(tmp_path / 'meson-python-cross-file.ini')]
 
     # Meson config files exist, and have some relevant keys
     assert (tmp_path / 'meson-python-native-file.ini').exists()