Address errors in tests for Windows

setuptools/build_meta.py

@@ -290,18 +290,18 @@ def _arbitrary_args(self, config_settings: _ConfigSettings) -> Iterator[str]:
         """
         args = self._get_config("--global-option", config_settings)
         global_opts = self._valid_global_options()
-        warn = []
+        bad_args = []
 
         for arg in args:
             if arg.strip("-") not in global_opts:
-                warn.append(arg)
+                bad_args.append(arg)
                 yield arg
 
         yield from self._get_config("--build-option", config_settings)
 
-        if warn:
+        if bad_args:
             msg = f"""
-            The arguments {warn!r} were given via `--global-option`.
+            The arguments {bad_args!r} were given via `--global-option`.
             Please use `--build-option` instead,
             `--global-option` is reserved to flags like `--verbose` or `--quiet`.
             """

setuptools/tests/test_build_meta.py

@@ -12,7 +12,6 @@
 
 import pytest
 from jaraco import path
-from setuptools._deprecation_warning import SetuptoolsDeprecationWarning
 
 from .textwrap import DALS
 
@@ -624,23 +623,31 @@ def test_build_sdist_relative_path_import(self, tmpdir_cwd):
         }
     }
 
-    # For some reason `pytest.warns` does no seem to work here
-    # but `pytest.raises` does works (in systems other then macOS),
-    # together with an error filter.
-    @pytest.mark.xfail(
-        sys.platform == "darwin",
-        reason="inconsistent behaviour in macOS"
-    )
-    @pytest.mark.filterwarnings("error::setuptools.SetuptoolsDeprecationWarning")
-    def test_editable_with_config_settings_warning(self, tmpdir_cwd):
+    def _assert_link_tree(self, parent_dir):
+        """All files in the directory should be either links or hard links"""
+        files = list(Path(parent_dir).glob("**/*"))
+        assert files  # Should not be empty
+        for file in files:
+            assert file.is_symlink() or os.stat(file).st_nlink > 0
+
+    @pytest.mark.filterwarnings("ignore::setuptools.SetuptoolsDeprecationWarning")
+    # Since the backend is running via a process pool, in some operating systems
+    # we may have problems to make assertions based on warnings/stdout/stderr...
+    # So the best is to ignore them for the time being.
+    def test_editable_with_global_option_still_works(self, tmpdir_cwd):
+        """The usage of --global-option is now discouraged in favour of --build-option.
+        This is required to make more sense of the provided scape hatch and align with
+        previous pip behaviour. See pypa/setuptools#1928.
+        """
         path.build({**self._simple_pyproject_example, '_meta': {}})
         build_backend = self.get_build_backend()
+        assert not Path("build").exists()
+
+        cfg = {"--global-option": "--strict"}
+        build_backend.prepare_metadata_for_build_editable("_meta", cfg)
+        build_backend.build_editable("temp", cfg, "_meta")
 
-        msg = "The arguments .'--strict'. were given via .--global-option."
-        with pytest.raises(SetuptoolsDeprecationWarning, match=msg):
-            cfg = {"--global-option": "--strict"}
-            build_backend.prepare_metadata_for_build_editable("_meta", cfg)
-            build_backend.build_editable("temp", cfg, "_meta")
+        self._assert_link_tree(next(Path("build").glob("__editable__.*")))
 
     def test_editable_without_config_settings(self, tmpdir_cwd):
         """
@@ -668,11 +675,7 @@ def test_editable_with_config_settings(self, tmpdir_cwd, config_settings):
         build_backend = self.get_build_backend()
         build_backend.prepare_metadata_for_build_editable("_meta", config_settings)
         build_backend.build_editable("temp", config_settings, "_meta")
-        files = list(Path("build").glob("__editable__.*/**/*"))
-        assert files
-        for file in files:
-            # All files should either links or hard links
-            assert file.is_symlink() or os.stat(file).st_nlink > 0
+        self._assert_link_tree(next(Path("build").glob("__editable__.*")))
 
     @pytest.mark.parametrize('setup_literal, requirements', [
         ("'foo'", ['foo']),