Fix test to cater for packages leaked into venv

Author: pfmoore

tests/functional/test_python_option.py

@@ -11,12 +11,17 @@ def test_python_interpreter(
     tmpdir: Path,
     shared_data: TestData,
 ) -> None:
-    env_path = os.fsdecode(tmpdir / "venv")
+    env_path = os.fspath(tmpdir / "venv")
     env = EnvBuilder(with_pip=False)
     env.create(env_path)
 
     result = script.pip("--python", env_path, "list", "--format=json")
-    assert json.loads(result.stdout) == []
+    before = json.loads(result.stdout)
+
+    # Ideally we would assert that before==[], but there's a problem in CI
+    # that means this isn't true. See https://github.com/pypa/pip/pull/11326
+    # for details.
+
     script.pip(
         "--python",
         env_path,
@@ -26,8 +31,11 @@ def test_python_interpreter(
         "--no-index",
         "simplewheel==1.0",
     )
+
     result = script.pip("--python", env_path, "list", "--format=json")
-    assert json.loads(result.stdout) == [{"name": "simplewheel", "version": "1.0"}]
+    installed = json.loads(result.stdout)
+    assert {"name": "simplewheel", "version": "1.0"} in installed
+
     script.pip("--python", env_path, "uninstall", "simplewheel", "--yes")
     result = script.pip("--python", env_path, "list", "--format=json")
-    assert json.loads(result.stdout) == []
+    assert json.loads(result.stdout) == before