old_contents: import json
  import os
  from pathlib import Path
  from venv import EnvBuilder
  
  from tests.lib import PipTestEnvironment, TestData
  
  
  def test_python_interpreter(
      script: PipTestEnvironment,
      tmpdir: Path,
      shared_data: TestData,
  ) -> None:
      env_path = os.fsdecode(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) == []
      script.pip(
          "--python",
          env_path,
          "install",
          "-f",
          shared_data.find_links,
          "--no-index",
          "simplewheel==1.0",
      )
      result = script.pip("--python", env_path, "list", "--format=json")
      assert json.loads(result.stdout) == [{"name": "simplewheel", "version": "1.0"}]
      script.pip("--python", env_path, "uninstall", "simplewheel", "--yes")
      result = script.pip("--python", env_path, "list", "--format=json")
      assert json.loads(result.stdout) == []
  
new_contents: import json
  import os
  from pathlib import Path
  from venv import EnvBuilder
  
  from tests.lib import PipTestEnvironment, TestData
  
  
  def test_python_interpreter(
      script: PipTestEnvironment,
      tmpdir: Path,
      shared_data: TestData,
  ) -> None:
      env_path = os.fspath(tmpdir / "venv")
      env = EnvBuilder(with_pip=False)
      env.create(env_path)
  
      result = script.pip("--python", env_path, "list", "--format=json")
      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,
          "install",
          "-f",
          shared_data.find_links,
          "--no-index",
          "simplewheel==1.0",
      )
  
      result = script.pip("--python", env_path, "list", "--format=json")
      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) == before
  
subject: Fix test to cater for packages leaked into venv