def test_extend_path(self, additional_paths):
env = os.environ.copy()
_extend_python_path(env, additional_paths)
assert env["PYTHONPATH"] == os.pathsep.join(additional_paths)
def test_extend_path_existing_pythonpath(self):
"""When PYTHONPATH exists, extending it preserves the existing values."""
env = {"PYTHONPATH": "hello"}
_extend_python_path(env, ["test", ".pth"])
assert env["PYTHONPATH"] == os.pathsep.join(["hello", "test", ".pth"])