Method assert_isolation

tests/test_pex.py:360–392

(self, inherit_path, expected_output)

    exe = attr.ib()  # type: str

    def assert_isolation(self, inherit_path, expected_output):
        # type: (Union[str, bool], str) -> None
        env = dict(PYTHONPATH=self.pythonpath)
        with temporary_dir() as temp_dir:
            pex_builder = write_simple_pex(
                temp_dir,
                pex_info=self.pex_info(inherit_path),
                dists=self.dists,
                exe_contents=self.exe,
            )

            interpreter = PythonInterpreter.get()
            if PY2:
                # Under Python 2 venvs (created by Pex via Virtualenv 16.7.12), the venv interpreter
                # can fail to resolve stdlib weakref internals. We side-step by just resolving out
                # of the venv since this test is aimed squarely at PYTHONPATH isolation.
                interpreter = interpreter.resolve_base_interpreter()

            # Test the PEX.run API.
            process = PEX(pex_builder.path(), interpreter=interpreter).run(
                stdout=subprocess.PIPE,
                stderr=subprocess.PIPE,
                env=env,
                blocking=False,
            )
            stdout, stderr = process.communicate()
            assert process.returncode == 0, stderr.decode("utf-8")
            assert expected_output == stdout.decode("utf-8")

            # Test direct PEX execution.
            assert expected_output == subprocess.check_output(
                [interpreter.binary, pex_builder.path()], env=env
            ).decode("utf-8")


@pytest.fixture(scope="module")