Method _assert_cwd

Lib/test/test_subprocess.py:431–448

(self, expected_cwd, python_arg, **kwargs)

    # For use in the test_cwd* tests below.
    def _assert_cwd(self, expected_cwd, python_arg, **kwargs):
        # Invoke Python via Popen, and assert that (1) the call succeeds,
        # and that (2) the current working directory of the child process
        # matches *expected_cwd*.
        p = subprocess.Popen([python_arg, "-c",
                              "import os, sys; "
                              "buf = sys.stdout.buffer; "
                              "buf.write(os.getcwd().encode()); "
                              "buf.flush(); "
                              "sys.exit(47)"],
                              stdout=subprocess.PIPE,
                              **kwargs)
        self.addCleanup(p.stdout.close)
        p.wait()
        self.assertEqual(47, p.returncode)
        normcase = os.path.normcase
        self.assertEqual(normcase(expected_cwd),
                         normcase(p.stdout.read().decode()))

    def test_cwd(self):
        # Check that cwd changes the cwd for the child process.