Removed the Requirement to Install Python and NodeJS (Now Bundled with Borealis)

Dependencies/Python/Lib/test/test_support.py

@@ -0,0 +1,800 @@
+import contextlib
+import errno
+import importlib
+import io
+import logging
+import os
+import shutil
+import socket
+import stat
+import subprocess
+import sys
+import sysconfig
+import tempfile
+import textwrap
+import unittest
+import warnings
+
+from test import support
+from test.support import import_helper
+from test.support import os_helper
+from test.support import script_helper
+from test.support import socket_helper
+from test.support import warnings_helper
+from test.support.testcase import ExtraAssertions
+
+TESTFN = os_helper.TESTFN
+
+
+class LogCaptureHandler(logging.StreamHandler):
+    # Inspired by pytest's caplog
+    def __init__(self):
+        super().__init__(io.StringIO())
+        self.records = []
+
+    def emit(self, record) -> None:
+        self.records.append(record)
+        super().emit(record)
+
+    def handleError(self, record):
+        raise
+
+
+@contextlib.contextmanager
+def _caplog():
+    handler = LogCaptureHandler()
+    root_logger = logging.getLogger()
+    root_logger.addHandler(handler)
+    try:
+        yield handler
+    finally:
+        root_logger.removeHandler(handler)
+
+
+class TestSupport(unittest.TestCase, ExtraAssertions):
+    @classmethod
+    def setUpClass(cls):
+        orig_filter_len = len(warnings.filters)
+        cls._warnings_helper_token = support.ignore_deprecations_from(
+            "test.support.warnings_helper", like=".*used in test_support.*"
+        )
+        cls._test_support_token = support.ignore_deprecations_from(
+            __name__, like=".*You should NOT be seeing this.*"
+        )
+        assert len(warnings.filters) == orig_filter_len + 2
+
+    @classmethod
+    def tearDownClass(cls):
+        orig_filter_len = len(warnings.filters)
+        support.clear_ignored_deprecations(
+            cls._warnings_helper_token,
+            cls._test_support_token,
+        )
+        assert len(warnings.filters) == orig_filter_len - 2
+
+    def test_ignored_deprecations_are_silent(self):
+        """Test support.ignore_deprecations_from() silences warnings"""
+        with warnings.catch_warnings(record=True) as warning_objs:
+            warnings_helper._warn_about_deprecation()
+            warnings.warn("You should NOT be seeing this.", DeprecationWarning)
+            messages = [str(w.message) for w in warning_objs]
+        self.assertEqual(len(messages), 0, messages)
+
+    def test_import_module(self):
+        import_helper.import_module("ftplib")
+        self.assertRaises(unittest.SkipTest,
+                          import_helper.import_module, "foo")
+
+    def test_import_fresh_module(self):
+        import_helper.import_fresh_module("ftplib")
+
+    def test_get_attribute(self):
+        self.assertEqual(support.get_attribute(self, "test_get_attribute"),
+                        self.test_get_attribute)
+        self.assertRaises(unittest.SkipTest, support.get_attribute, self, "foo")
+
+    @unittest.skip("failing buildbots")
+    def test_get_original_stdout(self):
+        self.assertEqual(support.get_original_stdout(), sys.stdout)
+
+    def test_unload(self):
+        import sched
+        self.assertIn("sched", sys.modules)
+        import_helper.unload("sched")
+        self.assertNotIn("sched", sys.modules)
+
+    def test_unlink(self):
+        with open(TESTFN, "w", encoding="utf-8") as f:
+            pass
+        os_helper.unlink(TESTFN)
+        self.assertFalse(os.path.exists(TESTFN))
+        os_helper.unlink(TESTFN)
+
+    def test_rmtree(self):
+        dirpath = os_helper.TESTFN + 'd'
+        subdirpath = os.path.join(dirpath, 'subdir')
+        os.mkdir(dirpath)
+        os.mkdir(subdirpath)
+        os_helper.rmtree(dirpath)
+        self.assertFalse(os.path.exists(dirpath))
+        with support.swap_attr(support, 'verbose', 0):
+            os_helper.rmtree(dirpath)
+
+        os.mkdir(dirpath)
+        os.mkdir(subdirpath)
+        os.chmod(dirpath, stat.S_IRUSR|stat.S_IXUSR)
+        with support.swap_attr(support, 'verbose', 0):
+            os_helper.rmtree(dirpath)
+        self.assertFalse(os.path.exists(dirpath))
+
+        os.mkdir(dirpath)
+        os.mkdir(subdirpath)
+        os.chmod(dirpath, 0)
+        with support.swap_attr(support, 'verbose', 0):
+            os_helper.rmtree(dirpath)
+        self.assertFalse(os.path.exists(dirpath))
+
+    def test_forget(self):
+        mod_filename = TESTFN + '.py'
+        with open(mod_filename, 'w', encoding="utf-8") as f:
+            print('foo = 1', file=f)
+        sys.path.insert(0, os.curdir)
+        importlib.invalidate_caches()
+        try:
+            mod = __import__(TESTFN)
+            self.assertIn(TESTFN, sys.modules)
+
+            import_helper.forget(TESTFN)
+            self.assertNotIn(TESTFN, sys.modules)
+        finally:
+            del sys.path[0]
+            os_helper.unlink(mod_filename)
+            os_helper.rmtree('__pycache__')
+
+    @support.requires_working_socket()
+    def test_HOST(self):
+        s = socket.create_server((socket_helper.HOST, 0))
+        s.close()
+
+    @support.requires_working_socket()
+    def test_find_unused_port(self):
+        port = socket_helper.find_unused_port()
+        s = socket.create_server((socket_helper.HOST, port))
+        s.close()
+
+    @support.requires_working_socket()
+    def test_bind_port(self):
+        s = socket.socket()
+        socket_helper.bind_port(s)
+        s.listen()
+        s.close()
+
+    # Tests for temp_dir()
+
+    def test_temp_dir(self):
+        """Test that temp_dir() creates and destroys its directory."""
+        parent_dir = tempfile.mkdtemp()
+        parent_dir = os.path.realpath(parent_dir)
+
+        try:
+            path = os.path.join(parent_dir, 'temp')
+            self.assertFalse(os.path.isdir(path))
+            with os_helper.temp_dir(path) as temp_path:
+                self.assertEqual(temp_path, path)
+                self.assertTrue(os.path.isdir(path))
+            self.assertFalse(os.path.isdir(path))
+        finally:
+            os_helper.rmtree(parent_dir)
+
+    def test_temp_dir__path_none(self):
+        """Test passing no path."""
+        with os_helper.temp_dir() as temp_path:
+            self.assertTrue(os.path.isdir(temp_path))
+        self.assertFalse(os.path.isdir(temp_path))
+
+    def test_temp_dir__existing_dir__quiet_default(self):
+        """Test passing a directory that already exists."""
+        def call_temp_dir(path):
+            with os_helper.temp_dir(path) as temp_path:
+                raise Exception("should not get here")
+
+        path = tempfile.mkdtemp()
+        path = os.path.realpath(path)
+        try:
+            self.assertTrue(os.path.isdir(path))
+            self.assertRaises(FileExistsError, call_temp_dir, path)
+            # Make sure temp_dir did not delete the original directory.
+            self.assertTrue(os.path.isdir(path))
+        finally:
+            shutil.rmtree(path)
+
+    def test_temp_dir__existing_dir__quiet_true(self):
+        """Test passing a directory that already exists with quiet=True."""
+        path = tempfile.mkdtemp()
+        path = os.path.realpath(path)
+
+        try:
+            with warnings_helper.check_warnings() as recorder, _caplog() as caplog:
+                with os_helper.temp_dir(path, quiet=True) as temp_path:
+                    self.assertEqual(path, temp_path)
+                warnings = [str(w.message) for w in recorder.warnings]
+            # Make sure temp_dir did not delete the original directory.
+            self.assertTrue(os.path.isdir(path))
+        finally:
+            shutil.rmtree(path)
+
+        self.assertListEqual(warnings, [])
+        self.assertEqual(len(caplog.records), 1)
+        record = caplog.records[0]
+        self.assertStartsWith(
+            record.getMessage(),
+            f'tests may fail, unable to create '
+            f'temporary directory {path!r}: '
+        )
+
+    @support.requires_fork()
+    def test_temp_dir__forked_child(self):
+        """Test that a forked child process does not remove the directory."""
+        # See bpo-30028 for details.
+        # Run the test as an external script, because it uses fork.
+        script_helper.assert_python_ok("-c", textwrap.dedent("""
+            import os
+            from test import support
+            from test.support import os_helper
+            with os_helper.temp_cwd() as temp_path:
+                pid = os.fork()
+                if pid != 0:
+                    # parent process
+
+                    # wait for the child to terminate
+                    support.wait_process(pid, exitcode=0)
+
+                    # Make sure that temp_path is still present. When the child
+                    # process leaves the 'temp_cwd'-context, the __exit__()-
+                    # method of the context must not remove the temporary
+                    # directory.
+                    if not os.path.isdir(temp_path):
+                        raise AssertionError("Child removed temp_path.")
+        """))
+
+    # Tests for change_cwd()
+
+    def test_change_cwd(self):
+        original_cwd = os.getcwd()
+
+        with os_helper.temp_dir() as temp_path:
+            with os_helper.change_cwd(temp_path) as new_cwd:
+                self.assertEqual(new_cwd, temp_path)
+                self.assertEqual(os.getcwd(), new_cwd)
+
+        self.assertEqual(os.getcwd(), original_cwd)
+
+    def test_change_cwd__non_existent_dir(self):
+        """Test passing a non-existent directory."""
+        original_cwd = os.getcwd()
+
+        def call_change_cwd(path):
+            with os_helper.change_cwd(path) as new_cwd:
+                raise Exception("should not get here")
+
+        with os_helper.temp_dir() as parent_dir:
+            non_existent_dir = os.path.join(parent_dir, 'does_not_exist')
+            self.assertRaises(FileNotFoundError, call_change_cwd,
+                              non_existent_dir)
+
+        self.assertEqual(os.getcwd(), original_cwd)
+
+    def test_change_cwd__non_existent_dir__quiet_true(self):
+        """Test passing a non-existent directory with quiet=True."""
+        original_cwd = os.getcwd()
+
+        with os_helper.temp_dir() as parent_dir:
+            bad_dir = os.path.join(parent_dir, 'does_not_exist')
+            with warnings_helper.check_warnings() as recorder, _caplog() as caplog:
+                with os_helper.change_cwd(bad_dir, quiet=True) as new_cwd:
+                    self.assertEqual(new_cwd, original_cwd)
+                    self.assertEqual(os.getcwd(), new_cwd)
+                warnings = [str(w.message) for w in recorder.warnings]
+
+        self.assertListEqual(warnings, [])
+        self.assertEqual(len(caplog.records), 1)
+        record = caplog.records[0]
+        self.assertStartsWith(
+            record.getMessage(),
+            f'tests may fail, unable to change '
+            f'the current working directory '
+            f'to {bad_dir!r}: '
+        )
+
+    # Tests for change_cwd()
+
+    def test_change_cwd__chdir_warning(self):
+        """Check the warning message when os.chdir() fails."""
+        path = TESTFN + '_does_not_exist'
+        with warnings_helper.check_warnings() as recorder, _caplog() as caplog:
+            with os_helper.change_cwd(path=path, quiet=True):
+                pass
+            messages = [str(w.message) for w in recorder.warnings]
+
+        self.assertListEqual(messages, [])
+        self.assertEqual(len(caplog.records), 1)
+        record = caplog.records[0]
+        self.assertStartsWith(
+            record.getMessage(),
+            f'tests may fail, unable to change '
+            f'the current working directory '
+            f'to {path!r}: ',
+        )
+
+    # Tests for temp_cwd()
+
+    def test_temp_cwd(self):
+        here = os.getcwd()
+        with os_helper.temp_cwd(name=TESTFN):
+            self.assertEqual(os.path.basename(os.getcwd()), TESTFN)
+        self.assertFalse(os.path.exists(TESTFN))
+        self.assertEqual(os.getcwd(), here)
+
+
+    def test_temp_cwd__name_none(self):
+        """Test passing None to temp_cwd()."""
+        original_cwd = os.getcwd()
+        with os_helper.temp_cwd(name=None) as new_cwd:
+            self.assertNotEqual(new_cwd, original_cwd)
+            self.assertTrue(os.path.isdir(new_cwd))
+            self.assertEqual(os.getcwd(), new_cwd)
+        self.assertEqual(os.getcwd(), original_cwd)
+
+    def test_sortdict(self):
+        self.assertEqual(support.sortdict({3:3, 2:2, 1:1}), "{1: 1, 2: 2, 3: 3}")
+
+    def test_make_bad_fd(self):
+        fd = os_helper.make_bad_fd()
+        with self.assertRaises(OSError) as cm:
+            os.write(fd, b"foo")
+        self.assertEqual(cm.exception.errno, errno.EBADF)
+
+    def test_check_syntax_error(self):
+        support.check_syntax_error(self, "def class", lineno=1, offset=5)
+        with self.assertRaises(AssertionError):
+            support.check_syntax_error(self, "x=1")
+
+    def test_CleanImport(self):
+        import importlib
+        with import_helper.CleanImport("pprint"):
+            importlib.import_module("pprint")
+
+    def test_DirsOnSysPath(self):
+        with import_helper.DirsOnSysPath('foo', 'bar'):
+            self.assertIn("foo", sys.path)
+            self.assertIn("bar", sys.path)
+        self.assertNotIn("foo", sys.path)
+        self.assertNotIn("bar", sys.path)
+
+    def test_captured_stdout(self):
+        with support.captured_stdout() as stdout:
+            print("hello")
+        self.assertEqual(stdout.getvalue(), "hello\n")
+
+    def test_captured_stderr(self):
+        with support.captured_stderr() as stderr:
+            print("hello", file=sys.stderr)
+        self.assertEqual(stderr.getvalue(), "hello\n")
+
+    def test_captured_stdin(self):
+        with support.captured_stdin() as stdin:
+            stdin.write('hello\n')
+            stdin.seek(0)
+            # call test code that consumes from sys.stdin
+            captured = input()
+        self.assertEqual(captured, "hello")
+
+    def test_gc_collect(self):
+        support.gc_collect()
+
+    def test_python_is_optimized(self):
+        self.assertIsInstance(support.python_is_optimized(), bool)
+
+    def test_swap_attr(self):
+        class Obj:
+            pass
+        obj = Obj()
+        obj.x = 1
+        with support.swap_attr(obj, "x", 5) as x:
+            self.assertEqual(obj.x, 5)
+            self.assertEqual(x, 1)
+        self.assertEqual(obj.x, 1)
+        with support.swap_attr(obj, "y", 5) as y:
+            self.assertEqual(obj.y, 5)
+            self.assertIsNone(y)
+        self.assertFalse(hasattr(obj, 'y'))
+        with support.swap_attr(obj, "y", 5):
+            del obj.y
+        self.assertFalse(hasattr(obj, 'y'))
+
+    def test_swap_item(self):
+        D = {"x":1}
+        with support.swap_item(D, "x", 5) as x:
+            self.assertEqual(D["x"], 5)
+            self.assertEqual(x, 1)
+        self.assertEqual(D["x"], 1)
+        with support.swap_item(D, "y", 5) as y:
+            self.assertEqual(D["y"], 5)
+            self.assertIsNone(y)
+        self.assertNotIn("y", D)
+        with support.swap_item(D, "y", 5):
+            del D["y"]
+        self.assertNotIn("y", D)
+
+    class RefClass:
+        attribute1 = None
+        attribute2 = None
+        _hidden_attribute1 = None
+        __magic_1__ = None
+
+    class OtherClass:
+        attribute2 = None
+        attribute3 = None
+        __magic_1__ = None
+        __magic_2__ = None
+
+    def test_detect_api_mismatch(self):
+        missing_items = support.detect_api_mismatch(self.RefClass,
+                                                    self.OtherClass)
+        self.assertEqual({'attribute1'}, missing_items)
+
+        missing_items = support.detect_api_mismatch(self.OtherClass,
+                                                    self.RefClass)
+        self.assertEqual({'attribute3', '__magic_2__'}, missing_items)
+
+    def test_detect_api_mismatch__ignore(self):
+        ignore = ['attribute1', 'attribute3', '__magic_2__', 'not_in_either']
+
+        missing_items = support.detect_api_mismatch(
+                self.RefClass, self.OtherClass, ignore=ignore)
+        self.assertEqual(set(), missing_items)
+
+        missing_items = support.detect_api_mismatch(
+                self.OtherClass, self.RefClass, ignore=ignore)
+        self.assertEqual(set(), missing_items)
+
+    def test_check__all__(self):
+        extra = {'tempdir'}
+        not_exported = {'template'}
+        support.check__all__(self,
+                             tempfile,
+                             extra=extra,
+                             not_exported=not_exported)
+
+        extra = {
+            'TextTestResult',
+            'installHandler',
+        }
+        not_exported = {'load_tests', "TestProgram", "BaseTestSuite"}
+        support.check__all__(self,
+                             unittest,
+                             ("unittest.result", "unittest.case",
+                              "unittest.suite", "unittest.loader",
+                              "unittest.main", "unittest.runner",
+                              "unittest.signals", "unittest.async_case"),
+                             extra=extra,
+                             not_exported=not_exported)
+
+        self.assertRaises(AssertionError, support.check__all__, self, unittest)
+
+    @unittest.skipUnless(hasattr(os, 'waitpid') and hasattr(os, 'WNOHANG'),
+                         'need os.waitpid() and os.WNOHANG')
+    @support.requires_fork()
+    def test_reap_children(self):
+        # Make sure that there is no other pending child process
+        support.reap_children()
+
+        # Create a child process
+        pid = os.fork()
+        if pid == 0:
+            # child process: do nothing, just exit
+            os._exit(0)
+
+        was_altered = support.environment_altered
+        try:
+            support.environment_altered = False
+            stderr = io.StringIO()
+
+            for _ in support.sleeping_retry(support.SHORT_TIMEOUT):
+                with support.swap_attr(support.print_warning, 'orig_stderr', stderr):
+                    support.reap_children()
+
+                # Use environment_altered to check if reap_children() found
+                # the child process
+                if support.environment_altered:
+                    break
+
+            msg = "Warning -- reap_children() reaped child process %s" % pid
+            self.assertIn(msg, stderr.getvalue())
+            self.assertTrue(support.environment_altered)
+        finally:
+            support.environment_altered = was_altered
+
+        # Just in case, check again that there is no other
+        # pending child process
+        support.reap_children()
+
+    @support.requires_subprocess()
+    def check_options(self, args, func, expected=None):
+        code = f'from test.support import {func}; print(repr({func}()))'
+        cmd = [sys.executable, *args, '-c', code]
+        env = {key: value for key, value in os.environ.items()
+               if not key.startswith('PYTHON')}
+        proc = subprocess.run(cmd,
+                              stdout=subprocess.PIPE,
+                              stderr=subprocess.DEVNULL,
+                              universal_newlines=True,
+                              env=env)
+        if expected is None:
+            expected = args
+        self.assertEqual(proc.stdout.rstrip(), repr(expected))
+        self.assertEqual(proc.returncode, 0)
+
+    @support.requires_resource('cpu')
+    def test_args_from_interpreter_flags(self):
+        # Test test.support.args_from_interpreter_flags()
+        for opts in (
+            # no option
+            [],
+            # single option
+            ['-B'],
+            ['-s'],
+            ['-S'],
+            ['-E'],
+            ['-v'],
+            ['-b'],
+            ['-P'],
+            ['-q'],
+            ['-I'],
+            # same option multiple times
+            ['-bb'],
+            ['-vvv'],
+            # -W options
+            ['-Wignore'],
+            # -X options
+            ['-X', 'dev'],
+            ['-Wignore', '-X', 'dev'],
+            ['-X', 'faulthandler'],
+            ['-X', 'importtime'],
+            ['-X', 'showrefcount'],
+            ['-X', 'tracemalloc'],
+            ['-X', 'tracemalloc=3'],
+        ):
+            with self.subTest(opts=opts):
+                self.check_options(opts, 'args_from_interpreter_flags')
+
+        self.check_options(['-I', '-E', '-s', '-P'],
+                           'args_from_interpreter_flags',
+                           ['-I'])
+
+    def test_optim_args_from_interpreter_flags(self):
+        # Test test.support.optim_args_from_interpreter_flags()
+        for opts in (
+            # no option
+            [],
+            ['-O'],
+            ['-OO'],
+            ['-OOOO'],
+        ):
+            with self.subTest(opts=opts):
+                self.check_options(opts, 'optim_args_from_interpreter_flags')
+
+    @unittest.skipIf(support.is_apple_mobile, "Unstable on Apple Mobile")
+    @unittest.skipIf(support.is_emscripten, "Unstable in Emscripten")
+    @unittest.skipIf(support.is_wasi, "Unavailable on WASI")
+    def test_fd_count(self):
+        # We cannot test the absolute value of fd_count(): on old Linux kernel
+        # or glibc versions, os.urandom() keeps a FD open on /dev/urandom
+        # device and Python has 4 FD opens instead of 3. Test is unstable on
+        # Emscripten and Apple Mobile platforms; these platforms start and stop
+        # background threads that use pipes and epoll fds.
+        start = os_helper.fd_count()
+        fd = os.open(__file__, os.O_RDONLY)
+        try:
+            more = os_helper.fd_count()
+        finally:
+            os.close(fd)
+        self.assertEqual(more - start, 1)
+
+    def check_print_warning(self, msg, expected):
+        stderr = io.StringIO()
+        with support.swap_attr(support.print_warning, 'orig_stderr', stderr):
+            support.print_warning(msg)
+        self.assertEqual(stderr.getvalue(), expected)
+
+    def test_print_warning(self):
+        self.check_print_warning("msg",
+                                 "Warning -- msg\n")
+        self.check_print_warning("a\nb",
+                                 'Warning -- a\nWarning -- b\n')
+
+    def test_has_strftime_extensions(self):
+        if support.is_emscripten or sys.platform == "win32":
+            self.assertFalse(support.has_strftime_extensions)
+        else:
+            self.assertTrue(support.has_strftime_extensions)
+
+    def test_get_recursion_depth(self):
+        # test support.get_recursion_depth()
+        code = textwrap.dedent("""
+            from test import support
+            import sys
+
+            def check(cond):
+                if not cond:
+                    raise AssertionError("test failed")
+
+            # depth 1
+            check(support.get_recursion_depth() == 1)
+
+            # depth 2
+            def test_func():
+                check(support.get_recursion_depth() == 2)
+            test_func()
+
+            def test_recursive(depth, limit):
+                if depth >= limit:
+                    # cannot call get_recursion_depth() at this depth,
+                    # it can raise RecursionError
+                    return
+                get_depth = support.get_recursion_depth()
+                print(f"test_recursive: {depth}/{limit}: "
+                      f"get_recursion_depth() says {get_depth}")
+                check(get_depth == depth)
+                test_recursive(depth + 1, limit)
+
+            # depth up to 25
+            with support.infinite_recursion(max_depth=25):
+                limit = sys.getrecursionlimit()
+                print(f"test with sys.getrecursionlimit()={limit}")
+                test_recursive(2, limit)
+
+            # depth up to 500
+            with support.infinite_recursion(max_depth=500):
+                limit = sys.getrecursionlimit()
+                print(f"test with sys.getrecursionlimit()={limit}")
+                test_recursive(2, limit)
+        """)
+        script_helper.assert_python_ok("-c", code)
+
+    def test_recursion(self):
+        # Test infinite_recursion() and get_recursion_available() functions.
+        def recursive_function(depth):
+            if depth:
+                recursive_function(depth - 1)
+
+        for max_depth in (5, 25, 250, 2500):
+            with support.infinite_recursion(max_depth):
+                available = support.get_recursion_available()
+
+                # Recursion up to 'available' additional frames should be OK.
+                recursive_function(available)
+
+                # Recursion up to 'available+1' additional frames must raise
+                # RecursionError. Avoid self.assertRaises(RecursionError) which
+                # can consume more than 3 frames and so raises RecursionError.
+                try:
+                    recursive_function(available + 1)
+                except RecursionError:
+                    pass
+                else:
+                    self.fail("RecursionError was not raised")
+
+        # Test the bare minimumum: max_depth=3
+        with support.infinite_recursion(3):
+            try:
+                recursive_function(3)
+            except RecursionError:
+                pass
+            else:
+                self.fail("RecursionError was not raised")
+
+    def test_parse_memlimit(self):
+        parse = support._parse_memlimit
+        KiB = 1024
+        MiB = KiB * 1024
+        GiB = MiB * 1024
+        TiB = GiB * 1024
+        self.assertEqual(parse('0k'), 0)
+        self.assertEqual(parse('3k'), 3 * KiB)
+        self.assertEqual(parse('2.4m'), int(2.4 * MiB))
+        self.assertEqual(parse('4g'), int(4 * GiB))
+        self.assertEqual(parse('1t'), TiB)
+
+        for limit in ('', '3', '3.5.10k', '10x'):
+            with self.subTest(limit=limit):
+                with self.assertRaises(ValueError):
+                    parse(limit)
+
+    def test_set_memlimit(self):
+        _4GiB = 4 * 1024 ** 3
+        TiB = 1024 ** 4
+        old_max_memuse = support.max_memuse
+        old_real_max_memuse = support.real_max_memuse
+        try:
+            if sys.maxsize > 2**32:
+                support.set_memlimit('4g')
+                self.assertEqual(support.max_memuse, _4GiB)
+                self.assertEqual(support.real_max_memuse, _4GiB)
+
+                big = 2**100 // TiB
+                support.set_memlimit(f'{big}t')
+                self.assertEqual(support.max_memuse, sys.maxsize)
+                self.assertEqual(support.real_max_memuse, big * TiB)
+            else:
+                support.set_memlimit('4g')
+                self.assertEqual(support.max_memuse, sys.maxsize)
+                self.assertEqual(support.real_max_memuse, _4GiB)
+        finally:
+            support.max_memuse = old_max_memuse
+            support.real_max_memuse = old_real_max_memuse
+
+    def test_copy_python_src_ignore(self):
+        # Get source directory
+        src_dir = sysconfig.get_config_var('abs_srcdir')
+        if not src_dir:
+            src_dir = sysconfig.get_config_var('srcdir')
+        src_dir = os.path.abspath(src_dir)
+
+        # Check that the source code is available
+        if not os.path.exists(src_dir):
+            self.skipTest(f"cannot access Python source code directory:"
+                          f" {src_dir!r}")
+        # Check that the landmark copy_python_src_ignore() expects is available
+        # (Previously we looked for 'Lib\os.py', which is always present on Windows.)
+        landmark = os.path.join(src_dir, 'Modules')
+        if not os.path.exists(landmark):
+            self.skipTest(f"cannot access Python source code directory:"
+                          f" {landmark!r} landmark is missing")
+
+        # Test support.copy_python_src_ignore()
+
+        # Source code directory
+        ignored = {'.git', '__pycache__'}
+        names = os.listdir(src_dir)
+        self.assertEqual(support.copy_python_src_ignore(src_dir, names),
+                         ignored | {'build'})
+
+        # Doc/ directory
+        path = os.path.join(src_dir, 'Doc')
+        self.assertEqual(support.copy_python_src_ignore(path, os.listdir(path)),
+                         ignored | {'build', 'venv'})
+
+        # Another directory
+        path = os.path.join(src_dir, 'Objects')
+        self.assertEqual(support.copy_python_src_ignore(path, os.listdir(path)),
+                         ignored)
+
+    def test_linked_to_musl(self):
+        linked = support.linked_to_musl()
+        self.assertIsInstance(linked, bool)
+
+    # XXX -follows a list of untested API
+    # make_legacy_pyc
+    # is_resource_enabled
+    # requires
+    # fcmp
+    # umaks
+    # findfile
+    # check_warnings
+    # EnvironmentVarGuard
+    # transient_internet
+    # run_with_locale
+    # bigmemtest
+    # precisionbigmemtest
+    # bigaddrspacetest
+    # requires_resource
+    # threading_cleanup
+    # reap_threads
+    # can_symlink
+    # skip_unless_symlink
+    # SuppressCrashReport
+
+
+if __name__ == '__main__':
+    unittest.main()