Update support/import_helper.py from 3.13.11 (RustPython#6451)

* Update `support/import_helper.py` from 3.13.11

* Unmark passing test

Author: ShaharNaveh

Lib/test/support/import_helper.py

@@ -8,7 +8,7 @@
 import unittest
 import warnings
 
-from .os_helper import unlink
+from .os_helper import unlink, temp_dir
 
 
 @contextlib.contextmanager
@@ -58,8 +58,8 @@ def make_legacy_pyc(source):
     :return: The file system path to the legacy pyc file.
     """
     pyc_file = importlib.util.cache_from_source(source)
-    up_one = os.path.dirname(os.path.abspath(source))
-    legacy_pyc = os.path.join(up_one, source + 'c')
+    assert source.endswith('.py')
+    legacy_pyc = source + 'c'
     shutil.move(pyc_file, legacy_pyc)
     return legacy_pyc
 
@@ -114,7 +114,7 @@ def multi_interp_extensions_check(enabled=True):
     This only applies to modules that haven't been imported yet.
     It overrides the PyInterpreterConfig.check_multi_interp_extensions
     setting (see support.run_in_subinterp_with_config() and
-    _xxsubinterpreters.create()).
+    _interpreters.create()).
 
     Also see importlib.utils.allowing_all_extensions().
     """
@@ -268,9 +268,44 @@ def modules_cleanup(oldmodules):
     sys.modules.update(oldmodules)
 
 
+@contextlib.contextmanager
+def isolated_modules():
+    """
+    Save modules on entry and cleanup on exit.
+    """
+    (saved,) = modules_setup()
+    try:
+        yield
+    finally:
+        modules_cleanup(saved)
+
+
 def mock_register_at_fork(func):
     # bpo-30599: Mock os.register_at_fork() when importing the random module,
     # since this function doesn't allow to unregister callbacks and would leak
     # memory.
     from unittest import mock
     return mock.patch('os.register_at_fork', create=True)(func)
+
+
+@contextlib.contextmanager
+def ready_to_import(name=None, source=""):
+    from test.support import script_helper
+
+    # 1. Sets up a temporary directory and removes it afterwards
+    # 2. Creates the module file
+    # 3. Temporarily clears the module from sys.modules (if any)
+    # 4. Reverts or removes the module when cleaning up
+    name = name or "spam"
+    with temp_dir() as tempdir:
+        path = script_helper.make_script(tempdir, name, source)
+        old_module = sys.modules.pop(name, None)
+        try:
+            sys.path.insert(0, tempdir)
+            yield name, path
+            sys.path.remove(tempdir)
+        finally:
+            if old_module is not None:
+                sys.modules[name] = old_module
+            else:
+                sys.modules.pop(name, None)

Lib/test/test_super.py

@@ -349,7 +349,6 @@ def test_super_argtype(self):
         with self.assertRaisesRegex(TypeError, "argument 1 must be a type"):
             super(1, int)
 
-    @unittest.expectedFailure # TODO: RUSTPYTHON; AttributeError: module 'test.support.import_helper' has no attribute 'ready_to_import'
     def test_shadowed_global(self):
         source = textwrap.dedent(
             """