diff --git a/Lib/test/support/__init__.py b/Lib/test/support/__init__.py
index 2aec065d4da457..39b3530905b44d 100644
--- a/Lib/test/support/__init__.py
+++ b/Lib/test/support/__init__.py
@@ -1773,6 +1773,16 @@ def cleanup():
setattr(object_to_patch, attr_name, new_value)
+@contextlib.contextmanager
+def patch_list(orig):
+ """Like unittest.mock.patch.dict, but for lists."""
+ try:
+ saved = orig[:]
+ yield
+ finally:
+ orig[:] = saved
+
+
def run_in_subinterp(code):
"""
Run code in a subinterpreter. Raise unittest.SkipTest if the tracemalloc
diff --git a/Lib/test/test_bdb.py b/Lib/test/test_bdb.py
index 6ec59531fa88f0..87a5ac308a12df 100644
--- a/Lib/test/test_bdb.py
+++ b/Lib/test/test_bdb.py
@@ -59,6 +59,7 @@
from itertools import islice, repeat
from test.support import import_helper
from test.support import os_helper
+from test.support import patch_list
class BdbException(Exception): pass
@@ -713,9 +714,18 @@ def test_until_in_caller_frame(self):
with TracerRun(self) as tracer:
tracer.runcall(tfunc_main)
+ @patch_list(sys.meta_path)
def test_skip(self):
# Check that tracing is skipped over the import statement in
# 'tfunc_import()'.
+
+ # Remove all but the standard importers.
+ sys.meta_path[:] = (
+ item
+ for item in sys.meta_path
+ if item.__module__.startswith('_frozen_importlib')
+ )
+
code = """
def main():
lno = 3
diff --git a/Misc/NEWS.d/next/Tests/2022-06-17-15-20-09.gh-issue-93951.CW1Vv4.rst b/Misc/NEWS.d/next/Tests/2022-06-17-15-20-09.gh-issue-93951.CW1Vv4.rst
new file mode 100644
index 00000000000000..b627466b4b221c
--- /dev/null
+++ b/Misc/NEWS.d/next/Tests/2022-06-17-15-20-09.gh-issue-93951.CW1Vv4.rst
@@ -0,0 +1 @@
+In test_bdb.StateTestCase.test_skip, avoid including auxiliary importers.
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