diff --git a/Lib/test/test_cppext.py b/Lib/test/test_cppext/__init__.py
similarity index 91%
rename from Lib/test/test_cppext.py
rename to Lib/test/test_cppext/__init__.py
index e2fedc97350..f3d32a3c761 100644
--- a/Lib/test/test_cppext.py
+++ b/Lib/test/test_cppext/__init__.py
@@ -11,9 +11,8 @@ from test.support import os_helper
 
 
 MS_WINDOWS = (sys.platform == 'win32')
-
-
-SETUP_TESTCPPEXT = support.findfile('setup_testcppext.py')
+SOURCE = os.path.join(os.path.dirname(__file__), 'extension.cpp')
+SETUP = os.path.join(os.path.dirname(__file__), 'setup.py')
 
 
 @support.requires_subprocess()
@@ -42,7 +41,8 @@ class TestCPPExt(unittest.TestCase):
     def _check_build(self, std_cpp03, extension_name, python_exe):
         pkg_dir = 'pkg'
         os.mkdir(pkg_dir)
-        shutil.copy(SETUP_TESTCPPEXT, os.path.join(pkg_dir, "setup.py"))
+        shutil.copy(SETUP, os.path.join(pkg_dir, os.path.basename(SETUP)))
+        shutil.copy(SOURCE, os.path.join(pkg_dir, os.path.basename(SOURCE)))
 
         def run_cmd(operation, cmd):
             env = os.environ.copy()
diff --git a/Lib/test/_testcppext.cpp b/Lib/test/test_cppext/extension.cpp
similarity index 99%
rename from Lib/test/_testcppext.cpp
rename to Lib/test/test_cppext/extension.cpp
index 82b471312dd..90669b10cb2 100644
--- a/Lib/test/_testcppext.cpp
+++ b/Lib/test/test_cppext/extension.cpp
@@ -1,5 +1,7 @@
 // gh-91321: Very basic C++ test extension to check that the Python C API is
 // compatible with C++ and does not emit C++ compiler warnings.
+//
+// The code is only built, not executed.
 
 // Always enable assertions
 #undef NDEBUG
diff --git a/Lib/test/setup_testcppext.py b/Lib/test/test_cppext/setup.py
similarity index 93%
rename from Lib/test/setup_testcppext.py
rename to Lib/test/test_cppext/setup.py
index 22fe750085f..6867094a420 100644
--- a/Lib/test/setup_testcppext.py
+++ b/Lib/test/test_cppext/setup.py
@@ -2,7 +2,6 @@
 # compatible with C++ and does not emit C++ compiler warnings.
 import os
 import sys
-from test import support
 
 from setuptools import setup, Extension
 
@@ -10,7 +9,7 @@ from setuptools import setup, Extension
 MS_WINDOWS = (sys.platform == 'win32')
 
 
-SOURCE = support.findfile('_testcppext.cpp')
+SOURCE = 'extension.cpp'
 if not MS_WINDOWS:
     # C++ compiler flags for GCC and clang
     CPPFLAGS = [
diff --git a/Makefile.pre.in b/Makefile.pre.in
index d9d56bb45ce..ae6a12c2a2c 100644
--- a/Makefile.pre.in
+++ b/Makefile.pre.in
@@ -2132,6 +2132,7 @@ TESTSUBDIRS=	idlelib/idle_test \
 		test/support/_hypothesis_stubs \
 		test/test_asyncio \
 		test/test_capi \
+		test/test_cppext \
 		test/test_ctypes \
 		test/test_email \
 		test/test_email/data \