RustPython
diff --git a/‎.github/workflows/ci.yaml‎
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diff --git a/‎Lib/test/test_file_eintr.py‎
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diff --git a/‎Lib/test/test_importlib/resources/test_resource.py‎
Lines changed: 5 additions & 0 deletions b/‎Lib/test/test_importlib/resources/test_resource.py‎
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diff --git a/‎Lib/test/test_raise.py‎
Lines changed: 5 additions & 0 deletions b/‎Lib/test/test_raise.py‎
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diff --git a/‎Lib/test/test_ssl.py‎
Lines changed: 4 additions & 0 deletions b/‎Lib/test/test_ssl.py‎
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diff --git a/‎Lib/test/test_subprocess.py‎
Lines changed: 4 additions & 2 deletions b/‎Lib/test/test_subprocess.py‎
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diff --git a/‎Lib/test/test_sys.py‎
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@@ -105,6 +105,32 @@ env:
     test_unpack
     test_weakref
     test_yield_from
+  ENV_POLLUTING_TESTS_COMMON: >-
+    test_raise
+    test_ssl
+    test_sys
+  ENV_POLLUTING_TESTS_LINUX: >-
+    test.test_multiprocessing_fork.test_processes
+    test.test_multiprocessing_fork.test_threads
+    test.test_multiprocessing_forkserver.test_processes
+    test.test_multiprocessing_forkserver.test_threads
+    test.test_multiprocessing_spawn.test_processes
+    test.test_multiprocessing_spawn.test_threads
+    test_file_eintr
+    test_subprocess
+  ENV_POLLUTING_TESTS_MACOS: >-
+    test_multiprocessing_forkserver.test_manager
+    test.test_multiprocessing_forkserver.test_misc
+    test.test_multiprocessing_forkserver.test_processes
+    test.test_multiprocessing_forkserver.test_threads
+    test.test_multiprocessing_spawn.test_manager
+    test.test_multiprocessing_spawn.test_misc
+    test.test_multiprocessing_spawn.test_processes
+    test.test_multiprocessing_spawn.test_threads
+    test_ftplib
+    test_logging
+    test_multiprocessing_main_handling
+    test_subprocess
   # Python version targeted by the CI.
   PYTHON_VERSION: "3.13.1"
 
@@ -292,26 +318,47 @@ jobs:
 
       - if: runner.os == 'Linux'
         name: run cpython platform-independent tests
+        env:
+          RUSTPYTHON_SKIP_ENV_POLLUTERS: true
         run:
           target/release/rustpython -m test -j 1 -u all --slowest --fail-env-changed --timeout 600 -v ${{ env.PLATFORM_INDEPENDENT_TESTS }}
         timeout-minutes: 35
 
       - if: runner.os == 'Linux'
         name: run cpython platform-dependent tests (Linux)
+        env:
+          RUSTPYTHON_SKIP_ENV_POLLUTERS: true
         run: target/release/rustpython -m test -j 1 -u all --slowest --fail-env-changed --timeout 600 -v -x ${{ env.PLATFORM_INDEPENDENT_TESTS }}
         timeout-minutes: 35
 
       - if: runner.os == 'macOS'
         name: run cpython platform-dependent tests (MacOS)
+        env:
+          RUSTPYTHON_SKIP_ENV_POLLUTERS: true
         run: target/release/rustpython -m test -j 1 --slowest --fail-env-changed --timeout 600 -v -x ${{ env.PLATFORM_INDEPENDENT_TESTS }}
         timeout-minutes: 35
 
       - if: runner.os == 'Windows'
         name: run cpython platform-dependent tests (windows partial - fixme)
+        env:
+          RUSTPYTHON_SKIP_ENV_POLLUTERS: true
         run:
           target/release/rustpython -m test -j 1 --slowest --fail-env-changed --timeout 600 -v -x ${{ env.PLATFORM_INDEPENDENT_TESTS }} ${{ env.WINDOWS_SKIPS }}
         timeout-minutes: 45
 
+      - if: runner.os == 'Linux'
+        name: run cpython tests to check if env polluters have stopped polluting (Common/Linux)
+        run: |
+          for thing in ${{ env.ENV_POLLUTING_TESTS_COMMON }} ${{ env.ENV_POLLUTING_TESTS_LINUX }}; do
+            ! target/release/rustpython -m test -j 1 --slowest --fail-env-changed --timeout 600 -v ${thing}
+            exitcode=$?
+            if [ $exitcode -ne 0 ]; then
+              echo "Test ${thing} is no longer polluting the environment!"
+              exit 422
+            fi
+          done
+        timeout-minutes: 15
+
       - if: runner.os != 'Windows'
         name: check that --install-pip succeeds
         run: |
 
@@ -186,6 +186,10 @@ def test_readall(self):
 class CTestFileIOSignalInterrupt(TestFileIOSignalInterrupt, unittest.TestCase):
     modname = '_io'
 
+    @unittest.skipIf(
+        'RUSTPYTHON_SKIP_ENV_POLLUTERS' in os.environ,
+        "TODO: RUSTPYTHON environment pollution when running rustpython -m test --fail-env-changed due to unknown reason"
+    )
     # TODO: RUSTPYTHON - _io.FileIO.readall uses read_to_end which differs from _pyio.FileIO.readall
     @unittest.expectedFailure
     def test_readall(self):
 
@@ -192,6 +192,11 @@ def test_is_file_failure_does_not_keep_open(self):
     def test_as_file_does_not_keep_open(self):  # pragma: no cover
         resources.as_file(resources.files('ziptestdata') / 'binary.file')
 
+    import os  # TODO: RUSTPYTHON see below
+    @unittest.skipIf(
+        'RUSTPYTHON_SKIP_ENV_POLLUTERS' in os.environ,
+        "TODO: RUSTPYTHON environment pollution when running rustpython -m test --fail-env-changed due to tmpfile leak"
+    )
     def test_entered_path_does_not_keep_open(self):
         """
         Mimic what certifi does on import to make its bundle
 
@@ -464,6 +464,11 @@ def f():
 
         f()
 
+    import os  # TODO: RUSTPYTHON see below
+    @unittest.skipIf(
+        'RUSTPYTHON_SKIP_ENV_POLLUTERS' in os.environ,
+        "TODO: RUSTPYTHON environment pollution when running rustpython -m test --fail-env-changed due to unraisable exception"
+    )
     def test_3611(self):
         import gc
         # A re-raised exception in a __del__ caused the __context__
 
@@ -4299,6 +4299,10 @@ def cb_returning_alert(ssl_sock, server_name, initial_context):
                                        sni_name='supermessage')
         self.assertEqual(cm.exception.reason, 'TLSV1_ALERT_ACCESS_DENIED')
 
+    @unittest.skipIf(
+        'RUSTPYTHON_SKIP_ENV_POLLUTERS' in os.environ,
+        "TODO: RUSTPYTHON environment pollution when running rustpython -m test --fail-env-changed due to unraisable exception"
+    )
     @unittest.expectedFailure  # TODO: RUSTPYTHON
     def test_sni_callback_raising(self):
         # Raising fails the connection with a TLS handshake failure alert.
 
@@ -1292,8 +1292,10 @@ def test_universal_newlines_communicate_stdin_stdout_stderr(self):
         # to stderr at exit of subprocess.
         self.assertTrue(stderr.startswith("eline2\neline6\neline7\n"))
 
-    # TODO: RUSTPYTHON
-    @unittest.expectedFailure
+    @unittest.skipIf(
+        'RUSTPYTHON_SKIP_ENV_POLLUTERS' in os.environ,
+        "TODO: RUSTPYTHON environment pollution when running rustpython -m test --fail-env-changed due to unknown reason"
+    )
     def test_universal_newlines_communicate_encodings(self):
         # Check that universal newlines mode works for various encodings,
         # in particular for encodings in the UTF-16 and UTF-32 families.
 
@@ -595,6 +595,11 @@ def g456():
             leave_g.set()
             t.join()
 
+    import os  # TODO: RUSTPYTHON see below
+    @unittest.skipIf(
+        'RUSTPYTHON_SKIP_ENV_POLLUTERS' in os.environ,
+        "TODO: RUSTPYTHON environment pollution when running rustpython -m test --fail-env-changed due to dangling threads"
+    )
     @unittest.expectedFailure # TODO: RUSTPYTHON; AttributeError: module 'sys' has no attribute '_current_exceptions'
     @threading_helper.reap_threads
     @threading_helper.requires_working_threading()