bpo-25094: Fix test_tools.test_sundry() on Windows (GH-8406)

When Python is installed on Windows, python -m test test_tools failed
because it tried to run Tools\scripts\2to3.py which requires an
argument. Skip this script. On other platforms or on Windows but when
run from source code (not installed), the script is called "2to3"
instead of "2to.py" and so was already skipped.

Modify also the unit test to unload all modules which have been
loaded by the test.
(cherry picked from commit 752d4b7531093c55d6f0a5846748f981d79b29d3)

Co-authored-by: Victor Stinner <vstinner@redhat.com>

diff --git a/Lib/test/test_tools/test_sundry.py b/Lib/test/test_tools/test_sundry.py
index 39e541b45bd264fb81cdaf079a27429de3dbbab3..00b8789929a5256bc4ea374bf01cdcfd18492457 100644 (file)
--- a/Lib/test/test_tools/test_sundry.py
+++ b/Lib/test/test_tools/test_sundry.py
@@ -25,15 +25,25 @@ class TestSundryScripts(unittest.TestCase):
     # scripts that use windows-only modules
     windows_only = ['win_add2path']
     # blacklisted for other reasons
-    other = ['analyze_dxp']
+    other = ['analyze_dxp', '2to3']
 
     skiplist = blacklist + whitelist + windows_only + other
 
     def test_sundry(self):
-        for fn in os.listdir(scriptsdir):
-            name = fn[:-3]
-            if fn.endswith('.py') and name not in self.skiplist:
+        old_modules = support.modules_setup()
+        try:
+            for fn in os.listdir(scriptsdir):
+                if not fn.endswith('.py'):
+                    continue
+
+                name = fn[:-3]
+                if name in self.skiplist:
+                    continue
+
                 import_tool(name)
+        finally:
+            # Unload all modules loaded in this test
+            support.modules_cleanup(*old_modules)
 
     @unittest.skipIf(sys.platform != "win32", "Windows-only test")
     def test_sundry_windows(self):