python
diff --git a/‎Lib/distutils/tests/__init__.py
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+6Lines changed: 6 additions & 0 deletions b/‎Lib/distutils/tests/__init__.py
Copy file name to clipboardExpand all lines: Lib/distutils/tests/__init__.py
+6Lines changed: 6 additions & 0 deletions
diff --git a/‎Misc/NEWS.d/next/Tests/2020-05-15-01-21-44.bpo-40055.Xp4aP9.rst
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+3Lines changed: 3 additions & 0 deletions b/‎Misc/NEWS.d/next/Tests/2020-05-15-01-21-44.bpo-40055.Xp4aP9.rst
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+3Lines changed: 3 additions & 0 deletions
@@ -15,20 +15,26 @@
 import os
 import sys
 import unittest
+import warnings
 from test.support import run_unittest
 
 
 here = os.path.dirname(__file__) or os.curdir
 
 
 def test_suite():
+    old_filters = warnings.filters[:]
     suite = unittest.TestSuite()
     for fn in os.listdir(here):
         if fn.startswith("test") and fn.endswith(".py"):
             modname = "distutils.tests." + fn[:-3]
             __import__(modname)
             module = sys.modules[modname]
             suite.addTest(module.test_suite())
+    # bpo-40055: Save/restore warnings filters to leave them unchanged.
+    # Importing tests imports docutils which imports pkg_resources which adds a
+    # warnings filter.
+    warnings.filters[:] = old_filters
     return suite
 
 
 
@@ -0,0 +1,3 @@
+distutils.tests now saves/restores warnings filters to leave them unchanged.
+Importing tests imports docutils which imports pkg_resources which adds a
+warnings filter.