Issue #17767: test_locale now works with unittest test discovery.

Original patch by Zachary Ware.

Lib/test/test_locale.py

-from test.support import run_unittest, verbose
+from test.support import verbose
 import unittest
 import locale
 import sys
 import codecs
 
-enUS_locale = None
+class BaseLocalizedTest(unittest.TestCase):
+    #
+    # Base class for tests using a real locale
+    #
 
-def get_enUS_locale():
-    global enUS_locale
+    @classmethod
+    def setUpClass(cls):
         if sys.platform == 'darwin':
             import os
             tlocs = ("en_US.UTF-8", "en_US.ISO8859-1", "en_US")
@@ -19,7 +22,9 @@ def get_enUS_locale():
         elif sys.platform.startswith("win"):
             tlocs = ("En", "English")
         else:
-        tlocs = ("en_US.UTF-8", "en_US.ISO8859-1", "en_US.US-ASCII", "en_US")
+            tlocs = ("en_US.UTF-8", "en_US.ISO8859-1",
+                     "en_US.US-ASCII", "en_US")
+        try:
             oldlocale = locale.setlocale(locale.LC_NUMERIC)
             for tloc in tlocs:
                 try:
@@ -28,25 +33,18 @@ def get_enUS_locale():
                     continue
                 break
             else:
-        raise unittest.SkipTest(
-            "Test locale not supported (tried %s)" % (', '.join(tlocs)))
-    enUS_locale = tloc
+                raise unittest.SkipTest("Test locale not supported "
+                                        "(tried %s)" % (', '.join(tlocs)))
+            cls.enUS_locale = tloc
+        finally:
             locale.setlocale(locale.LC_NUMERIC, oldlocale)
 
-
-class BaseLocalizedTest(unittest.TestCase):
-    #
-    # Base class for tests using a real locale
-    #
-
     def setUp(self):
-        self.oldlocale = locale.setlocale(self.locale_type)
-        locale.setlocale(self.locale_type, enUS_locale)
+        oldlocale = locale.setlocale(self.locale_type)
+        self.addCleanup(locale.setlocale, self.locale_type, oldlocale)
+        locale.setlocale(self.locale_type, self.enUS_locale)
         if verbose:
-            print("testing with \"%s\"..." % enUS_locale, end=' ')
-
-    def tearDown(self):
-        locale.setlocale(self.locale_type, self.oldlocale)
+            print("testing with %r..." % self.enUS_locale, end=' ', flush=True)
 
 
 class BaseCookedTest(unittest.TestCase):
@@ -415,25 +413,5 @@ class TestMiscellaneous(unittest.TestCase):
             locale.setlocale(locale.LC_ALL, (b'not', b'valid'))
 
 
-def test_main():
-    tests = [
-        TestMiscellaneous,
-        TestFormatPatternArg,
-        TestLocaleFormatString,
-        TestEnUSNumberFormatting,
-        TestCNumberFormatting,
-        TestFrFRNumberFormatting,
-        TestCollation
-    ]
-    # SkipTest can't be raised inside unittests, handle it manually instead
-    try:
-        get_enUS_locale()
-    except unittest.SkipTest as e:
-        if verbose:
-            print("Some tests will be disabled: %s" % e)
-    else:
-        tests += [TestNumberFormatting, TestEnUSCollation]
-    run_unittest(*tests)
-
 if __name__ == '__main__':
-    test_main()
+    unittest.main()

Misc/NEWS

@@ -198,6 +198,9 @@ IDLE
 Tests
 -----
 
+- Issue #17767: test_locale now works with unittest test discovery.
+  Original patch by Zachary Ware.
+
 - Issue #18375: Assume --randomize when --randseed is used for running the
   testsuite.