Skip some tests that require a subinterpreter launched with -E or -I when the

interpreter under test is being run in an environment that requires the use of
environment variables such as PYTHONHOME in order to function at all.

Adds a test.script_helper.interpreter_requires_environment() function
to be used with @unittest.skipIf on stdlib test methods requiring this.

1 files changed, 18 insertions, 0 deletions

diff --git a/Lib/test/test_functools.py b/Lib/test/test_functools.py
index 10120530b8..fbb43e43e6 100644
--- a/Lib/test/test_functools.py
+++ b/Lib/test/test_functools.py
@@ -880,6 +880,24 @@ class TestTotalOrdering(unittest.TestCase):
             with self.assertRaises(TypeError):
                 a <= b
 
+    def test_pickle(self):
+        for proto in range(4, pickle.HIGHEST_PROTOCOL + 1):
+            for name in '__lt__', '__gt__', '__le__', '__ge__':
+                with self.subTest(method=name, proto=proto):
+                    method = getattr(Orderable_LT, name)
+                    method_copy = pickle.loads(pickle.dumps(method, proto))
+                    self.assertIs(method_copy, method)
+
+@functools.total_ordering
+class Orderable_LT:
+    def __init__(self, value):
+        self.value = value
+    def __lt__(self, other):
+        return self.value < other.value
+    def __eq__(self, other):
+        return self.value == other.value
+
+
 class TestLRU(unittest.TestCase):
 
     def test_lru(self):