python-3.6.zip added from Github

README.cosmo contains the necessary links.

third_party/python/Lib/test/test_datetime.py

@@ -0,0 +1,57 @@
+import unittest
+import sys
+
+from test.support import import_fresh_module, run_unittest
+
+TESTS = 'test.datetimetester'
+
+try:
+    pure_tests = import_fresh_module(TESTS, fresh=['datetime', '_strptime'],
+                                     blocked=['_datetime'])
+    fast_tests = import_fresh_module(TESTS, fresh=['datetime',
+                                                   '_datetime', '_strptime'])
+finally:
+    # XXX: import_fresh_module() is supposed to leave sys.module cache untouched,
+    # XXX: but it does not, so we have to cleanup ourselves.
+    for modname in ['datetime', '_datetime', '_strptime']:
+        sys.modules.pop(modname, None)
+test_modules = [pure_tests, fast_tests]
+test_suffixes = ["_Pure", "_Fast"]
+# XXX(gb) First run all the _Pure tests, then all the _Fast tests.  You might
+# not believe this, but in spite of all the sys.modules trickery running a _Pure
+# test last will leave a mix of pure and native datetime stuff lying around.
+all_test_classes = []
+
+for module, suffix in zip(test_modules, test_suffixes):
+    test_classes = []
+    for name, cls in module.__dict__.items():
+        if not isinstance(cls, type):
+            continue
+        if issubclass(cls, unittest.TestCase):
+            test_classes.append(cls)
+        elif issubclass(cls, unittest.TestSuite):
+            suit = cls()
+            test_classes.extend(type(test) for test in suit)
+    test_classes = sorted(set(test_classes), key=lambda cls: cls.__qualname__)
+    for cls in test_classes:
+        cls.__name__ += suffix
+        cls.__qualname__ += suffix
+        @classmethod
+        def setUpClass(cls_, module=module):
+            cls_._save_sys_modules = sys.modules.copy()
+            sys.modules[TESTS] = module
+            sys.modules['datetime'] = module.datetime_module
+            sys.modules['_strptime'] = module._strptime
+        @classmethod
+        def tearDownClass(cls_):
+            sys.modules.clear()
+            sys.modules.update(cls_._save_sys_modules)
+        cls.setUpClass = setUpClass
+        cls.tearDownClass = tearDownClass
+    all_test_classes.extend(test_classes)
+
+def test_main():
+    run_unittest(*all_test_classes)
+
+if __name__ == "__main__":
+    test_main()