diff --git a/tests/snippets/stdlib_datetime.py b/tests/snippets/stdlib_datetime.py
new file mode 100644
index 000000000..d9ddb3236
--- /dev/null
+++ b/tests/snippets/stdlib_datetime.py
@@ -0,0 +1,48 @@
+import unittest
+import sys
+from test.support import import_fresh_module, run_unittest
+
+TESTS = 'test.datetimetester'
+
+# XXX: import_fresh_module() is supposed to leave sys.module cache untouched,
+# XXX: but it does not, so we have to save and restore it ourselves.
+save_sys_modules = sys.modules.copy()
+try:
+    pure_tests = import_fresh_module(TESTS, fresh=['datetime', '_strptime'],
+                                     blocked=['_datetime'])
+    fast_tests = import_fresh_module(TESTS, fresh=['datetime',
+                                                   '_datetime', '_strptime'])
+finally:
+    sys.modules.clear()
+    sys.modules.update(save_sys_modules)
+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.
+test_classes = []
+
+for module, suffix in zip(test_modules, test_suffixes):
+    for name, cls in module.__dict__.items():
+        if not (isinstance(cls, type) and issubclass(cls, unittest.TestCase)):
+            continue
+        cls.__name__ = name + 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
+        test_classes.append(cls)
+
+def test_main():
+    run_unittest(*test_classes)
+
+if __name__ == "__main__":
+    test_main()