1 files changed, 42 insertions, 4 deletions
diff --git a/Lib/json/tests/__init__.py b/Lib/json/tests/__init__.py
index 1a1e3e6d5a..90cb2b7ad6 100644
--- a/Lib/json/tests/__init__.py
+++ b/Lib/json/tests/__init__.py
@@ -1,7 +1,46 @@
 import os
 import sys
-import unittest
+import json
 import doctest
+import unittest
+
+from test import test_support
+
+# import json with and without accelerations
+cjson = test_support.import_fresh_module('json', fresh=['_json'])
+pyjson = test_support.import_fresh_module('json', blocked=['_json'])
+
+# create two base classes that will be used by the other tests
+class PyTest(unittest.TestCase):
+    json = pyjson
+    loads = staticmethod(pyjson.loads)
+    dumps = staticmethod(pyjson.dumps)
+
+@unittest.skipUnless(cjson, 'requires _json')
+class CTest(unittest.TestCase):
+    if cjson is not None:
+        json = cjson
+        loads = staticmethod(cjson.loads)
+        dumps = staticmethod(cjson.dumps)
+
+# test PyTest and CTest checking if the functions come from the right module
+class TestPyTest(PyTest):
+    def test_pyjson(self):
+        self.assertEqual(self.json.scanner.make_scanner.__module__,
+                         'json.scanner')
+        self.assertEqual(self.json.decoder.scanstring.__module__,
+                         'json.decoder')
+        self.assertEqual(self.json.encoder.encode_basestring_ascii.__module__,
+                         'json.encoder')
+
+class TestCTest(CTest):
+    def test_cjson(self):
+        self.assertEqual(self.json.scanner.make_scanner.__module__, '_json')
+        self.assertEqual(self.json.decoder.scanstring.__module__, '_json')
+        self.assertEqual(self.json.encoder.c_make_encoder.__module__, '_json')
+        self.assertEqual(self.json.encoder.encode_basestring_ascii.__module__,
+                         '_json')
+
 
 here = os.path.dirname(__file__)
 
@@ -17,12 +56,11 @@ def test_suite():
     return suite
 
 def additional_tests():
-    import json
-    import json.encoder
-    import json.decoder
     suite = unittest.TestSuite()
     for mod in (json, json.encoder, json.decoder):
         suite.addTest(doctest.DocTestSuite(mod))
+    suite.addTest(TestPyTest('test_pyjson'))
+    suite.addTest(TestCTest('test_cjson'))
     return suite
 
 def main():