Merge with 3.1.

Lib/test/json_tests/test_decode.py

@@ -31,6 +31,11 @@ class TestDecode(TestCase):
         self.assertTrue(isinstance(rval, float))
         self.assertEqual(rval, 1.0)
 
+    def test_empty_objects(self):
+        self.assertEqual(json.loads('{}'), {})
+        self.assertEqual(json.loads('[]'), [])
+        self.assertEqual(json.loads('""'), "")
+
     def test_object_pairs_hook(self):
         s = '{"xkd":1, "kcw":2, "art":3, "hxm":4, "qrt":5, "pad":6, "hoy":7}'
         p = [("xkd", 1), ("kcw", 2), ("art", 3), ("hxm", 4),

Lib/test/json_tests/test_scanstring.py

@@ -1,14 +1,19 @@
 import sys
-import decimal
-from unittest import TestCase
+from unittest import TestCase, skipUnless
 
 import json
 import json.decoder
 
+try:
+    import _json
+except ImportError:
+    _json = None
+
 class TestScanString(TestCase):
     def test_py_scanstring(self):
         self._test_scanstring(json.decoder.py_scanstring)
 
+    @skipUnless(_json, 'test requires the _json module')
     def test_c_scanstring(self):
         if json.decoder.c_scanstring is not None:
             self._test_scanstring(json.decoder.c_scanstring)

Lib/test/json_tests/test_speedups.py

@@ -1,16 +1,22 @@
-from unittest import TestCase
+from unittest import TestCase, skipUnless
 
 from json import decoder, encoder, scanner
 
+try:
+    import _json
+except ImportError:
+    _json = None
+
+@skipUnless(_json, 'test requires the _json module')
 class TestSpeedups(TestCase):
     def test_scanstring(self):
         self.assertEqual(decoder.scanstring.__module__, "_json")
-        self.assertTrue(decoder.scanstring is decoder.c_scanstring)
+        self.assertIs(decoder.scanstring, decoder.c_scanstring)
 
     def test_encode_basestring_ascii(self):
         self.assertEqual(encoder.encode_basestring_ascii.__module__, "_json")
-        self.assertTrue(encoder.encode_basestring_ascii is
-                          encoder.c_encode_basestring_ascii)
+        self.assertIs(encoder.encode_basestring_ascii,
+                      encoder.c_encode_basestring_ascii)
 
 class TestDecode(TestCase):
     def test_make_scanner(self):