Added simple test and removed one import

PrettyJson.py

@@ -1,6 +1,5 @@
 import sublime
 import sublime_plugin
-import json
 import simplejson as json
 from simplejson import OrderedDict
 import decimal

tests.py

@@ -0,0 +1,24 @@
+import json
+import simplejson as json
+from simplejson import OrderedDict
+import decimal
+import unittest
+
+
+class TestFloatConversion(unittest.TestCase):
+
+    def setUp(self):
+        pass
+
+    def test_float(self):
+        tmp_str = '{ "float": 1.0 }'
+        obj = json.loads(tmp_str, object_pairs_hook=OrderedDict, parse_float=decimal.Decimal)
+        self.assertEqual(obj['float'], 1.0)
+        tmp_str = json.dumps(obj, indent=0, ensure_ascii=False, sort_keys=False,
+                    separators=(',', ': '),
+                    use_decimal=True)
+        self.assertEqual(tmp_str.split('\n')[1], u'"float": 1.0')
+
+
+if __name__ == '__main__':
+    unittest.main()