Fix: Circular reference detected error (#332)

* Rename function name

* Add uuid handler on json dumps

* Add myself to authors

test_tablib.py

@@ -6,6 +6,7 @@ import doctest
 import json
 import unittest
 import sys
+from uuid import uuid4
 
 import datetime
 
@@ -226,6 +227,22 @@ class TablibTestCase(unittest.TestCase):
 
         # Delete from invalid index
         self.assertRaises(IndexError, self.founders.__delitem__, 3)
+            
+    def test_json_export(self):
+        """Verify exporting dataset object as JSON"""
+        
+        address_id = uuid4()
+        headers = self.headers + ('address_id',)
+        founders = tablib.Dataset(headers=headers, title='Founders')
+        founders.append(('John', 'Adams', 90, address_id))
+        founders_json = founders.export('json')
+        
+        expected_json = (
+            '[{"first_name": "John", "last_name": "Adams", "gpa": 90, '
+            '"address_id": "%s"}]' % str(address_id)
+        )
+        
+        self.assertEqual(founders_json, expected_json)
 
     def test_csv_export(self):
         """Verify exporting dataset object as CSV."""