Fixes #102: Improve aggregations method tests.

This commits adds:
- Proper response message on null query arguments.
- Tests for aggregations() method with null query
  arguments.

Author: YJDave

loklak.py

@@ -420,7 +420,7 @@ def aggregations(self, query=None, since=None, until=None,
                 return json.dumps(return_to_user)
         else:
             return_to_user = {}
-            return_to_user['error'] = ('No Query string has been given to run'
+            return_to_user['error'] = ('No Query string has been given to run '
                                         'query for aggregations')
             return json.dumps(return_to_user)
 

tests/test.py

@@ -127,6 +127,9 @@ def test_aggregations(self):
         data = result.json()
         self.assertEqual(result.status_code, 200)
         self.assertTrue('aggregations' in data)
+
+        result = self.loklak.aggregations()
+        self.assertEqual(result, '{"error": "No Query string has been given to run query for aggregations"}')
     #     self.assertTrue('hashtags' in data['aggregations'])
     #     self.assertTrue('mentions' in data['aggregations'])