Fix truncated JSON validation error message

CHANGES.txt

@@ -6,7 +6,10 @@ CHANGELOG
 2.1.0 (unreleased)
 ==================
 
-- Nothing changed yet.
+**Bug fixes**
+
+- Fix truncated JSON validation error message when request body does not contain
+  valid JSON
 
 
 2.0.0 (2016-10-20)

cornice/validators/__init__.py

@@ -28,8 +28,8 @@ def extract_cstruct(request):
         if request.body:
             try:
                 body = request.json_body
-            except ValueError:
-                request.errors.add('body', '', 'Invalid JSON')
+            except ValueError as e:
+                request.errors.add('body', '', 'Invalid JSON: %s' % e)
                 return {}
             else:
                 if not hasattr(body, 'items'):

tests/test_validation.py

@@ -379,7 +379,7 @@ def test_invalid_json(self):
                             status=400)
         self.assertEqual(response.json['status'], 'error')
         error_description = response.json['errors'][0]['description']
-        self.assertIn('Invalid JSON', error_description)
+        self.assertIn('Invalid JSON: Expecting object', error_description)
 
     def test_json_text(self):
         app = self.make_ordinary_app()