diff --git a/tempest/tests/negative/__init__.py b/tempest/tests/negative/__init__.py
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/tempest/tests/negative/__init__.py
diff --git a/tempest/tests/negative/test_generate_json.py b/tempest/tests/negative/test_generate_json.py
new file mode 100644
index 0000000..a0aa088
--- /dev/null
+++ b/tempest/tests/negative/test_generate_json.py
@@ -0,0 +1,53 @@
+# Copyright 2014 Deutsche Telekom AG
+# All Rights Reserved.
+#
+#    Licensed under the Apache License, Version 2.0 (the "License"); you may
+#    not use this file except in compliance with the License. You may obtain
+#    a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#    License for the specific language governing permissions and limitations
+#    under the License.
+
+from tempest.common import generate_json as gen
+import tempest.test
+
+
+class TestGenerateJson(tempest.test.BaseTestCase):
+
+    fake_input_str = {"type": "string",
+                      "minLength": 2,
+                      "maxLength": 8,
+                      'results': {'gen_number': 404}}
+
+    fake_input_int = {"type": "integer",
+                      "maximum": 255,
+                      "minimum": 1}
+
+    fake_input_obj = {"type": "object",
+                      "properties": {"minRam": {"type": "integer"},
+                                     "diskName": {"type": "string"},
+                                     "maxRam": {"type": "integer", }
+                                     }
+                      }
+
+    def _validate_result(self, data):
+        self.assertTrue(isinstance(data, list))
+        for t in data:
+            self.assertTrue(isinstance(t, tuple))
+
+    def test_generate_invalid_string(self):
+        result = gen.generate_invalid(self.fake_input_str)
+        self._validate_result(result)
+
+    def test_generate_invalid_integer(self):
+        result = gen.generate_invalid(self.fake_input_int)
+        self._validate_result(result)
+
+    def test_generate_invalid_obj(self):
+        result = gen.generate_invalid(self.fake_input_obj)
+        self._validate_result(result)
diff --git a/tempest/tests/negative/test_negative_auto_test.py b/tempest/tests/negative/test_negative_auto_test.py
new file mode 100644
index 0000000..4c59383
--- /dev/null
+++ b/tempest/tests/negative/test_negative_auto_test.py
@@ -0,0 +1,64 @@
+# Copyright 2014 Deutsche Telekom AG
+# All Rights Reserved.
+#
+#    Licensed under the Apache License, Version 2.0 (the "License"); you may
+#    not use this file except in compliance with the License. You may obtain
+#    a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#    License for the specific language governing permissions and limitations
+#    under the License.
+
+import mock
+
+import tempest.test as test
+
+
+class TestNegativeAutoTest(test.BaseTestCase):
+    # Fake entries
+    _interface = 'json'
+    _service = 'compute'
+
+    fake_input_desc = {"name": "list-flavors-with-detail",
+                       "http-method": "GET",
+                       "url": "flavors/detail",
+                       "json-schema": {"type": "object",
+                                      "properties":
+                                      {"minRam": {"type": "integer"},
+                                       "minDisk": {"type": "integer"}}
+                                       },
+                       "resources": ["flavor", "volume", "image"]
+                       }
+
+    def _check_prop_entries(self, result, entry):
+        entries = [a for a in result if entry in a[0]]
+        self.assertIsNotNone(entries)
+        self.assertIs(len(entries), 2)
+        for entry in entries:
+            self.assertIsNotNone(entry[1]['schema'])
+
+    def _check_resource_entries(self, result, entry):
+        entries = [a for a in result if entry in a[0]]
+        self.assertIsNotNone(entries)
+        self.assertIs(len(entries), 3)
+        for entry in entries:
+            self.assertIsNotNone(entry[1]['resource'])
+
+    @mock.patch('tempest.test.NegativeAutoTest.load_schema')
+    def test_generate_scenario(self, open_mock):
+        open_mock.return_value = self.fake_input_desc
+        scenarios = test.NegativeAutoTest.\
+            generate_scenario(None)
+
+        self.assertIsInstance(scenarios, list)
+        for scenario in scenarios:
+            self.assertIsInstance(scenario, tuple)
+            self.assertIsInstance(scenario[0], str)
+            self.assertIsInstance(scenario[1], dict)
+        self._check_prop_entries(scenarios, "prop_minRam")
+        self._check_prop_entries(scenarios, "prop_minDisk")
+        self._check_resource_entries(scenarios, "inv_res")