diff --git a/etc/tempest.conf.sample b/etc/tempest.conf.sample
index ee2da40..e46b813 100644
--- a/etc/tempest.conf.sample
+++ b/etc/tempest.conf.sample
@@ -548,6 +548,16 @@
 #ssh_user_regex=[["^.*[Cc]irros.*$", "root"]]
 
 
+[negative]
+
+#
+# Options defined in tempest.config
+#
+
+# Test generator class for all negative tests (string value)
+#test_generator=tempest.common.generator.negative_generator.NegativeTestGenerator
+
+
 [network]
 
 #
diff --git a/tempest/common/generate_json.py b/tempest/common/generate_json.py
deleted file mode 100644
index c8e86dc..0000000
--- a/tempest/common/generate_json.py
+++ /dev/null
@@ -1,265 +0,0 @@
-# Copyright 2014 Red Hat, Inc. & 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 copy
-import jsonschema
-
-from tempest.openstack.common import log as logging
-
-LOG = logging.getLogger(__name__)
-
-
-def generate_valid(schema):
-    """
-    Create a valid dictionary based on the types in a json schema.
-    """
-    LOG.debug("generate_valid: %s" % schema)
-    schema_type = schema["type"]
-    if isinstance(schema_type, list):
-        # Just choose the first one since all are valid.
-        schema_type = schema_type[0]
-    return type_map_valid[schema_type](schema)
-
-
-def generate_valid_string(schema):
-    size = schema.get("minLength", 0)
-    # TODO(dkr mko): handle format and pattern
-    return "x" * size
-
-
-def generate_valid_integer(schema):
-    # TODO(dkr mko): handle multipleOf
-    if "minimum" in schema:
-        minimum = schema["minimum"]
-        if "exclusiveMinimum" not in schema:
-            return minimum
-        else:
-            return minimum + 1
-    if "maximum" in schema:
-        maximum = schema["maximum"]
-        if "exclusiveMaximum" not in schema:
-            return maximum
-        else:
-            return maximum - 1
-    return 0
-
-
-def generate_valid_object(schema):
-    obj = {}
-    for k, v in schema["properties"].iteritems():
-        obj[k] = generate_valid(v)
-    return obj
-
-
-def generate_invalid(schema):
-    """
-    Generate an invalid json dictionary based on a schema.
-    Only one value is mis-generated for each dictionary created.
-
-    Any generator must return a list of tuples or a single tuple.
-    The values of this tuple are:
-      result[0]: Name of the test
-      result[1]: json schema for the test
-      result[2]: expected result of the test (can be None)
-    """
-    LOG.debug("generate_invalid: %s" % schema)
-    schema_type = schema["type"]
-    if isinstance(schema_type, list):
-        if "integer" in schema_type:
-            schema_type = "integer"
-        else:
-            raise Exception("non-integer list types not supported")
-    result = []
-    for generator in type_map_invalid[schema_type]:
-        ret = generator(schema)
-        if ret is not None:
-            if isinstance(ret, list):
-                result.extend(ret)
-            elif isinstance(ret, tuple):
-                result.append(ret)
-            else:
-                raise Exception("generator (%s) returns invalid result"
-                                % generator)
-    LOG.debug("result: %s" % result)
-    return result
-
-
-def _check_for_expected_result(name, schema):
-    expected_result = None
-    if "results" in schema:
-        if name in schema["results"]:
-            expected_result = schema["results"][name]
-    return expected_result
-
-
-def generator(fn):
-    """
-    Decorator for simple generators that simply return one value
-    """
-    def wrapped(schema):
-        result = fn(schema)
-        if result is not None:
-            expected_result = _check_for_expected_result(fn.__name__, schema)
-            return (fn.__name__, result, expected_result)
-        return
-    return wrapped
-
-
-@generator
-def gen_int(_):
-    return 4
-
-
-@generator
-def gen_string(_):
-    return "XXXXXX"
-
-
-def gen_none(schema):
-    # Note(mkoderer): it's not using the decorator otherwise it'd be filtered
-    expected_result = _check_for_expected_result('gen_none', schema)
-    return ('gen_none', None, expected_result)
-
-
-@generator
-def gen_str_min_length(schema):
-    min_length = schema.get("minLength", 0)
-    if min_length > 0:
-        return "x" * (min_length - 1)
-
-
-@generator
-def gen_str_max_length(schema):
-    max_length = schema.get("maxLength", -1)
-    if max_length > -1:
-        return "x" * (max_length + 1)
-
-
-@generator
-def gen_int_min(schema):
-    if "minimum" in schema:
-        minimum = schema["minimum"]
-        if "exclusiveMinimum" not in schema:
-            minimum -= 1
-        return minimum
-
-
-@generator
-def gen_int_max(schema):
-    if "maximum" in schema:
-        maximum = schema["maximum"]
-        if "exclusiveMaximum" not in schema:
-            maximum += 1
-        return maximum
-
-
-def gen_obj_remove_attr(schema):
-    invalids = []
-    valid = generate_valid(schema)
-    required = schema.get("required", [])
-    for r in required:
-        new_valid = copy.deepcopy(valid)
-        del new_valid[r]
-        invalids.append(("gen_obj_remove_attr", new_valid, None))
-    return invalids
-
-
-@generator
-def gen_obj_add_attr(schema):
-    valid = generate_valid(schema)
-    if not schema.get("additionalProperties", True):
-        new_valid = copy.deepcopy(valid)
-        new_valid["$$$$$$$$$$"] = "xxx"
-        return new_valid
-
-
-def gen_inv_prop_obj(schema):
-    LOG.debug("generate_invalid_object: %s" % schema)
-    valid = generate_valid(schema)
-    invalids = []
-    properties = schema["properties"]
-
-    for k, v in properties.iteritems():
-        for invalid in generate_invalid(v):
-            LOG.debug(v)
-            new_valid = copy.deepcopy(valid)
-            new_valid[k] = invalid[1]
-            name = "prop_%s_%s" % (k, invalid[0])
-            invalids.append((name, new_valid, invalid[2]))
-
-    LOG.debug("generate_invalid_object return: %s" % invalids)
-    return invalids
-
-
-type_map_valid = {
-    "string": generate_valid_string,
-    "integer": generate_valid_integer,
-    "object": generate_valid_object
-}
-
-type_map_invalid = {
-    "string": [
-        gen_int,
-        gen_none,
-        gen_str_min_length,
-        gen_str_max_length],
-    "integer": [
-        gen_string,
-        gen_none,
-        gen_int_min,
-        gen_int_max],
-    "object": [
-        gen_obj_remove_attr,
-        gen_obj_add_attr,
-        gen_inv_prop_obj]
-}
-
-schema = {
-    "type": "object",
-    "properties": {
-        "name": {"type": "string"},
-        "http-method": {
-            "enum": ["GET", "PUT", "HEAD",
-                     "POST", "PATCH", "DELETE", 'COPY']
-        },
-        "url": {"type": "string"},
-        "json-schema": jsonschema._utils.load_schema("draft4"),
-        "resources": {
-            "type": "array",
-            "items": {
-                "oneOf": [
-                    {"type": "string"},
-                    {
-                        "type": "object",
-                        "properties": {
-                            "name": {"type": "string"},
-                            "expected_result": {"type": "integer"}
-                        }
-                    }
-                ]
-            }
-        },
-        "results": {
-            "type": "object",
-            "properties": {}
-        }
-    },
-    "required": ["name", "http-method", "url"],
-    "additionalProperties": False,
-}
-
-
-def validate_negative_test_schema(nts):
-    jsonschema.validate(nts, schema)
diff --git a/tempest/common/generator/__init__.py b/tempest/common/generator/__init__.py
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/tempest/common/generator/__init__.py
diff --git a/tempest/common/generator/base_generator.py b/tempest/common/generator/base_generator.py
new file mode 100644
index 0000000..35f8158
--- /dev/null
+++ b/tempest/common/generator/base_generator.py
@@ -0,0 +1,141 @@
+# 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 jsonschema
+
+from tempest.openstack.common import log as logging
+
+LOG = logging.getLogger(__name__)
+
+
+def _check_for_expected_result(name, schema):
+    expected_result = None
+    if "results" in schema:
+        if name in schema["results"]:
+            expected_result = schema["results"][name]
+    return expected_result
+
+
+def generator_type(*args):
+    def wrapper(func):
+        func.types = args
+        return func
+    return wrapper
+
+
+def simple_generator(fn):
+    """
+    Decorator for simple generators that return one value
+    """
+    def wrapped(self, schema):
+        result = fn(self, schema)
+        if result is not None:
+            expected_result = _check_for_expected_result(fn.__name__, schema)
+            return (fn.__name__, result, expected_result)
+        return
+    return wrapped
+
+
+class BasicGeneratorSet(object):
+    _instance = None
+
+    schema = {
+        "type": "object",
+        "properties": {
+            "name": {"type": "string"},
+            "http-method": {
+                "enum": ["GET", "PUT", "HEAD",
+                         "POST", "PATCH", "DELETE", 'COPY']
+            },
+            "url": {"type": "string"},
+            "json-schema": jsonschema._utils.load_schema("draft4"),
+            "resources": {
+                "type": "array",
+                "items": {
+                    "oneOf": [
+                        {"type": "string"},
+                        {
+                            "type": "object",
+                            "properties": {
+                                "name": {"type": "string"},
+                                "expected_result": {"type": "integer"}
+                            }
+                        }
+                    ]
+                }
+            },
+            "results": {
+                "type": "object",
+                "properties": {}
+            }
+        },
+        "required": ["name", "http-method", "url"],
+        "additionalProperties": False,
+    }
+
+    def __new__(cls, *args, **kwargs):
+        if not cls._instance:
+            cls._instance = super(BasicGeneratorSet, cls).__new__(cls, *args,
+                                                                  **kwargs)
+        return cls._instance
+
+    def __init__(self):
+        self.types_dict = {}
+        for m in dir(self):
+            if callable(getattr(self, m)) and not'__' in m:
+                method = getattr(self, m)
+                if hasattr(method, "types"):
+                    for type in method.types:
+                        if type not in self.types_dict:
+                            self.types_dict[type] = []
+                        self.types_dict[type].append(method)
+
+    def validate_schema(self, schema):
+        jsonschema.validate(schema, self.schema)
+
+    def generate(self, schema):
+        """
+        Generate an json dictionary based on a schema.
+        Only one value is mis-generated for each dictionary created.
+
+        Any generator must return a list of tuples or a single tuple.
+        The values of this tuple are:
+          result[0]: Name of the test
+          result[1]: json schema for the test
+          result[2]: expected result of the test (can be None)
+        """
+        LOG.debug("generate_invalid: %s" % schema)
+        schema_type = schema["type"]
+        if isinstance(schema_type, list):
+            if "integer" in schema_type:
+                schema_type = "integer"
+            else:
+                raise Exception("non-integer list types not supported")
+        result = []
+        if schema_type not in self.types_dict:
+            raise Exception("generator (%s) doesn't support type: %s"
+                            % (self.__class__.__name__, schema_type))
+        for generator in self.types_dict[schema_type]:
+            ret = generator(schema)
+            if ret is not None:
+                if isinstance(ret, list):
+                    result.extend(ret)
+                elif isinstance(ret, tuple):
+                    result.append(ret)
+                else:
+                    raise Exception("generator (%s) returns invalid result: %s"
+                                    % (generator, ret))
+        LOG.debug("result: %s" % result)
+        return result
diff --git a/tempest/common/generator/negative_generator.py b/tempest/common/generator/negative_generator.py
new file mode 100644
index 0000000..4f3d2cd
--- /dev/null
+++ b/tempest/common/generator/negative_generator.py
@@ -0,0 +1,111 @@
+# 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 copy
+
+import tempest.common.generator.base_generator as base
+import tempest.common.generator.valid_generator as valid
+from tempest.openstack.common import log as logging
+
+LOG = logging.getLogger(__name__)
+
+
+class NegativeTestGenerator(base.BasicGeneratorSet):
+    @base.generator_type("string")
+    @base.simple_generator
+    def gen_int(self, _):
+        return 4
+
+    @base.generator_type("integer")
+    @base.simple_generator
+    def gen_string(self, _):
+        return "XXXXXX"
+
+    @base.generator_type("integer", "string")
+    def gen_none(self, schema):
+        # Note(mkoderer): it's not using the decorator otherwise it'd be
+        # filtered
+        expected_result = base._check_for_expected_result('gen_none', schema)
+        return ('gen_none', None, expected_result)
+
+    @base.generator_type("string")
+    @base.simple_generator
+    def gen_str_min_length(self, schema):
+        min_length = schema.get("minLength", 0)
+        if min_length > 0:
+            return "x" * (min_length - 1)
+
+    @base.generator_type("string")
+    @base.simple_generator
+    def gen_str_max_length(self, schema):
+        max_length = schema.get("maxLength", -1)
+        if max_length > -1:
+            return "x" * (max_length + 1)
+
+    @base.generator_type("integer")
+    @base.simple_generator
+    def gen_int_min(self, schema):
+        if "minimum" in schema:
+            minimum = schema["minimum"]
+            if "exclusiveMinimum" not in schema:
+                minimum -= 1
+            return minimum
+
+    @base.generator_type("integer")
+    @base.simple_generator
+    def gen_int_max(self, schema):
+        if "maximum" in schema:
+            maximum = schema["maximum"]
+            if "exclusiveMaximum" not in schema:
+                maximum += 1
+            return maximum
+
+    @base.generator_type("object")
+    def gen_obj_remove_attr(self, schema):
+        invalids = []
+        valid_schema = valid.ValidTestGenerator().generate_valid(schema)
+        required = schema.get("required", [])
+        for r in required:
+            new_valid = copy.deepcopy(valid_schema)
+            del new_valid[r]
+            invalids.append(("gen_obj_remove_attr", new_valid, None))
+        return invalids
+
+    @base.generator_type("object")
+    @base.simple_generator
+    def gen_obj_add_attr(self, schema):
+        valid_schema = valid.ValidTestGenerator().generate_valid(schema)
+        if not schema.get("additionalProperties", True):
+            new_valid = copy.deepcopy(valid_schema)
+            new_valid["$$$$$$$$$$"] = "xxx"
+            return new_valid
+
+    @base.generator_type("object")
+    def gen_inv_prop_obj(self, schema):
+        LOG.debug("generate_invalid_object: %s" % schema)
+        valid_schema = valid.ValidTestGenerator().generate_valid(schema)
+        invalids = []
+        properties = schema["properties"]
+
+        for k, v in properties.iteritems():
+            for invalid in self.generate(v):
+                LOG.debug(v)
+                new_valid = copy.deepcopy(valid_schema)
+                new_valid[k] = invalid[1]
+                name = "prop_%s_%s" % (k, invalid[0])
+                invalids.append((name, new_valid, invalid[2]))
+
+        LOG.debug("generate_invalid_object return: %s" % invalids)
+        return invalids
diff --git a/tempest/common/generator/valid_generator.py b/tempest/common/generator/valid_generator.py
new file mode 100644
index 0000000..a99bbc0
--- /dev/null
+++ b/tempest/common/generator/valid_generator.py
@@ -0,0 +1,58 @@
+# 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 tempest.common.generator.base_generator as base
+from tempest.openstack.common import log as logging
+
+
+LOG = logging.getLogger(__name__)
+
+
+class ValidTestGenerator(base.BasicGeneratorSet):
+    @base.generator_type("string")
+    @base.simple_generator
+    def generate_valid_string(self, schema):
+        size = schema.get("minLength", 0)
+        # TODO(dkr mko): handle format and pattern
+        return "x" * size
+
+    @base.generator_type("integer")
+    @base.simple_generator
+    def generate_valid_integer(self, schema):
+        # TODO(dkr mko): handle multipleOf
+        if "minimum" in schema:
+            minimum = schema["minimum"]
+            if "exclusiveMinimum" not in schema:
+                return minimum
+            else:
+                return minimum + 1
+        if "maximum" in schema:
+            maximum = schema["maximum"]
+            if "exclusiveMaximum" not in schema:
+                return maximum
+            else:
+                return maximum - 1
+        return 0
+
+    @base.generator_type("object")
+    @base.simple_generator
+    def generate_valid_object(self, schema):
+        obj = {}
+        for k, v in schema["properties"].iteritems():
+            obj[k] = self.generate_valid(v)
+        return obj
+
+    def generate_valid(self, schema):
+        return self.generate(schema)[0][1]
diff --git a/tempest/config.py b/tempest/config.py
index 0f5e23c..26b3bf1 100644
--- a/tempest/config.py
+++ b/tempest/config.py
@@ -806,6 +806,15 @@
                help="Number of seconds to wait on a CLI timeout"),
 ]
 
+negative_group = cfg.OptGroup(name='negative', title="Negative Test Options")
+
+NegativeGroup = [
+    cfg.StrOpt('test_generator',
+               default='tempest.common.' +
+               'generator.negative_generator.NegativeTestGenerator',
+               help="Test generator class for all negative tests"),
+]
+
 
 def register_opts():
     register_opt_group(cfg.CONF, compute_group, ComputeGroup)
@@ -840,6 +849,7 @@
     register_opt_group(cfg.CONF, baremetal_group, BaremetalGroup)
     register_opt_group(cfg.CONF, input_scenario_group, InputScenarioGroup)
     register_opt_group(cfg.CONF, cli_group, CLIGroup)
+    register_opt_group(cfg.CONF, negative_group, NegativeGroup)
 
 
 # this should never be called outside of this class
@@ -879,6 +889,7 @@
         self.baremetal = cfg.CONF.baremetal
         self.input_scenario = cfg.CONF['input-scenario']
         self.cli = cfg.CONF.cli
+        self.negative = cfg.CONF.negative
         if not self.compute_admin.username:
             self.compute_admin.username = self.identity.admin_username
             self.compute_admin.password = self.identity.admin_password
diff --git a/tempest/test.py b/tempest/test.py
index c6e3d6e..2125047 100644
--- a/tempest/test.py
+++ b/tempest/test.py
@@ -27,10 +27,11 @@
 import testtools
 
 from tempest import clients
-from tempest.common import generate_json
+import tempest.common.generator.valid_generator as valid
 from tempest.common import isolated_creds
 from tempest import config
 from tempest import exceptions
+from tempest.openstack.common import importutils
 from tempest.openstack.common import log as logging
 
 LOG = logging.getLogger(__name__)
@@ -400,7 +401,8 @@
         """
         description = NegativeAutoTest.load_schema(description_file)
         LOG.debug(description)
-        generate_json.validate_negative_test_schema(description)
+        generator = importutils.import_class(CONF.negative.test_generator)()
+        generator.validate_schema(description)
         schema = description.get("json-schema", None)
         resources = description.get("resources", [])
         scenario_list = []
@@ -416,7 +418,7 @@
                                              "expected_result": expected_result
                                              }))
         if schema is not None:
-            for invalid in generate_json.generate_invalid(schema):
+            for invalid in generator.generate(schema):
                 scenario_list.append((invalid[0],
                                       {"schema": invalid[1],
                                        "expected_result": invalid[2]}))
@@ -459,11 +461,12 @@
             # Note(mkoderer): The resources list already contains an invalid
             # entry (see get_resource).
             # We just send a valid json-schema with it
-            valid = None
+            valid_schema = None
             schema = description.get("json-schema", None)
             if schema:
-                valid = generate_json.generate_valid(schema)
-            new_url, body = self._http_arguments(valid, url, method)
+                valid_schema = \
+                    valid.ValidTestGenerator().generate_valid(schema)
+            new_url, body = self._http_arguments(valid_schema, url, method)
         elif hasattr(self, "schema"):
             new_url, body = self._http_arguments(self.schema, url, method)
 
diff --git a/tempest/tests/fake_config.py b/tempest/tests/fake_config.py
index 41b0558..e941606 100644
--- a/tempest/tests/fake_config.py
+++ b/tempest/tests/fake_config.py
@@ -43,6 +43,10 @@
         swift = True
         horizon = True
 
+    class fake_negative(object):
+        test_generator = 'tempest.common.' \
+            'generator.negative_generator.NegativeTestGenerator'
+
     compute_feature_enabled = fake_compute_feature_enabled()
     volume_feature_enabled = fake_default_feature_enabled()
     network_feature_enabled = fake_default_feature_enabled()
@@ -52,3 +56,5 @@
 
     compute = fake_compute()
     identity = fake_identity()
+
+    negative = fake_negative()
diff --git a/tempest/tests/negative/test_generate_json.py b/tempest/tests/negative/test_generate_json.py
index a0aa088..e09fcdf 100644
--- a/tempest/tests/negative/test_generate_json.py
+++ b/tempest/tests/negative/test_generate_json.py
@@ -13,11 +13,11 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-from tempest.common import generate_json as gen
+from tempest.common.generator import negative_generator
 import tempest.test
 
 
-class TestGenerateJson(tempest.test.BaseTestCase):
+class TestNegativeGenerator(tempest.test.BaseTestCase):
 
     fake_input_str = {"type": "string",
                       "minLength": 2,
@@ -35,19 +35,23 @@
                                      }
                       }
 
+    def setUp(self):
+        super(TestNegativeGenerator, self).setUp()
+        self.negative = negative_generator.NegativeTestGenerator()
+
     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)
+        result = self.negative.generate(self.fake_input_str)
         self._validate_result(result)
 
     def test_generate_invalid_integer(self):
-        result = gen.generate_invalid(self.fake_input_int)
+        result = self.negative.generate(self.fake_input_int)
         self._validate_result(result)
 
     def test_generate_invalid_obj(self):
-        result = gen.generate_invalid(self.fake_input_obj)
+        result = self.negative.generate(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
index 4c59383..27ddc95 100644
--- a/tempest/tests/negative/test_negative_auto_test.py
+++ b/tempest/tests/negative/test_negative_auto_test.py
@@ -16,9 +16,11 @@
 import mock
 
 import tempest.test as test
+from tempest.tests import base
+from tempest.tests import fake_config
 
 
-class TestNegativeAutoTest(test.BaseTestCase):
+class TestNegativeAutoTest(base.TestCase):
     # Fake entries
     _interface = 'json'
     _service = 'compute'
@@ -34,6 +36,10 @@
                        "resources": ["flavor", "volume", "image"]
                        }
 
+    def setUp(self):
+        super(TestNegativeAutoTest, self).setUp()
+        self.stubs.Set(test, 'CONF', fake_config.FakeConfig)
+
     def _check_prop_entries(self, result, entry):
         entries = [a for a in result if entry in a[0]]
         self.assertIsNotNone(entries)