diff --git a/.coveragerc b/.coveragerc
index c35bfbc..ac30c60 100644
--- a/.coveragerc
+++ b/.coveragerc
@@ -6,6 +6,7 @@
     *__main__*
     gstack/models/*.py
     gstack/configure.py
+    gstack/core.py
 
 [report]
 exclude_lines =
diff --git a/gstack/controllers/disks.py b/gstack/controllers/disks.py
index 16a1a0c..4ce196e 100644
--- a/gstack/controllers/disks.py
+++ b/gstack/controllers/disks.py
@@ -42,11 +42,7 @@
         machinetype=cloudstack_response['name'],
         zone=zone
     ))
-
-    if not zone:
-        response['zone'] = cloudstack_response['zonename']
-    else:
-        response['zone'] = zone
+    response['zone'] = zone
 
     return response
 
@@ -55,9 +51,10 @@
 @authentication.required
 def aggregatedlistdisks(projectid, authorization):
     args = {'command':'listVolumes'}
+    kwargs = {'projectid':projectid}
     items = controllers.describe_items_aggregated(
-        authorization, args, 'volume',
-        projectid, _cloudstack_volume_to_gce)
+        authorization, args, 'volume', 'disk',
+        _cloudstack_volume_to_gce, **kwargs)
 
     populated_response = {
         'kind': 'compute#diskAggregatedList',
@@ -73,9 +70,10 @@
 @authentication.required
 def listdisks(projectid, authorization, zone):
     args = {'command':'listVolumes'}
+    kwargs = {'projectid':projectid, 'zone':zone}
     items = controllers.describe_items(
         authorization, args, 'volume',
-        projectid, zone, _cloudstack_volume_to_gce)
+        _cloudstack_volume_to_gce, **kwargs)
 
     populated_response = {
         'kind': 'compute#imageList',
@@ -90,24 +88,9 @@
 @app.route('/compute/v1/projects/<projectid>/zones/<zone>/disks/<disk>', methods=['GET'])
 @authentication.required
 def getdisk(projectid, authorization, zone, disk):
-    response = get_disk_by_name(
-        authorization=authorization,
-        disk=disk
-    )
-
-    if response:
-        return helpers.create_response(
-            data=_cloudstack_volume_to_gce(
-                cloudstack_response=response,
-                projectid=projectid,
-                zone=zone
-            )
-        )
-    else:
-        func_route = url_for(
-            'getdisk',
-            projectid=projectid,
-            zone=zone,
-            disk=disk
-        )
-        return errors.resource_not_found(func_route)
+    func_route = url_for('getdisk', projectid=projectid, zone=zone, disk=disk)
+    args = {'command':'listVolumes'}
+    kwargs = {'projectid':projectid, 'zone':zone}
+    return controllers.get_item_with_name_or_error(
+        authorization, disk, args, 'volume', func_route,
+        _cloudstack_volume_to_gce, **kwargs)
diff --git a/gstack/controllers/images.py b/gstack/controllers/images.py
index 6f5d226..49ab9ff 100755
--- a/gstack/controllers/images.py
+++ b/gstack/controllers/images.py
@@ -25,10 +25,15 @@
 from gstack.controllers import errors
 from flask import request, url_for
 
+def get_template_by_name(authorization, image):
+    args = {'templatefilter': 'executable', 'command':'listTemplates'}
+    return controllers.get_item_with_name(authorization, image, args, 'template')
+
 
 def _create_populated_image_response(projectid, images=None):
     if not images:
         images = []
+
     populated_response = {
         'kind': 'compute#imageList',
         'selfLink': request.base_url,
@@ -84,15 +89,8 @@
 @app.route('/compute/v1/projects/<projectid>/global/images/<image>', methods=['GET'])
 @authentication.required
 def getimage(projectid, authorization, image):
-    response = get_template_by_name(
-        authorization=authorization,
-        image=image
-    )
-
-    if response:
-        return helpers.create_response(
-            data=_cloudstack_template_to_gce(response)
-        )
-    else:
-        func_route = url_for('getimage', projectid=projectid, image=image)
-        return errors.resource_not_found(func_route)
\ No newline at end of file
+    func_route = url_for('getimage', projectid=projectid, image=image)
+    args = {'templatefilter': 'executable', 'command':'listTemplates'}
+    return controllers.get_item_with_name_or_error(
+        authorization, image, args, 'template', func_route,
+        _cloudstack_template_to_gce, **{})
\ No newline at end of file
diff --git a/gstack/controllers/instances.py b/gstack/controllers/instances.py
index b11eadb..4b9d22f 100755
--- a/gstack/controllers/instances.py
+++ b/gstack/controllers/instances.py
@@ -70,26 +70,6 @@
     return cloudstack_response
 
 
-def _destroy_virtual_machine(authorization, instance):
-    virtual_machine_id = _get_virtual_machine_by_name(
-        authorization,
-        instance)['id']
-
-    if virtual_machine_id is None:
-        func_route = url_for('_destroy_virtual_machine', instance=instance)
-        return errors.resource_not_found(func_route)
-
-    args = {
-        'id': virtual_machine_id
-    }
-    return requester.make_request(
-        'destroyVirtualMachine',
-        args,
-        authorization.client_id,
-        authorization.client_secret
-    )
-
-
 def _cloudstack_virtual_machine_to_gce(cloudstack_response, projectid, zone, **kwargs):
     response = {}
     response['kind'] = 'compute#instance'
@@ -170,16 +150,6 @@
     return helpers.create_response(data=populated_response)
 
 
-@app.route('/compute/v1/projects/<projectid>/zones/<zone>/instances/<instance>', methods=['GET'])
-@authentication.required
-def getinstance(projectid, authorization, zone, instance):
-    func_route = url_for('getinstance', projectid=projectid, zone=zone, instance=instance)
-    args = {'command':'listVirtualMachines'}
-    return controllers.get_item_with_name_or_error(
-        authorization, instance, args, 'zone', func_route,
-        _cloudstack_zone_to_gce, **{'projectid':projectid})
-
-
 @app.route('/compute/v1/projects/<projectid>/zones/<zone>/instances', methods=['POST'])
 @authentication.required
 def addinstance(authorization, projectid, zone):
@@ -224,7 +194,21 @@
 @app.route('/compute/v1/projects/<projectid>/zones/<zone>/instances/<instance>', methods=['DELETE'])
 @authentication.required
 def deleteinstance(projectid, authorization, zone, instance):
-    deletion_result = _destroy_virtual_machine(authorization, instance)
+    args = {'command':'listVirtualMachines'}
+    virtual_machine = controllers.get_item_with_name(authorization, instance, args, 'virtualmachine')
+    if virtual_machine is None:
+        func_route = url_for('deleteinstance', projectid=projectid, zone=zone, instance=instance)
+        return errors.resource_not_found(func_route)
+
+    virtual_machine_id = virtual_machine['id']
+    args = {'id': virtual_machine_id}
+
+    deletion_result = requester.make_request(
+        'destroyVirtualMachine',
+        args,
+        authorization.client_id,
+        authorization.client_secret
+    )
 
     populated_response = operations.create_response(
         projectid=projectid,
@@ -232,4 +216,14 @@
         authorization=authorization
     )
 
-    return helpers.create_response(data=populated_response)
\ No newline at end of file
+    return helpers.create_response(data=populated_response)
+
+@app.route('/compute/v1/projects/<projectid>/zones/<zone>/instances/<instance>', methods=['GET'])
+@authentication.required
+def getinstance(projectid, authorization, zone, instance):
+    func_route = url_for('getinstance', projectid=projectid, zone=zone, instance=instance)
+    args = {'command':'listVirtualMachines'}
+    kwargs = {'projectid':projectid, 'zone':zone}
+    return controllers.get_item_with_name_or_error(
+        authorization, instance, args, 'virtualmachine', func_route,
+        _cloudstack_virtual_machine_to_gce, **kwargs)
\ No newline at end of file
diff --git a/gstack/controllers/machine_type.py b/gstack/controllers/machine_type.py
index 719d9a4..202a86e 100755
--- a/gstack/controllers/machine_type.py
+++ b/gstack/controllers/machine_type.py
@@ -25,6 +25,10 @@
 from gstack.controllers import errors, zones
 from flask import request, url_for
 
+def get_machinetype_by_name(authorization, machinetype):
+    args = {'command':'listServiceOfferings'}
+    return controllers.get_item_with_name(authorization, machinetype, args, 'serviceoffering')
+
 
 def _cloudstack_service_offering_to_gce(cloudstack_response, projectid, zone):
     response = {}
diff --git a/gstack/controllers/networks.py b/gstack/controllers/networks.py
index e101fd6..5932de1 100644
--- a/gstack/controllers/networks.py
+++ b/gstack/controllers/networks.py
@@ -26,6 +26,10 @@
 from gstack.services import requester
 from gstack.controllers import errors
 
+def get_network_by_name(authorization, network):
+    args = {'command':'SecurityGroups'}
+    return controllers.get_item_with_name(authorization, network, args, 'securitygroup')
+
 def _add_network(authorization, args=None):
     command = 'createSecurityGroup'
     if not args:
diff --git a/gstack/controllers/zones.py b/gstack/controllers/zones.py
index e515777..213ec50 100755
--- a/gstack/controllers/zones.py
+++ b/gstack/controllers/zones.py
@@ -24,6 +24,10 @@
 from gstack.services import requester
 from gstack.controllers import errors
 
+def get_zone_by_name(authorization, zone):
+    args = {'command':'listZones'}
+    return controllers.get_item_with_name(authorization, zone, args, 'zone')
+
 
 def _get_zones(authorization, args=None):
     command = 'listZones'
@@ -42,8 +46,6 @@
 def get_zone_names(authorization):
     zone_list = _get_zones(authorization)
 
-    print zone_list
-
     zones = []
     if zone_list['listzonesresponse']:
         for zone in zone_list['listzonesresponse']['zone']:
diff --git a/tests/data/valid_get_image.json b/tests/data/valid_get_image.json
new file mode 100644
index 0000000..3348483
--- /dev/null
+++ b/tests/data/valid_get_image.json
@@ -0,0 +1,28 @@
+{
+    "domain": "ROOT",
+    "domainid": "2edae3e4-95e4-11e3-b2e4-d19c9d3e5e1d",
+    "ostypename": "CentOS 5.3 (32-bit)",
+    "zoneid": "1e47a2fc-61c7-401c-b90e-416b472ada64",
+    "displaytext": "CentOS 5.3(64-bit) no GUI (Simulator)",
+    "ostypeid": "2e678976-95e4-11e3-b2e4-d19c9d3e5e1d",
+    "passwordenabled": false,
+    "id": "a32d70ee-95e4-11e3-b2e4-d19c9d3e5e1d",
+    "size": 2147483648,
+    "isready": true,
+    "format": "VHD",
+    "templatetype": "BUILTIN",
+    "crosszones": true,
+    "zonename": "Sandbox-simulator",
+    "status": "Download Complete",
+    "isdynamicallyscalable": false,
+    "tags": [],
+    "isfeatured": true,
+    "sshkeyenabled": false,
+    "isextractable": false,
+    "account": "system",
+    "name": "imagename",
+    "created": "2014-02-15T02:50:13+0000",
+    "hypervisor": "Simulator",
+    "ispublic": true,
+    "checksum": ""
+}
\ No newline at end of file
diff --git a/tests/data/valid_get_instance.json b/tests/data/valid_get_instance.json
new file mode 100644
index 0000000..528cba4
--- /dev/null
+++ b/tests/data/valid_get_instance.json
@@ -0,0 +1,104 @@
+{
+                "domain": "brogand93@darrenbrogan.ie",
+                "domainid": "42f2b0d0-3953-485f-984d-b8d67185d358",
+                "haenable": false,
+                "templatename": "Linux CentOS 6.5 64-bit",
+                "securitygroup": [
+                    {
+                        "egressrule": [],
+                        "account": "brogand93@darrenbrogan.ie",
+                        "description": "Default Security Group",
+                        "tags": [],
+                        "ingressrule": [],
+                        "id": "6033ff41-53ff-4443-b0bb-f6c5c0191c34",
+                        "name": "default"
+                    }
+                ],
+                "zoneid": "1128bd56-b4d9-4ac6-a7b9-c715b187ce11",
+                "keypair": "brogand93@darrenbrogan.ie",
+                "cpunumber": 1,
+                "passwordenabled": true,
+                "id": "71f13c6d-1590-4e82-9cdd-22eb9bcad0db",
+                "displayvm": true,
+                "state": "Running",
+                "guestosid": "113038d0-a8cd-4d20-92be-ea313f87c3ac",
+                "memory": 1024,
+                "serviceofferingid": "b6cd1ff5-3a2f-4e9d-a4d1-8988c1191fe8",
+                "zonename": "ch-gva-2",
+                "isdynamicallyscalable": false,
+                "displayname": "foobar",
+                "tags": [
+                    {
+                        "account": "brogand93@darrenbrogan.ie",
+                        "domainid": "42f2b0d0-3953-485f-984d-b8d67185d358",
+                        "resourcetype": "UserVm",
+                        "resourceid": "71f13c6d-1590-4e82-9cdd-22eb9bcad0db",
+                        "domain": "brogand93@darrenbrogan.ie",
+                        "value": "root:ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQDqAuui+xCVPXaFD4cP2MuWnDlktg9vMT/SNzF17UiAzKEbxT/mNayTDAr",
+                        "key": "0-sshkey-segment"
+                    },
+                    {
+                        "account": "brogand93@darrenbrogan.ie",
+                        "domainid": "42f2b0d0-3953-485f-984d-b8d67185d358",
+                        "resourcetype": "UserVm",
+                        "resourceid": "71f13c6d-1590-4e82-9cdd-22eb9bcad0db",
+                        "domain": "brogand93@darrenbrogan.ie",
+                        "value": "DbY/BgGYC5bHuGlb/eE1r4EGpwSXZitGkTI4ThldrSp0Em7psO8AibdpYrFxlOmDFp9wKVD6xbY2HT1ySwvKi+ZwSR5yHcEKq15e",
+                        "key": "1-sshkey-segment"
+                    },
+                    {
+                        "account": "brogand93@darrenbrogan.ie",
+                        "domainid": "42f2b0d0-3953-485f-984d-b8d67185d358",
+                        "resourcetype": "UserVm",
+                        "resourceid": "71f13c6d-1590-4e82-9cdd-22eb9bcad0db",
+                        "domain": "brogand93@darrenbrogan.ie",
+                        "value": "V4eez/3qC1vIcssKmwu5+ZBneZAvWAfxHEKsQU0dsCVvHdn8g7tFXXtg4QCGtE4yzK5v3/+f1AdtIi4hvJoMyi8MV0KSa8e/ravd",
+                        "key": "2-sshkey-segment"
+                    },
+                    {
+                        "account": "brogand93@darrenbrogan.ie",
+                        "domainid": "42f2b0d0-3953-485f-984d-b8d67185d358",
+                        "resourcetype": "UserVm",
+                        "resourceid": "71f13c6d-1590-4e82-9cdd-22eb9bcad0db",
+                        "domain": "brogand93@darrenbrogan.ie",
+                        "value": "Hbgj44PncFBB8O6epVdXPbClZwtkz9D6GEQaOArxk9tX8YEgTFnmsnNuaoZgs7giMj2N7jQe2qXh5R0nsTTuH brogand@microv",
+                        "key": "3-sshkey-segment"
+                    },
+                    {
+                        "account": "brogand93@darrenbrogan.ie",
+                        "domainid": "42f2b0d0-3953-485f-984d-b8d67185d358",
+                        "resourcetype": "UserVm",
+                        "resourceid": "71f13c6d-1590-4e82-9cdd-22eb9bcad0db",
+                        "domain": "brogand93@darrenbrogan.ie",
+                        "value": "ac",
+                        "key": "4-sshkey-segment"
+                    }
+                ],
+                "nic": [
+                    {
+                        "networkid": "00304a04-c7ea-4e77-a786-18bc64347bf7",
+                        "macaddress": "06:b0:2e:00:01:04",
+                        "isolationuri": "ec2://untagged",
+                        "networkname": "guestNetworkForBasicZone",
+                        "gateway": "185.19.28.1",
+                        "traffictype": "Guest",
+                        "broadcasturi": "vlan://untagged",
+                        "netmask": "255.255.254.0",
+                        "type": "Shared",
+                        "ipaddress": "185.19.28.199",
+                        "id": "2b5cc781-d310-43cf-9d68-66719f43855d",
+                        "isdefault": true
+                    }
+                ],
+                "cpuspeed": 2198,
+                "templateid": "c34bf3f0-318b-4d77-b0ca-f20585d05d32",
+                "affinitygroup": [],
+                "account": "brogand93@darrenbrogan.ie",
+                "name": "instancename",
+                "created": "2014-06-02T21:11:52+0200",
+                "hypervisor": "KVM",
+                "rootdevicetype": "ROOT",
+                "rootdeviceid": 0,
+                "serviceofferingname": "Tiny",
+                "templatedisplaytext": "Linux CentOS 6.5 64-bit 10GB Disk"
+            }
\ No newline at end of file
diff --git a/tests/data/valid_get_service_offering.json b/tests/data/valid_get_service_offering.json
new file mode 100644
index 0000000..a5381c0
--- /dev/null
+++ b/tests/data/valid_get_service_offering.json
@@ -0,0 +1,16 @@
+{
+    "iscustomized": false,
+    "name": "machinetypename",
+    "created": "2013-02-08T17:20:17+0100",
+    "storagetype": "local",
+    "limitcpuuse": false,
+    "cpuspeed": 2198,
+    "offerha": false,
+    "isvolatile": false,
+    "cpunumber": 1,
+    "memory": 512,
+    "displaytext": "Micro 512mb 1cpu",
+    "issystem": false,
+    "id": "71004023-bb72-4a97-b1e9-bc66dfce9470",
+    "defaultuse": false
+}
\ No newline at end of file
diff --git a/tests/data/valid_get_zone.json b/tests/data/valid_get_zone.json
new file mode 100644
index 0000000..4f438e3
--- /dev/null
+++ b/tests/data/valid_get_zone.json
@@ -0,0 +1,10 @@
+{
+    "localstorageenabled": true,
+    "name": "zonename",
+    "zonetoken": "ccb0a60c-79c8-3230-ab8b-8bdbe8c45bb7",
+    "securitygroupsenabled": true,
+    "allocationstate": "Enabled",
+    "dhcpprovider": "VirtualRouter",
+    "networktype": "Basic",
+    "id": "1128bd56-b4d9-4ac6-a7b9-c715b187ce11"
+}
\ No newline at end of file
diff --git a/tests/instances_tests.py b/tests/instances_tests.py
index 9420adc..4278caa 100644
--- a/tests/instances_tests.py
+++ b/tests/instances_tests.py
@@ -11,7 +11,6 @@
 class InstancesTestCase(GStackAppTestCase):
 
     def test_list_instances(self):
-
         get = mock.Mock()
         get.return_value.text = read_file('tests/data/valid_describe_instances.json')
         get.return_value.status_code = 200
@@ -23,7 +22,6 @@
         self.assert_ok(response)
 
     def test_aggregated_list_instances(self):
-
         get = mock.Mock()
         get.return_value.text = read_file('tests/data/valid_describe_instances.json')
         get.return_value.status_code = 200
@@ -42,7 +40,6 @@
         self.assert_ok(response)
 
     def test_list_instances_with_name_filter(self):
-
         get = mock.Mock()
         get.return_value.text = read_file('tests/data/valid_describe_instance.json')
         get.return_value.status_code = 200
@@ -56,7 +53,6 @@
         self.assert_ok(response)
 
     def test_aggregated_list_instances_with_name_filter(self):
-
         get = mock.Mock()
         get.return_value.text = read_file('tests/data/valid_describe_instance.json')
         get.return_value.status_code = 200
@@ -77,7 +73,6 @@
         self.assert_ok(response)
 
     def test_get_instance(self):
-
         get = mock.Mock()
         get.return_value.text = read_file('tests/data/valid_describe_instance.json')
         get.return_value.status_code = 200
@@ -89,7 +84,6 @@
         self.assert_ok(response)
 
     def test_get_instance_instance_not_found(self):
-
         get = mock.Mock()
         get.return_value.text = read_file('tests/data/empty_describe_instances.json')
         get.return_value.status_code = 200
@@ -103,13 +97,12 @@
                 in response.data
 
     def test_delete_instance(self):
-
         get = mock.Mock()
         get.return_value.text = read_file('tests/data/valid_async_destroy_vm.json')
         get.return_value.status_code = 200
 
-        get_instance_id = mock.Mock()
-        get_instance_id.return_value = {'id':'virtualmachineid'}
+        get_instance = mock.Mock()
+        get_instance.return_value = json.loads(read_file('tests/data/valid_get_instance.json'))
 
         get_async_result = mock.Mock()
         get_async_result.return_value = json.loads(read_file('tests/data/valid_run_instance.json'))
@@ -118,8 +111,8 @@
 
         with mock.patch('requests.get', get):
             with mock.patch(
-                    'gstack.controllers.instances._get_virtual_machine_by_name',
-                    get_instance_id
+                    'gstack.controllers.get_item_with_name',
+                    get_instance
                 ):
                 with mock.patch(
                     'gstack.controllers.operations._get_async_result',
@@ -130,6 +123,33 @@
 
         self.assert_ok(response)
 
+    def test_delete_instance_instance_not_found(self):
+        get = mock.Mock()
+        get.return_value.text = read_file('tests/data/valid_async_destroy_vm.json')
+        get.return_value.status_code = 200
+
+        get_instance = mock.Mock()
+        get_instance.return_value = None
+
+        get_async_result = mock.Mock()
+        get_async_result.return_value = json.loads(read_file('tests/data/valid_run_instance.json'))
+
+        publickey_storage['admin'] = 'testkey'
+
+        with mock.patch('requests.get', get):
+            with mock.patch(
+                    'gstack.controllers.get_item_with_name',
+                    get_instance
+                ):
+                with mock.patch(
+                    'gstack.controllers.operations._get_async_result',
+                    get_async_result
+                ):
+                    headers = {'authorization': 'Bearer ' + str(GStackAppTestCase.access_token)}
+                    response = self.delete('/compute/v1/projects/admin/zones/examplezone/instances/instancename', headers=headers)
+
+        self.assert_not_found(response)
+
     def test_add_instance(self):
         data = {
              'kind':  'compte#instance',
@@ -172,35 +192,35 @@
         get.return_value.status_code = 200
 
         get_templates = mock.Mock()
-        get_templates.return_value = json.loads(read_file('tests/data/valid_describe_images.json'))
+        get_templates.return_value = json.loads(read_file('tests/data/valid_get_image.json'))
 
         get_zones = mock.Mock()
-        get_zones.return_value = json.loads(read_file('tests/data/valid_describe_zone.json'))
+        get_zones.return_value = json.loads(read_file('tests/data/valid_get_zone.json'))
 
         get_service_offerings = mock.Mock()
-        get_service_offerings.return_value = json.loads(read_file('tests/data/valid_describe_service_offering.json'))
+        get_service_offerings.return_value = json.loads(read_file('tests/data/valid_get_service_offering.json'))
 
         get_networks = mock.Mock()
-        get_networks.return_value = json.loads(read_file('tests/data/valid_describe_security_group.json'))
+        get_networks.return_value = json.loads(read_file('tests/data/valid_get_security_group.json'))
 
         get_async_result = mock.Mock()
         get_async_result.return_value = json.loads(read_file('tests/data/valid_run_instance.json'))
 
         with mock.patch('requests.get', get):
             with mock.patch(
-                'gstack.controllers.images._get_templates',
+                'gstack.controllers.images.get_template_by_name',
                 get_templates
             ):
                 with mock.patch(
-                    'gstack.controllers.zones._get_zones',
+                    'gstack.controllers.zones.get_zone_by_name',
                     get_zones
                 ):
                      with mock.patch(
-                        'gstack.controllers.machine_type._get_machinetypes',
+                        'gstack.controllers.machine_type.get_machinetype_by_name',
                         get_service_offerings
                     ):
                          with mock.patch(
-                            'gstack.controllers.networks._get_networks',
+                            'gstack.controllers.networks.get_network_by_name',
                             get_networks
                         ):
                             with mock.patch(
diff --git a/tests/networks_tests.py b/tests/networks_tests.py
index 452d3a8..d88aa82 100644
--- a/tests/networks_tests.py
+++ b/tests/networks_tests.py
@@ -100,7 +100,7 @@
         get.return_value.status_code = 200
 
         get_networks = mock.Mock()
-        get_networks.return_value = None
+        get_networks.return_value = json.loads(read_file('tests/data/valid_get_security_group.json'))
 
         with mock.patch('requests.get', get):
             with mock.patch('gstack.controllers.get_item_with_name', get_networks):
@@ -119,7 +119,7 @@
         get.return_value.status_code = 200
 
         get_networks = mock.Mock()
-        get_networks.return_value = json.loads(read_file('tests/data/valid_get_security_group.json'))
+        get_networks.return_value = None
 
         with mock.patch('requests.get', get):
             with mock.patch('gstack.controllers.get_item_with_name', get_networks):