Feature/nat 286 create unit tests for netbox client

test/services/fixtures/device.json

-{
-    "id": 1,
-    "name": "test1-edge1",
-    "display_name": "test1-edge1",
-    "device_type": {
-        "id": 1,
-        "url": "http://localhost:8000/api/dcim/device-types/1/",
-        "manufacturer": {
-            "id": 1,
-            "url": "http://localhost:8000/api/dcim/manufacturers/1/",
-            "name": "Juniper",
-            "slug": "juniper"
-        },
-        "model": "MX960",
-        "slug": "mx960"
-    },
-    "role": {
-        "id": 1,
-        "url": "http://localhost:8000/api/dcim/device-roles/1/",
-        "name": "Router",
-        "slug": "router"
-    },
-    "tenant": null,
-    "platform": {
-        "id": 1,
-        "url": "http://localhost:8000/api/dcim/platforms/1/",
-        "name": "Juniper Junos",
-        "slug": "juniper-junos"
-    },
-    "serial": "5555555555",
-    "asset_tag": null,
-    "site": {
-        "id": 1,
-        "url": "http://localhost:8000/api/dcim/sites/1/",
-        "name": "TEST1",
-        "slug": "test1"
-    },
-    "rack": {
-        "id": 1,
-        "url": "http://localhost:8000/api/dcim/racks/1/",
-        "name": "A1R1",
-        "display_name": "A1R1 (T23A01)"
-    },
-    "position": 1,
-    "face": {
-        "value": 0,
-        "label": "Front"
-    },
-    "parent_device": null,
-    "status": {
-        "value": true,
-        "label": "Active"
-    },
-    "primary_ip": {
-        "id": 1,
-        "url": "http://localhost:8000/api/ipam/ip-addresses/1/",
-        "family": 4,
-        "address": "10.0.255.1/32"
-    },
-    "primary_ip4": {
-        "id": 1,
-        "url": "http://localhost:8000/api/ipam/ip-addresses/1/",
-        "family": 4,
-        "address": "10.0.255.1/32"
-    },
-    "primary_ip6": null,
-    "comments": "",
-    "local_context_data": {
-        "testing": "test"
-    },
-    "custom_fields": {},
-    "config_context": {
-        "test_key": "test_val"
-    }
-}