Add unit tests for Extras model

tests/unit/test_extras.py

@@ -0,0 +1,40 @@
+import unittest
+
+import six
+
+from pynetbox.models.extras import ConfigContexts
+
+
+class ExtrasTestCase(unittest.TestCase):
+    def test_config_contexts(self):
+        test_values = {
+            "data": {"test_int": 123, "test_str": "testing", "test_list": [1, 2, 3],}
+        }
+        test = ConfigContexts(test_values, None, None)
+        self.assertTrue(test)
+
+    def test_config_contexts_diff_str(self):
+        test_values = {
+            "data": {
+                "test_int": 123,
+                "test_str": "testing",
+                "test_list": [1, 2, 3],
+                "test_dict": {"foo": "bar"},
+            }
+        }
+        test = ConfigContexts(test_values, None, None)
+        test.data["test_str"] = "bar"
+        self.assertEqual(test._diff(), {"data"})
+
+    def test_config_contexts_diff_dict(self):
+        test_values = {
+            "data": {
+                "test_int": 123,
+                "test_str": "testing",
+                "test_list": [1, 2, 3],
+                "test_dict": {"foo": "bar"},
+            }
+        }
+        test = ConfigContexts(test_values, None, None)
+        test.data["test_dict"].update({"bar": "foo"})
+        self.assertEqual(test._diff(), {"data"})