feat(models): Add unittest for Ref model.

Author: Ayush0Chaudhary

tests/models/github/test_ref.py

@@ -0,0 +1,10 @@
+import unittest
+
+from bot.models.github.ref import Ref
+
+
+class RefTest(unittest.TestCase):
+
+    def test_should_create_Ref(self):
+        ref = Ref(name="hey this is unittest ref", ref_type="branch")
+        self.assertEqual(str(ref), "hey this is unittest ref")