Add unit tests for answer schema, request data schema, base controller, and history manager

tests/test_answer_schema.py

@@ -0,0 +1,16 @@
+import unittest
+from schema.answer import Answer
+from schema.status import Status
+
+
+class TestAnswerSchema(unittest.TestCase):
+    def test_answer_creation(self):
+        status = Status.success
+        message = "Test message"
+        answer = Answer(status=status, message=message)
+        self.assertEqual(answer.status, status)
+        self.assertEqual(answer.message, message)
+
+
+if __name__ == '__main__':
+    unittest.main()