tests: added tests (#250)

tests/embedchain/test_chat.py

@@ -0,0 +1,48 @@
+import os
+import unittest
+from unittest.mock import patch
+
+from embedchain import App
+
+
+class TestApp(unittest.TestCase):
+    os.environ["OPENAI_API_KEY"] = "test_key"
+
+    def setUp(self):
+        self.app = App()
+
+    @patch("embedchain.embedchain.memory", autospec=True)
+    @patch.object(App, "retrieve_from_database", return_value=["Test context"])
+    @patch.object(App, "get_answer_from_llm", return_value="Test answer")
+    def test_chat_with_memory(self, mock_answer, mock_retrieve, mock_memory):
+        """
+        This test checks the functionality of the 'chat' method in the App class with respect to the chat history
+        memory.
+        The 'chat' method is called twice. The first call initializes the chat history memory.
+        The second call is expected to use the chat history from the first call.
+
+        Key assumptions tested:
+        - After the first call, 'memory.chat_memory.add_user_message' and 'memory.chat_memory.add_ai_message' are
+            called with correct arguments, adding the correct chat history.
+        - During the second call, the 'chat' method uses the chat history from the first call.
+
+        The test isolates the 'chat' method behavior by mocking out 'retrieve_from_database', 'get_answer_from_llm' and
+        'memory' methods.
+        """
+        mock_memory.load_memory_variables.return_value = {"history": []}
+        app = App()
+
+        # First call to chat
+        first_answer = app.chat("Test query 1")
+        self.assertEqual(first_answer, "Test answer")
+        mock_memory.chat_memory.add_user_message.assert_called_once_with("Test query 1")
+        mock_memory.chat_memory.add_ai_message.assert_called_once_with("Test answer")
+
+        mock_memory.chat_memory.add_user_message.reset_mock()
+        mock_memory.chat_memory.add_ai_message.reset_mock()
+
+        # Second call to chat
+        second_answer = app.chat("Test query 2")
+        self.assertEqual(second_answer, "Test answer")
+        mock_memory.chat_memory.add_user_message.assert_called_once_with("Test query 2")
+        mock_memory.chat_memory.add_ai_message.assert_called_once_with("Test answer")