diff --git a/app/streamlit/app_test.py b/app/streamlit/app_test.py
new file mode 100644
index 0000000..829f048
--- /dev/null
+++ b/app/streamlit/app_test.py
@@ -0,0 +1,56 @@
+import datetime
+from unittest.mock import patch
+from streamlit.testing.v1 import AppTest
+from openai.types.chat import ChatCompletionMessage
+from openai.types.chat.chat_completion import ChatCompletion, Choice
+
+
+# See https://github.com/openai/openai-python/issues/715#issuecomment-1809203346
+def create_chat_completion(response: str, role: str = "assistant") -> ChatCompletion:
+    return ChatCompletion(
+        id="foo",
+        model="gpt-3.5-turbo",
+        object="chat.completion",
+        choices=[
+            Choice(
+                finish_reason="stop",
+                index=0,
+                message=ChatCompletionMessage(
+                    content=response,
+                    role=role,
+                ),
+            )
+        ],
+        created=int(datetime.datetime.now().timestamp()),
+    )
+
+
+@patch("openai.resources.chat.Completions.create")
+def test_Chatbot(openai_create):
+    at = AppTest.from_file("Chatbot.py").run()
+    assert not at.exception
+    at.chat_input[0].set_value("Do you know any jokes?").run()
+    assert at.info[0].value == "Please add your OpenAI API key to continue."
+
+    JOKE = "Why did the chicken cross the road? To get to the other side."
+    openai_create.return_value = create_chat_completion(JOKE)
+    at.text_input(key="chatbot_api_key").set_value("sk-...")
+    at.chat_input[0].set_value("Do you know any jokes?").run()
+    print(at)
+    assert at.chat_message[1].markdown[0].value == "Do you know any jokes?"
+    assert at.chat_message[2].markdown[0].value == JOKE
+    assert at.chat_message[2].avatar == "assistant"
+    assert not at.exception
+
+
+@patch("langchain.llms.OpenAI.__call__")
+def test_Langchain_Quickstart(langchain_llm):
+    at = AppTest.from_file("pages/3_Langchain_Quickstart.py").run()
+    assert at.info[0].value == "Please add your OpenAI API key to continue."
+
+    RESPONSE = "1. The best way to learn how to code is by practicing..."
+    langchain_llm.return_value = RESPONSE
+    at.sidebar.text_input[0].set_value("sk-...")
+    at.button[0].set_value(True).run()
+    print(at)
+    assert at.info[0].value == RESPONSE
diff --git a/app/streamlit/requirements-dev.txt b/app/streamlit/requirements-dev.txt
new file mode 100644
index 0000000..8635be6
--- /dev/null
+++ b/app/streamlit/requirements-dev.txt
@@ -0,0 +1,5 @@
+black==23.3.0
+mypy==1.4.1
+pre-commit==3.3.3
+watchdog
+pytest
diff --git a/app/streamlit/requirements.txt b/app/streamlit/requirements.txt
new file mode 100644
index 0000000..3645968
--- /dev/null
+++ b/app/streamlit/requirements.txt
@@ -0,0 +1,8 @@
+streamlit>=1.28
+langchain>=0.0.217
+openai>=1.2
+duckduckgo-search
+anthropic>=0.3.0
+trubrics>=1.4.3
+streamlit-feedback
+langchain-community