diff --git a/.github/workflows/pytest.yaml b/.github/workflows/pytest.yaml
new file mode 100644
index 0000000..3497225
--- /dev/null
+++ b/.github/workflows/pytest.yaml
@@ -0,0 +1,26 @@
+name: Run Pytest
+
+on:
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  pytest:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: 3.11
+
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install -r requirements.txt
+
+      - name: Run pytest
+        run: pytest
diff --git a/langchain-crash-course/2_prompt_templates/prompt_template.py b/langchain-crash-course/2_prompt_templates/prompt_template.py
index c643b6d..d617099 100644
--- a/langchain-crash-course/2_prompt_templates/prompt_template.py
+++ b/langchain-crash-course/2_prompt_templates/prompt_template.py
@@ -1,16 +1,15 @@
+from dotenv import load_dotenv
 from langchain_core.messages.base import BaseMessage
-from langchain_core.prompts import PromptTemplate
-from langchain_core.prompts import ChatPromptTemplate
 from langchain_core.prompt_values import PromptValue
-from langchain_openai import ChatOpenAI
+from langchain_core.prompts import ChatPromptTemplate, PromptTemplate
 from langchain_ollama import ChatOllama
-from dotenv import load_dotenv
+from langchain_openai import ChatOpenAI
 
 # Load Environment Variables
 load_dotenv()
 
 # Create OpenAI Chat Model
-openai_model = ChatOpenAI(model="gpt-4o-mini")
+openai_model = ChatOpenAI(model="gpt-4.1-nano")
 
 # 1. String Prompt Template
 prompt_template: PromptTemplate = PromptTemplate.from_template(
diff --git a/langchain-crash-course/5_agents_tools/tests/test_agent_tools_basic.py b/langchain-crash-course/5_agents_tools/tests/test_agent_tools_basic.py
new file mode 100644
index 0000000..2d2dd34
--- /dev/null
+++ b/langchain-crash-course/5_agents_tools/tests/test_agent_tools_basic.py
@@ -0,0 +1,90 @@
+import importlib
+import os
+import re
+import sys
+from pathlib import Path
+
+import pytest
+
+
+# Helper to import the module with a clean environment
+def import_module_with_env(env_vars):
+    """Import agent_tools_basic.py after setting env variables."""
+    # Backup current env
+    backup_env = {k: os.getenv(k) for k in env_vars}
+
+    # Add parent directory to sys.path to allow for module import
+    module_path = str(Path(__file__).parent.parent.resolve())
+    sys.path.insert(0, module_path)
+
+    try:
+        # Explicitly clear any existing LLM env vars
+        for var in ("OPENAI_API_KEY", "OPENAI_LLM", "OLLAMA_LLM"):
+            os.environ.pop(var, None)
+
+        # Set the env vars supplied by the test
+        for k, v in env_vars.items():
+            os.environ[k] = v
+
+        # Invalidate any cached import
+        if "agent_tools_basic" in sys.modules:
+            del sys.modules["agent_tools_basic"]
+        module = importlib.import_module("agent_tools_basic")
+        return module
+    finally:
+        # Restore original env
+        for k, v in backup_env.items():
+            if v is None:
+                os.environ.pop(k, None)
+            else:
+                os.environ[k] = v
+        # Clean up sys.path
+        if sys.path and sys.path[0] == module_path:
+            sys.path.pop(0)
+
+
+@pytest.fixture
+def agent_module(monkeypatch):
+    """Fixture that imports the module with dummy LLM configuration."""
+    # Provide dummy values for OpenAI or Ollama
+    monkeypatch.setenv("OPENAI_API_KEY", "dummy_key")
+    monkeypatch.setenv("OPENAI_LLM", "dummy-model")
+    # Ensure no Ollama config interferes
+    monkeypatch.delenv("OLLAMA_LLM", raising=False)
+    return import_module_with_env(
+        {"OPENAI_API_KEY": "dummy_key", "OPENAI_LLM": "dummy-model"}
+    )
+
+
+def test_get_current_time_format(agent_module):
+    """get_current_time should return a string in YYYY-MM-DD HH:MM:SS format."""
+    current_time = agent_module.get_current_time()
+    assert isinstance(current_time, str)
+    # Regex for the expected datetime format
+    pattern = r"^\d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2}$"
+    assert re.match(pattern, current_time), f"Unexpected format: {current_time}"
+
+
+def test_tools_list_contains_current_time(agent_module):
+    """The tools list must contain a Tool named 'Current Time'."""
+    tools = agent_module.tools
+    assert isinstance(tools, list)
+    # Find tool by name
+    names = [tool.name for tool in tools]
+    assert "Current Time" in names, f"Tool 'Current Time' not found in {names}"
+
+
+def test_module_import_with_missing_llm(monkeypatch):
+    """Importing the module without any LLM configuration should raise ValueError."""
+    # Remove all relevant env vars
+    monkeypatch.delenv("OPENAI_API_KEY", raising=False)
+    monkeypatch.delenv("OPENAI_LLM", raising=False)
+    monkeypatch.delenv("OLLAMA_LLM", raising=False)
+
+    # Patch dotenv.load_dotenv to prevent loading from a .env file,
+    # which would interfere with this test.
+    monkeypatch.setattr("dotenv.load_dotenv", lambda *args, **kwargs: False)
+
+    with pytest.raises(ValueError) as excinfo:
+        import_module_with_env({})
+    assert "Neither OpenAI" in str(excinfo.value)
diff --git a/requirements.txt b/requirements.txt
new file mode 100644
index 0000000..56530e4
--- /dev/null
+++ b/requirements.txt
@@ -0,0 +1,4 @@
+pytest==8.3.5
+langchain-community==0.3.15
+langchain-ollama==0.2.3
+langchain-openai==0.3.1
\ No newline at end of file