diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
new file mode 100644
index 0000000..45849b1
--- /dev/null
+++ b/.github/workflows/tests.yml
@@ -0,0 +1,30 @@
+name: tests
+
+on:
+  pull_request:
+  push:
+    branches: [main]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - 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: Lint (ruff)
+        run: |
+          ruff check .
+
+      - name: Run tests
+        run: |
+          pytest -q
+          
\ No newline at end of file
diff --git a/conftest.py b/conftest.py
new file mode 100644
index 0000000..4fa2d80
--- /dev/null
+++ b/conftest.py
@@ -0,0 +1,8 @@
+import sys
+from pathlib import Path
+
+# Ensure the project root is on sys.path so tests can import utils.py
+PROJECT_ROOT = Path(__file__).resolve().parent
+if str(PROJECT_ROOT) not in sys.path:
+    sys.path.insert(0, str(PROJECT_ROOT))
+    
\ No newline at end of file
diff --git a/requirements.txt b/requirements.txt
index 70b9f39..e35eafc 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,7 @@
 streamlit
 pandas
 plotly
-requests
\ No newline at end of file
+requests
+ruff
+pytest
+matplotlib
\ No newline at end of file