diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
new file mode 100644
index 0000000..338bc4f
--- /dev/null
+++ b/.github/workflows/test.yml
@@ -0,0 +1,35 @@
+name: test
+
+on:
+  pull_request:
+  push:
+    branches:
+      - main
+
+jobs:
+  tests:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: ["3.11", "3.12"]
+    steps:
+      - uses: actions/checkout@v4
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: ${{ matrix.python-version }}
+          cache: 'pip'
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install -r requirements.txt -r requirements-dev.txt
+          playwright install --with-deps
+      - name: Run unit and integration tests
+        run: pytest tests/unit tests/integration
+      - name: Run e2e tests
+        run: pytest tests/e2e
+      - name: Upload coverage
+        uses: actions/upload-artifact@v4
+        with:
+          name: coverage-${{ matrix.python-version }}
+          path: coverage.xml
diff --git a/TESTING_GUIDE.md b/TESTING_GUIDE.md
new file mode 100644
index 0000000..714d542
--- /dev/null
+++ b/TESTING_GUIDE.md
@@ -0,0 +1,26 @@
+# Testing Guide
+
+This project uses **pytest** for unit and integration tests and **Playwright** for end-to-end tests.
+
+## Setup
+
+1. Install Python dependencies:
+   ```bash
+   pip install -r requirements.txt -r requirements-dev.txt
+   playwright install --with-deps
+   ```
+
+## Running Tests
+
+- **Unit & Integration**:
+  ```bash
+  pytest
+  ```
+  Coverage is enforced at 80% by default.
+
+- **End-to-End**:
+  ```bash
+  pytest tests/e2e
+  ```
+
+Playwright will start the local server automatically during the E2E tests.
diff --git a/playwright.config.py b/playwright.config.py
new file mode 100644
index 0000000..27b71e7
--- /dev/null
+++ b/playwright.config.py
@@ -0,0 +1,9 @@
+import os
+from playwright.sync_api import Playwright
+
+BASE_URL = os.getenv('BASE_URL', 'http://localhost:5000')
+
+# Default configuration for Playwright tests
+
+def pytest_configure(config):
+    config.base_url = BASE_URL
diff --git a/pytest.ini b/pytest.ini
new file mode 100644
index 0000000..97c6a56
--- /dev/null
+++ b/pytest.ini
@@ -0,0 +1,4 @@
+[pytest]
+addopts = --cov=src --cov-report=term-missing --cov-report=xml --cov-fail-under=80
+testpaths = tests
+
diff --git a/requirements-dev.txt b/requirements-dev.txt
new file mode 100644
index 0000000..7b081c1
--- /dev/null
+++ b/requirements-dev.txt
@@ -0,0 +1,4 @@
+pytest>=8.0,<9.0
+pytest-cov>=4.1,<5.0
+pytest-playwright>=0.4,<0.5
+playwright>=1.40,<2.0
diff --git a/requirements.txt b/requirements.txt
index d39ab37..f470cff 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,4 @@
-numpy==1.24.3
+numpy==1.26.4
 plotly==5.14.1
 flask==2.3.2
 gunicorn==22.0.0
diff --git a/tests/__init__.py b/tests/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/tests/e2e/__init__.py b/tests/e2e/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/tests/e2e/test_smoke.py b/tests/e2e/test_smoke.py
new file mode 100644
index 0000000..479d66c
--- /dev/null
+++ b/tests/e2e/test_smoke.py
@@ -0,0 +1,21 @@
+import subprocess
+import time
+import os
+
+import pytest
+
+SERVER_PORT = os.getenv('PORT', '5000')
+
+@pytest.fixture(scope="session", autouse=True)
+def server():
+    proc = subprocess.Popen(["python", "src/app.py"], env={**os.environ, "FLASK_DEBUG": "false"})
+    time.sleep(3)
+    yield
+    proc.terminate()
+    proc.wait()
+
+
+@pytest.mark.asyncio
+async def test_homepage(page):
+    await page.goto(f"http://localhost:{SERVER_PORT}/")
+    assert await page.text_content("body") is not None
diff --git a/tests/integration/__init__.py b/tests/integration/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/tests/integration/test_routes.py b/tests/integration/test_routes.py
new file mode 100644
index 0000000..f18656a
--- /dev/null
+++ b/tests/integration/test_routes.py
@@ -0,0 +1,27 @@
+from src.app import app
+
+
+def test_compute_topological_compatibility_route():
+    client = app.test_client()
+    payload = {
+        'skb1': {
+            'tx': 0.1,
+            'ty': 0.1,
+            'tz': 0.1,
+            'tt': 0.1,
+            'orientable': 1,
+            'genus': 0
+        },
+        'skb2': {
+            'tx': -0.1,
+            'ty': -0.1,
+            'tz': -0.1,
+            'tt': -0.1,
+            'orientable': 1,
+            'genus': 0
+        }
+    }
+    response = client.post('/compute_topological_compatibility', json=payload)
+    assert response.status_code == 200
+    data = response.get_json()
+    assert 'compatible' in data
diff --git a/tests/unit/__init__.py b/tests/unit/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/tests/unit/test_app.py b/tests/unit/test_app.py
new file mode 100644
index 0000000..3cabd9e
--- /dev/null
+++ b/tests/unit/test_app.py
@@ -0,0 +1,34 @@
+import numpy as np
+from src import app as app_module
+
+
+def test_generate_twisted_strip_shape():
+    twists = [1, 1, 1, 0]
+    x, y, z, u, v = app_module.generate_twisted_strip(twists, t=0.0, loop_factor=1)
+    assert x.shape == (50, 50)
+    assert y.shape == (50, 50)
+    assert z.shape == (50, 50)
+    assert u.shape == (50, 50)
+    assert v.shape == (50, 50)
+
+
+def test_compute_topological_compatibility_returns_dict():
+    skb1 = {
+        'tx': 0.1,
+        'ty': 0.1,
+        'tz': 0.1,
+        'tt': 0.1,
+        'orientable': 1,
+        'genus': 0
+    }
+    skb2 = {
+        'tx': -0.1,
+        'ty': -0.1,
+        'tz': -0.1,
+        'tt': -0.1,
+        'orientable': 1,
+        'genus': 0
+    }
+    result = app_module.compute_topological_compatibility(skb1=skb1, skb2=skb2)
+    assert isinstance(result, dict)
+    assert 'compatible' in result