diff --git a/pyproject.toml b/pyproject.toml
index a75f5fd..261b9bb 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -22,5 +22,22 @@ dependencies = [
 
 [project.optional-dependencies]
 dev = [
+    "pytest",
+    "pytest-env",
     "pre-commit",
+    "selenium",
+    "webdriver-manager",
+    "dash[testing]",
 ]
+
+[tool.pytest.ini_options]
+pythonpath = [
+  "src"
+]
+testpaths = [
+    "tests"
+]
+env = [
+    "DATA_FILE_PARQUET_PATH=tests/test.parquet"
+]
+addopts = "-p no:warnings"
diff --git a/src/app.py b/src/app.py
index e444c95..3f45aed 100644
--- a/src/app.py
+++ b/src/app.py
@@ -9,6 +9,10 @@ from flask import Response
 
 load_dotenv()
 
+# if os.getenv("PYTEST_CURRENT_TEST"):
+#     os.environ["DATA_FILE_PARQUET_PATH"]
+
+
 development = os.getenv("DEVELOPMENT").lower() == "true"
 
 meta_tags = [
@@ -22,7 +26,7 @@ meta_tags = [
 if development:
     meta_tags.append({"name": "robots", "content": "noindex"})
 
-app = Dash(
+app: Dash = Dash(
     title="decp.info",
     use_pages=True,
     compress=True,
diff --git a/tests/__init__.py b/tests/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/tests/conftest.py b/tests/conftest.py
new file mode 100644
index 0000000..cd58181
--- /dev/null
+++ b/tests/conftest.py
@@ -0,0 +1,41 @@
+import datetime
+import os
+
+import polars as pl
+import pytest
+
+
+@pytest.fixture(scope="session", autouse=True)
+def test_data():
+    data = [
+        {
+            "uid": "1",
+            "acheteur_nom": "Acheteur 1",
+            "acheteur_id": "a1",
+            "titulaire_nom": "Titulaire 1",
+            "titulaire_id": "t1",
+            "montant": 10,
+            "dateNotification": datetime.date(2025, 1, 1),
+            "codeCPV": "71600000",
+            "donneesActuelles": True,
+            "acheteur_departement_code": "75",
+            "acheteur_departement_nom": "Paris",
+            "acheteur_commune_nom": "Paris",
+            "titulaire_departement_code": "35",
+            "titulaire_departement_nom": "Ille-et-Vilaine",
+            "titulaire_commune_nom": "Rennes",
+            "titulaire_typeIdentifiant": "SIRET",
+            "objet": "Objet test",
+            "dureeRestanteMois": 12,
+            "lieuExecution_code": "75001",
+            "sourceFile": "test.xml",
+            "sourceDataset": "test_dataset",
+            "datePublicationDonnees": datetime.date(2025, 1, 1),
+        }
+    ]
+    path = "tests/test.parquet"
+    path = os.path.abspath(path)
+    print(f"Writing test data to: {path}")  # <-- This will show you the real path
+
+    pl.DataFrame(data).write_parquet("tests/test.parquet")
+    yield path
diff --git a/tests/test_main.py b/tests/test_main.py
new file mode 100644
index 0000000..8bac293
--- /dev/null
+++ b/tests/test_main.py
@@ -0,0 +1,31 @@
+from dash.testing.composite import DashComposite
+from selenium.webdriver import Keys
+from selenium.webdriver.common.by import By
+from selenium.webdriver.remote.webelement import WebElement
+
+
+def test_001_logo_and_search(dash_duo: DashComposite):
+    from src.app import app
+
+    dash_duo.start_server(app)
+    dash_duo.wait_for_text_to_equal(".logo > h1", "decp.info", timeout=4)
+    assert dash_duo.find_element(".logo > h1").text == "decp.info"
+    search_bar: WebElement = dash_duo.find_element("#search")
+    search_bar.click()
+    search_bar.send_keys("A")
+    search_bar.send_keys(Keys.ENTER)
+
+    dash_duo.wait_for_element("#results_acheteur_datatable")
+    result_table_acheteurs: WebElement = dash_duo.find_element(
+        "#results_acheteur_datatable tbody"
+    )
+
+    assert (
+        len(result_table_acheteurs.find_elements(by=By.TAG_NAME, value="tr")) == 2
+    )  # header row + 1 result
+    assert (
+        result_table_acheteurs.find_element(
+            by=By.CSS_SELECTOR, value='td[data-dash-column="acheteur_nom"]'
+        ).text
+        == "Acheteur 1"
+    )