diff --git a/src/__init__.py b/src/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/tests/test_ha_launcher_final.py b/tests/test_ha_launcher_final.py
new file mode 100644
index 0000000..7c7d2ac
--- /dev/null
+++ b/tests/test_ha_launcher_final.py
@@ -0,0 +1,89 @@
+import sys
+import subprocess
+from pathlib import Path
+from unittest.mock import patch, MagicMock
+import pytest
+
+# Ensure src is in sys.path
+import os
+sys.path.insert(0, os.path.abspath(os.path.join(os.path.dirname(__file__), '..')))
+
+from src.ha_launcher_final import main
+
+@patch("src.ha_launcher_final.subprocess.run")
+@patch("src.ha_launcher_final.print")
+def test_successful_system_install(mock_print, mock_run):
+    """Test successful installation in system directories."""
+    with patch("src.ha_launcher_final.Path.mkdir") as mock_mkdir, \
+         patch("src.ha_launcher_final.Path.exists") as mock_exists, \
+         patch("src.ha_launcher_final.Path.write_text") as mock_write_text:
+
+        mock_exists.return_value = False
+        # We want to make sure it doesn't raise PermissionError
+        mock_mkdir.return_value = None
+
+        main()
+
+        # Verify system paths were used
+        expected_system_config = "/Library/Application Support/HomeAssistant/config"
+
+        args, _ = mock_run.call_args
+        cmd = args[0]
+        assert "--config" in cmd
+        config_index = cmd.index("--config")
+        assert cmd[config_index + 1] == expected_system_config
+
+        mock_print.assert_any_call("✓ Répertoires et configuration prêts")
+        assert mock_mkdir.call_count == 2
+        mock_write_text.assert_called_once()
+
+@patch("src.ha_launcher_final.subprocess.run")
+@patch("src.ha_launcher_final.print")
+def test_permission_error_fallback(mock_print, mock_run):
+    """Test fallback to user directories when system directories are not writable."""
+    with patch("src.ha_launcher_final.Path.mkdir") as mock_mkdir, \
+         patch("src.ha_launcher_final.Path.home") as mock_home:
+
+        # Mock home directory
+        fake_home = Path("/tmp/fakehome")
+        mock_home.return_value = fake_home
+
+        # First call to mkdir (system config) raises PermissionError
+        mock_mkdir.side_effect = [PermissionError(), None, None]
+
+        main()
+
+        # Verify fallback paths were used in subprocess.run
+        expected_user_config = str(fake_home / "Library/Application Support/HomeAssistant/config")
+        expected_user_log = str(fake_home / "Library/Logs/HomeAssistant" / "home-assistant.log")
+
+        args, _ = mock_run.call_args
+        cmd = args[0]
+
+        assert "--config" in cmd
+        config_index = cmd.index("--config")
+        assert cmd[config_index + 1] == expected_user_config
+
+        assert "--log-file" in cmd
+        log_index = cmd.index("--log-file")
+        assert cmd[log_index + 1] == expected_user_log
+
+        mock_print.assert_any_call("✓ Répertoires utilisateur créés")
+        # 1 call for system config (fails), then 2 calls for user config and user log
+        assert mock_mkdir.call_count == 3
+
+@patch("src.ha_launcher_final.subprocess.run")
+@patch("src.ha_launcher_final.print")
+@patch("src.ha_launcher_final.sys.exit")
+def test_subprocess_error(mock_exit, mock_print, mock_run):
+    """Test handling of subprocess error."""
+    with patch("src.ha_launcher_final.Path.mkdir") as mock_mkdir, \
+         patch("src.ha_launcher_final.Path.exists") as mock_exists:
+
+        mock_exists.return_value = True
+        mock_run.side_effect = subprocess.CalledProcessError(1, 'cmd')
+
+        main()
+
+        mock_print.assert_any_call("Erreur lancement Home Assistant: Command 'cmd' returned non-zero exit status 1.")
+        mock_exit.assert_called_once_with(1)