diff --git a/tests/test_main.py b/tests/test_main.py
new file mode 100644
index 0000000..609be9e
--- /dev/null
+++ b/tests/test_main.py
@@ -0,0 +1,73 @@
+import pytest
+from fastapi.testclient import TestClient
+from app.main import app, lifespan
+from unittest.mock import patch, MagicMock
+
+@pytest.fixture
+def client():
+    """Test client for FastAPI app"""
+    return TestClient(app)
+
+def test_root_endpoint(client):
+    """Test root endpoint returns expected message"""
+    response = client.get("/")
+    assert response.status_code == 200
+    assert response.json() == {"message": "IPTV Updater API"}
+
+def test_openapi_schema_generation(client):
+    """Test OpenAPI schema is properly generated"""
+    # First call - generate schema
+    response = client.get("/openapi.json")
+    assert response.status_code == 200
+    schema = response.json()
+    assert schema["openapi"] == "3.1.0"
+    assert "securitySchemes" in schema["components"]
+    assert "Bearer" in schema["components"]["securitySchemes"]
+    
+    # Test empty components initialization
+    with patch("app.main.get_openapi", return_value={"info": {}}):
+        # Clear cached schema
+        app.openapi_schema = None
+        # Get schema with empty response
+        response = client.get("/openapi.json")
+        assert response.status_code == 200
+        schema = response.json()
+        assert "components" in schema
+        assert "schemas" in schema["components"]
+
+def test_openapi_schema_caching(mocker):
+    """Test OpenAPI schema caching behavior"""
+    # Clear any existing schema
+    app.openapi_schema = None
+    
+    # Mock get_openapi to return test schema
+    mock_schema = {"test": "schema"}
+    mocker.patch("app.main.get_openapi", return_value=mock_schema)
+    
+    # First call - should call get_openapi
+    schema = app.openapi()
+    assert schema == mock_schema
+    assert app.openapi_schema == mock_schema
+    
+    # Second call - should return cached schema
+    with patch("app.main.get_openapi") as mock_get_openapi:
+        schema = app.openapi()
+        assert schema == mock_schema
+        mock_get_openapi.assert_not_called()
+
+@pytest.mark.asyncio
+async def test_lifespan_init_db(mocker):
+    """Test lifespan manager initializes database"""
+    mock_init_db = mocker.patch("app.main.init_db")
+    async with lifespan(app):
+        pass  # Just enter/exit context
+    mock_init_db.assert_called_once()
+
+def test_router_inclusion():
+    """Test all routers are properly included"""
+    route_paths = {route.path for route in app.routes}
+    assert "/" in route_paths
+    assert any(path.startswith("/auth") for path in route_paths)
+    assert any(path.startswith("/channels") for path in route_paths)
+    assert any(path.startswith("/playlist") for path in route_paths)
+    assert any(path.startswith("/priorities") for path in route_paths)
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