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backend/app/tests/e2e/test_expense_flow.py

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+"""
+End-to-end test for Expense creation flow.
+Uses the authenticated_client fixture to test POST /api/v1/expenses/add endpoint.
+"""
+import pytest
+import httpx
+from datetime import date
+
+
+@pytest.mark.asyncio
+async def test_expense_creation(authenticated_client: httpx.AsyncClient, setup_vehicle):
+    """
+    Test that a user can add an expense (fuel/service) to an asset.
+    Uses the setup_vehicle fixture to get a valid asset_id.
+    """
+    asset_id = setup_vehicle
+    
+    # Now add an expense for this asset
+    expense_payload = {
+        "asset_id": str(asset_id),  # must be string
+        "category": "fuel",  # or "service", "insurance", etc.
+        "amount": 15000.0,
+        "date": str(date.today()),  # YYYY-MM-DD
+    }
+    
+    response = await authenticated_client.post(
+        "/api/v1/expenses/add",
+        json=expense_payload
+    )
+    
+    # Assert success
+    assert response.status_code == 200, f"Unexpected status: {response.status_code}, response: {response.text}"
+    
+    data = response.json()
+    assert data["status"] == "success"
+    
+    print(f"✅ Expense added for asset {asset_id}")