eksplicit mapping af envs

backend/tests/test_stats.py

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+from unittest.mock import AsyncMock, MagicMock, patch
+
+import pytest
+from httpx import ASGITransport, AsyncClient
+
+from app.main import app
+
+
+@pytest.mark.asyncio
+async def test_stats_zero_sessions() -> None:
+    """Stats endpoint returns zeroed StatsResponse when no data exists."""
+    mock_db = AsyncMock()
+
+    with (
+        patch("app.services.stats_service.count_active_sessions", return_value=0),
+        patch("app.core.database.get_db", return_value=mock_db),
+    ):
+        # DB returns None for DailyStat row and empty for interest categories
+        mock_db.scalar = AsyncMock(return_value=None)
+        mock_db.scalars = AsyncMock(return_value=iter([]))
+
+        async with AsyncClient(
+            transport=ASGITransport(app=app), base_url="http://test"
+        ) as client:
+            response = await client.get("/stats")
+
+    assert response.status_code == 200
+    data = response.json()
+    assert "active_sessions_now" in data
+    assert "total_sessions_today" in data
+    assert "total_matches_today" in data
+    assert "top_interest_categories" in data
+    assert data["active_sessions_now"] == 0
+    assert data["total_sessions_today"] == 0
+    assert data["total_matches_today"] == 0
+    assert data["top_interest_categories"] == []
+
+
+@pytest.mark.asyncio
+async def test_stats_with_data() -> None:
+    """Stats endpoint returns correct values when DailyStat row exists."""
+    mock_stat = MagicMock()
+    mock_stat.total_sessions = 12
+    mock_stat.total_matches = 5
+
+    mock_category = MagicMock()
+    mock_category.category = "hiking"
+
+    mock_db = AsyncMock()
+
+    with (
+        patch("app.services.stats_service.count_active_sessions", return_value=3),
+        patch("app.core.database.get_db", return_value=mock_db),
+    ):
+        mock_db.scalar = AsyncMock(return_value=mock_stat)
+        mock_db.scalars = AsyncMock(return_value=iter([mock_category]))
+
+        async with AsyncClient(
+            transport=ASGITransport(app=app), base_url="http://test"
+        ) as client:
+            response = await client.get("/stats")
+
+    assert response.status_code == 200
+    data = response.json()
+    assert data["active_sessions_now"] == 3
+    assert data["total_sessions_today"] == 12
+    assert data["total_matches_today"] == 5
+    assert data["top_interest_categories"] == ["hiking"]