Visione: quota non prodotta salvata come NaN (value NULL, fail) invece del 422; migrazione 022

Refs #118

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

src/backend/tests/test_nan_measurements.py

@@ -0,0 +1,114 @@
+"""#118: una quota non misurata dalla visione e' una misura con value NULL (NaN), sempre fail.
+
+Il valore NULL non deve far cadere statistiche, report, CSV e liste, e non entra
+nei calcoli numerici (medie, indici, istogramma); conta solo nell'esito.
+"""
+import csv
+
+from httpx import AsyncClient
+from sqlalchemy.ext.asyncio import AsyncSession
+
+from src.backend.models.orm.measurement import Measurement
+from src.backend.models.orm.user import User
+from src.backend.services import measurement_service
+from src.backend.tests.conftest import auth_headers, create_test_recipe
+from src.backend.tests.test_statistics import _seed_measurements
+
+
+async def _recipe_with_nan(client, db_session, tec_user):
+    """Una ricetta con tre misure numeriche e una NaN (value NULL, fail)."""
+    recipe = await create_test_recipe(db_session, tec_user.id)
+    subtask_id, version_id = await _seed_measurements(
+        client, tec_user, recipe.id, [10.0, 10.1, 9.9],
+    )
+    nan = await measurement_service.save_measurement(
+        db_session, subtask_id=subtask_id, version_id=version_id,
+        measured_by=tec_user.id, value=None, input_method="camera",
+        enforce_tolerance_gate=False,
+    )
+    await db_session.commit()
+    return recipe, subtask_id, version_id, nan
+
+
+async def test_save_measurement_none_is_fail_without_deviation(
+    client: AsyncClient, db_session: AsyncSession, measurement_tec_user: User,
+):
+    _, _, _, nan = await _recipe_with_nan(client, db_session, measurement_tec_user)
+    assert nan.value is None
+    assert nan.pass_fail == "fail"
+    assert nan.deviation is None
+
+
+async def test_manual_create_still_requires_a_value(
+    client: AsyncClient, db_session: AsyncSession, measurement_tec_user: User,
+):
+    """Solo il percorso visione puo' produrre NaN: la creazione manuale resta float."""
+    recipe = await create_test_recipe(db_session, measurement_tec_user.id)
+    subtask_id, version_id = await _seed_measurements(
+        client, measurement_tec_user, recipe.id, [],
+    )
+    resp = await client.post(
+        "/api/measurements/", headers=auth_headers(measurement_tec_user),
+        json={"subtask_id": subtask_id, "version_id": version_id, "value": None},
+    )
+    assert resp.status_code == 422
+
+
+async def test_statistics_skip_the_nan_measurement(
+    client: AsyncClient, db_session: AsyncSession,
+    measurement_tec_user: User, metrologist_user: User,
+):
+    recipe, subtask_id, _, _ = await _recipe_with_nan(
+        client, db_session, measurement_tec_user,
+    )
+    params = {"recipe_id": recipe.id, "subtask_id": subtask_id}
+    headers = auth_headers(metrologist_user)
+
+    cap = await client.get("/api/statistics/capability", headers=headers, params=params)
+    assert cap.status_code == 200
+    assert cap.json()["n"] == 3
+    assert abs(cap.json()["mean"] - 10.0) < 1e-9
+
+    chart = await client.get("/api/statistics/control-chart", headers=headers, params=params)
+    assert chart.status_code == 200
+    assert len(chart.json()["values"]) == 3
+
+    hist = await client.get("/api/statistics/histogram", headers=headers, params=params)
+    assert hist.status_code == 200
+
+    summary = await client.get(
+        "/api/statistics/summary", headers=headers, params={"recipe_id": recipe.id},
+    )
+    assert summary.status_code == 200
+
+
+async def test_measurement_list_returns_null_value(
+    client: AsyncClient, db_session: AsyncSession, measurement_tec_user: User,
+):
+    _, _, version_id, nan = await _recipe_with_nan(client, db_session, measurement_tec_user)
+    resp = await client.get(
+        "/api/measurements/", headers=auth_headers(measurement_tec_user),
+        params={"version_id": version_id, "per_page": 50},
+    )
+    assert resp.status_code == 200
+    rows = {m["id"]: m for m in resp.json()["items"]}
+    assert rows[nan.id]["value"] is None
+    assert rows[nan.id]["pass_fail"] == "fail"
+    assert rows[nan.id]["deviation"] is None
+
+
+async def test_csv_export_writes_nan(
+    client: AsyncClient, db_session: AsyncSession, measurement_tec_user: User,
+):
+    _, _, _, nan = await _recipe_with_nan(client, db_session, measurement_tec_user)
+    resp = await client.get(
+        "/api/measurements/export/csv", headers=auth_headers(measurement_tec_user),
+    )
+    assert resp.status_code == 200
+    rows = list(csv.reader(resp.text.splitlines()))
+    header = rows[0]
+    by_id = {r[header.index("id")]: r for r in rows[1:]}
+    row = by_id[str(nan.id)]
+    assert row[header.index("value")] == "NaN"
+    assert row[header.index("pass_fail")] == "fail"
+    assert row[header.index("deviation")] == ""