school_compare/backend/tests/test_places_api.py

"""Tests for the places API (spec 2026-08-21)."""

import numpy as np
import pandas as pd
import pytest
from fastapi.testclient import TestClient


def _schools_df() -> pd.DataFrame:
    base = {
        "local_authority": "Essex", "school_type": "Academy",
        "phase": "Primary", "year": 202425, "ofsted_grade": 2.0,
        "ofsted_date": None, "attainment_8_score": np.nan,
        "town": "Brentwood", "postcode": "CM13 1AA", "status": "Open",
        "address": "1 Test Street", "latitude": 51.6, "longitude": 0.3,
    }
    return pd.DataFrame([
        {**base, "urn": 100000 + i, "school_name": f"Brentwood School {i}",
         "rwm_expected_pct": 50.0 + i}
        for i in range(6)
    ])


@pytest.fixture()
def client(monkeypatch):
    from backend import app as app_module

    monkeypatch.setattr(app_module, "load_school_data", _schools_df)
    monkeypatch.setattr(app_module, "load_latest_school_data", _schools_df)
    monkeypatch.setattr(app_module, "_place_registry", None)
    return TestClient(app_module.app, raise_server_exceptions=False)


def test_registry_lists_each_published_place(client):
    body = client.get("/api/places").json()
    slugs = {(p["kind"], p["slug"]) for p in body["places"]}
    assert ("town", "brentwood") in slugs
    assert ("authority", "essex") in slugs
    assert ("outcode", "cm13") in slugs


def test_registry_carries_a_count_per_place(client):
    body = client.get("/api/places").json()
    town = next(p for p in body["places"] if p["slug"] == "brentwood")
    assert town["count"] == 6


def test_place_detail_returns_its_schools_alphabetically(client):
    """A place page is read by someone looking for a school they can name.

    Scanning for it is what the order should serve, so the list is A-Z.
    /api/rankings is where the league-table ordering lives.
    """
    body = client.get("/api/places/town/brentwood").json()
    assert body["place"]["name"] == "Brentwood"
    names = [s["school_name"] for s in body["schools"]]
    assert names == sorted(names, key=str.lower)


def test_place_ordering_ignores_case(client):
    body = client.get("/api/places/town/brentwood").json()
    names = [s["school_name"] for s in body["schools"]]
    # A capitalised name must not sort ahead of every lowercase one.
    assert names == sorted(names, key=str.lower)


def test_the_rankings_endpoint_still_ranks_by_metric(client):
    # Alphabetical is a place-page decision, not a site-wide one.
    body = client.get("/api/rankings?metric=rwm_expected_pct&phase=primary").json()
    scores = [r["rwm_expected_pct"] for r in body.get("rankings", [])
              if r.get("rwm_expected_pct") is not None]
    assert scores == sorted(scores, reverse=True)


def test_place_detail_carries_the_local_average(client):
    body = client.get("/api/places/town/brentwood").json()
    # 50..55 inclusive
    assert body["averages"]["rwm_expected_pct"] == pytest.approx(52.5)


def test_phase_filter_narrows_the_school_list(client):
    body = client.get("/api/places/town/brentwood?phase=secondary").json()
    assert body["schools"] == []


def test_unknown_place_404s(client):
    assert client.get("/api/places/town/atlantis").status_code == 404


def test_unknown_kind_404s(client):
    assert client.get("/api/places/planet/mars").status_code == 404


def _straddling_df() -> pd.DataFrame:
    """Eight schools in CM13: six in Essex, which has a page, and two in an
    authority too small to have one.

    Two, not one: the registry ignores an authority holding a single school in
    a place, because GIAS carries occasional postcode errors."""
    df = _schools_df()
    extra = df.iloc[:2].copy()
    extra["urn"] = [200000, 200001]
    extra["school_name"] = ["Scilly School 0", "Scilly School 1"]
    extra["local_authority"] = "Isles Of Scilly"
    return pd.concat([df, extra], ignore_index=True)


@pytest.fixture()
def straddling_client(monkeypatch):
    from backend import app as app_module

    monkeypatch.setattr(app_module, "load_school_data", _straddling_df)
    monkeypatch.setattr(app_module, "load_latest_school_data", _straddling_df)
    monkeypatch.setattr(app_module, "_place_registry", None)
    return TestClient(app_module.app, raise_server_exceptions=False)


def test_an_outcode_reports_no_phases_because_it_has_no_phase_route(client):
    body = client.get("/api/places/outcode/cm13").json()
    assert body["place"]["phases"] == []


def test_an_authority_reports_the_phases_it_publishes(client):
    body = client.get("/api/places/authority/essex").json()
    assert body["place"]["phases"] == ["primary"]


def test_an_authority_without_a_page_is_named_but_carries_no_slug(straddling_client):
    """Two English authorities — City of London and the Isles of Scilly — hold
    fewer than the five schools a page needs, so they have no page.

    Naming them is still right: the page says where the place is. Linking them
    would not be. A null slug is what tells the page to print the name plainly
    rather than invent a URL that 404s.
    """
    body = straddling_client.get("/api/places/outcode/cm13").json()
    by_name = {a["name"]: a for a in body["place"]["authorities"]}
    assert by_name["Essex"]["slug"] == "essex"
    assert by_name["Isles Of Scilly"]["slug"] is None