school_compare/e2e/tests/journeys.spec.ts

import { test, expect, Page } from '@playwright/test';

/**
 * Journey tests for SchoolCompare, run against the staging environment as the
 * gate before promotion to production. They assert stable data invariants
 * (results exist, key UI renders) rather than exact numbers, so routine data
 * refreshes don't break the pipeline.
 */

async function searchByName(page: Page, query: string) {
  await page.goto('/');
  const searchInput = page.getByPlaceholder('School name or postcode').first();
  await searchInput.fill(query);
  await searchInput.press('Enter');
  await page.waitForURL(/search=|postcode=/);
}

function schoolLinks(page: Page) {
  return page.locator('a[href^="/school/"]');
}

/**
 * Two URNs guaranteed to be pure-primary (same phase). The compare page's
 * phase tabs split all-through schools (which carry KS4 data) onto the
 * secondary tab, so picking two arbitrary "primary" search hits can land
 * them on different tabs where only the active one renders. Selecting via
 * the API by exact phase keeps both on the same tab. Data-invariant: uses
 * whatever primaries the environment holds.
 */
async function twoPrimaryUrns(page: Page): Promise<[string, string]> {
  const res = await page.request.get('/api/schools?search=primary&per_page=50');
  expect(res.ok()).toBeTruthy();
  const body = await res.json();
  const urns: string[] = (body.schools ?? [])
    .filter((s: { phase?: string; rwm_expected_pct?: number | null }) =>
      s.phase === 'Primary' && s.rwm_expected_pct != null,
    )
    .map((s: { urn: number }) => String(s.urn));
  expect(urns.length).toBeGreaterThanOrEqual(2);
  return [urns[0], urns[1]];
}

async function twoSecondaryUrns(page: Page): Promise<[string, string]> {
  const res = await page.request.get('/api/schools?search=school&per_page=100');
  expect(res.ok()).toBeTruthy();
  const body = await res.json();
  const urns: string[] = (body.schools ?? [])
    .filter((s: { phase?: string; attainment_8_score?: number | null }) =>
      s.phase === 'Secondary' && s.attainment_8_score != null,
    )
    .map((s: { urn: number }) => String(s.urn));
  expect(urns.length).toBeGreaterThanOrEqual(2);
  return [urns[0], urns[1]];
}

test('home page loads with hero search', async ({ page }) => {
  await page.goto('/');
  await expect(page.locator('h1').first()).toBeVisible();
  await expect(page.getByPlaceholder('School name or postcode').first()).toBeVisible();
});

test('home hero offers a "use my location" shortcut beside the search box', async ({ page }) => {
  await page.goto('/');
  // The geolocation shortcut lives inside the hero search card, right under the
  // search input — not in a separate strip further down the page.
  const searchInput = page.getByPlaceholder('School name or postcode').first();
  await expect(searchInput).toBeVisible();
  const nearMe = page.getByRole('button', { name: /use my location/i });
  await expect(nearMe).toBeVisible();
});

test('searching by name returns school results', async ({ page }) => {
  await searchByName(page, 'primary');
  await expect(schoolLinks(page).first()).toBeVisible({ timeout: 15_000 });
  expect(await schoolLinks(page).count()).toBeGreaterThan(1);
});

test('searching by postcode returns nearby schools', async ({ page }) => {
  await searchByName(page, 'B1 1BB');
  await expect(schoolLinks(page).first()).toBeVisible({ timeout: 15_000 });
});

test('a report-card school shows a Report Card badge in search results, not its old grade', async ({ page }) => {
  // List/map badges keyed off ofsted_grade (the carried-forward legacy grade)
  // and never reached the report-card branch, so report-card schools were
  // labelled by their old grade (e.g. "Outstanding · 2021"). The list now
  // carries ofsted_rc_date and the badge treats a report card as winning.
  const RC_URN = 138690; // Barclay Primary — has a Nov-2025+ report card
  const res = await page.request.get(`/api/schools?search=Barclay%20Primary&page_size=5`);
  expect(res.ok()).toBeTruthy();
  const barclay = ((await res.json()).schools ?? []).find(
    (s: { urn: number }) => s.urn === RC_URN,
  );
  // Hard assertions, not test.skip: if the backend stops exposing
  // ofsted_rc_date for this report-card school, that IS the regression this
  // test exists to catch, so it must fail loudly rather than skip.
  expect(barclay, 'Barclay must appear in the search results').toBeTruthy();
  expect(
    barclay.ofsted_rc_date,
    'the list must expose ofsted_rc_date for a report-card school',
  ).toBeTruthy();

  await searchByName(page, 'Barclay Primary');
  // The Barclay row must be present…
  await expect(page.locator(`a[href*="${RC_URN}"]`).first()).toBeVisible({ timeout: 15_000 });
  // …badged as a Report Card, not its carried-forward "Outstanding" grade.
  await expect(page.getByText(/Report Card ·/).first()).toBeVisible();
});

test('school detail page renders name and performance data', async ({ page }) => {
  await searchByName(page, 'primary');
  const firstSchool = schoolLinks(page).first();
  await expect(firstSchool).toBeVisible({ timeout: 15_000 });
  await firstSchool.click();
  await page.waitForURL(/\/school\//);
  await expect(page.locator('h1').first()).toBeVisible();
  // The detail page renders at least one *visible* chart canvas. Plain
  // .first() is wrong here: the admissions card stacks its year/trend views
  // in one grid cell and keeps the inactive view's canvas visibility:hidden
  // by design, and that canvas comes first in the DOM.
  await expect(page.locator('canvas:visible').first()).toBeVisible({ timeout: 15_000 });
});

test('school detail page shows GIAS identity/contact details and drops the unwired Phonics section', async ({ page }) => {
  const [urn] = await twoPrimaryUrns(page);
  const res = await page.request.get(`/api/schools/${urn}`);
  expect(res.ok()).toBeTruthy();
  const info = (await res.json()).school_info;

  await page.goto(`/school/${urn}`);
  await expect(page.locator('h1').first()).toBeVisible({ timeout: 15_000 });

  // Phonics, SEN-type breakdown and average class size were never populated by
  // the backend — the sections have been removed, so the Phonics section (its
  // own #phonics anchor) must no longer exist.
  await expect(page.locator('#phonics')).toHaveCount(0);

  // Newly surfaced GIAS/location fields render when the record carries them.
  const ageMatch = String(info.age_range ?? '').match(/^\s*(\d+)\s*[-–]\s*(\d+)\s*$/);
  if (ageMatch) {
    await expect(page.getByText(`Ages ${ageMatch[1]}–${ageMatch[2]}`).first()).toBeVisible();
  }
  if (info.telephone) {
    await expect(page.locator('a[href^="tel:"]').first()).toBeVisible();
  }
  if (info.parliamentary_constituency) {
    await expect(page.getByText('Constituency:').first()).toBeVisible();
  }
});

test('header details collapse behind a "Show all details" toggle on mobile', async ({ page }) => {
  await page.setViewportSize({ width: 390, height: 844 });
  const [urn] = await twoPrimaryUrns(page);
  await page.goto(`/school/${urn}`);
  await expect(page.locator('h1').first()).toBeVisible({ timeout: 15_000 });

  // Collapsed by default on mobile/tablet …
  const details = page.locator('#school-header-details');
  await expect(details).toBeHidden();
  const toggle = page.getByRole('button', { name: /show all details/i });
  await expect(toggle).toBeVisible();

  // … and the link reveals them (label flips to "Hide details").
  await toggle.click();
  await expect(details).toBeVisible();
  await expect(page.getByRole('button', { name: /hide details/i })).toBeVisible();
});

test('a report-card school shows its report card, dated to the report-card inspection', async ({ page }) => {
  // Detail views detected report cards via `framework`, which the API never
  // sets to "ReportCard" — so report-card schools rendered as legacy ratings
  // dated to a pre-Nov-2025 inspection. Detection now keys off the report_card
  // object and dates it with rc_inspection_date.
  const RC_URN = 138690; // Barclay Primary — has a Nov-2025+ report card
  const res = await page.request.get(`/api/schools/${RC_URN}`);
  expect(res.ok()).toBeTruthy();
  const ofsted = (await res.json()).ofsted;
  test.skip(
    !ofsted?.report_card || Object.keys(ofsted.report_card).length === 0,
    'precondition: chosen URN must currently have a report card',
  );
  const rcYear = new Date(ofsted.rc_inspection_date).getFullYear();
  const legacyYear = new Date(ofsted.inspection_date).getFullYear();

  await page.goto(`/school/${RC_URN}`);
  const ofstedSection = page.locator('#ofsted');
  // Detection fixed: rendered as a Report Card, not a legacy "Ofsted Rating".
  await expect(ofstedSection.getByText('Ofsted Report Card')).toBeVisible({ timeout: 15_000 });
  // Dating fixed: dated to the report-card inspection, never the legacy one.
  await expect(ofstedSection.getByText(new RegExp(`Inspected .*${rcYear}`))).toBeVisible();
  if (legacyYear !== rcYear) {
    await expect(ofstedSection.getByText(new RegExp(`Inspected .*${legacyYear}`))).toHaveCount(0);
  }
});

test('an all-through school shows BOTH its KS2 SATs and its GCSE results, not just one phase', async ({ page }) => {
  // All-through schools carry both KS2 and KS4 data in the same yearly rows.
  // The detail view used to flip them to isSecondary and render GCSE-only,
  // hiding the primary phase. It now renders both phases and labels the school
  // "All-through".
  const AT_URN = 137306; // Hessle High School and Penshurst Primary — all-through
  const res = await page.request.get(`/api/schools/${AT_URN}`);
  expect(res.ok()).toBeTruthy();
  const detail = await res.json();
  const rows: Array<{ rwm_expected_pct: number | null; attainment_8_score: number | null }> =
    detail.yearly_data ?? [];
  const hasKS2 = rows.some((r) => r.rwm_expected_pct != null);
  const hasKS4 = rows.some((r) => r.attainment_8_score != null);
  test.skip(
    (detail.school_info?.phase ?? '').toLowerCase() !== 'all-through' || !hasKS2 || !hasKS4,
    'precondition: chosen URN must currently be all-through with both KS2 and KS4 results',
  );

  await page.goto(`/school/${AT_URN}`);
  await expect(page.locator('h1').first()).toBeVisible({ timeout: 15_000 });

  // Labelled as all-through in the hero meta.
  await expect(page.getByText(/All-through/i).first()).toBeVisible();

  // The combined results section carries both phases.
  const results = page.locator('#results');
  await expect(results.getByText(/SATs & GCSE Results/)).toBeVisible();
  await expect(results.getByRole('heading', { name: /Primary.*KS2 SATs/ })).toBeVisible(); // KS2 block
  await expect(results.getByRole('heading', { name: /Secondary.*GCSEs/ })).toBeVisible(); // KS4 block
});

test('a special school is not shown as failing against the mainstream England average', async ({ page }) => {
  // Special schools sit the same tests but very few pupils reach the mainstream
  // "expected standard", so a "0.0% · −62 pts below England average" rendering
  // portrays them as failing against a benchmark that doesn't fit. The results
  // section drops the England comparison and explains the context instead.
  const SP_URN = 101099; // Greenmead School — a community special school
  const res = await page.request.get(`/api/schools/${SP_URN}`);
  expect(res.ok()).toBeTruthy();
  const detail = await res.json();
  test.skip(
    !/special|pupil referral|alternative provision/i.test(detail.school_info?.school_type ?? ''),
    'precondition: chosen URN must currently be a special school',
  );

  await page.goto(`/school/${SP_URN}`);
  const results = page.locator('#results');
  // The special-school context note is shown…
  await expect(results.getByText(/This is a special school/i)).toBeVisible({ timeout: 15_000 });
  // …and the mainstream England-average comparison is dropped entirely.
  await expect(results.getByText(/England avg/i)).toHaveCount(0);
});

test('school with no performance data still gets a working detail page', async ({ page }) => {
  // Schools without KS2/KS4 results (special post-16 institutions, sixth-form
  // centres, PRUs) used to 500 in the API — NaN GIAS fields broke JSON
  // serialization — which the frontend rendered as a 404 on every such SEO
  // landing page. Find one via the search API (year === null marks "no
  // performance rows") and assert its page renders.
  const candidates: number[] = [];
  for (const q of ['post 16', 'specialist college', 'sixth form']) {
    const resp = await page.request.get(
      `/api/schools?search=${encodeURIComponent(q)}&per_page=20`
    );
    if (!resp.ok()) continue;
    const body = await resp.json();
    for (const s of body.schools ?? []) {
      if (s.year === null && s.urn) candidates.push(s.urn);
    }
    if (candidates.length) break;
  }
  test.skip(candidates.length === 0, 'no results-less school in this dataset');

  const detail = await page.request.get(`/api/schools/${candidates[0]}`);
  expect(detail.status(), 'detail API must not 500 for a results-less school').toBe(200);

  await page.goto(`/school/${candidates[0]}`);
  await page.waitForURL(/\/school\/\d+-/); // redirected to canonical slug
  await expect(page.locator('h1').first()).toBeVisible();
});

test('school hero map opens fullscreen on mobile without the Fullscreen API', async ({ page }) => {
  // iOS Safari has no Element.requestFullscreen; the map must fall back to a
  // CSS overlay. Simulate that by removing the API before any page script runs.
  await page.setViewportSize({ width: 390, height: 844 });
  await page.addInitScript(() => {
    // @ts-expect-error deliberate API removal
    delete Element.prototype.requestFullscreen;
  });

  await searchByName(page, 'primary');
  const firstSchool = schoolLinks(page).first();
  await expect(firstSchool).toBeVisible({ timeout: 15_000 });
  await firstSchool.click();
  await page.waitForURL(/\/school\//);

  const openMap = page.getByRole('button', { name: 'Open full map' });
  await expect(openMap).toBeVisible({ timeout: 15_000 });
  await openMap.click();

  const closeMap = page.getByRole('button', { name: 'Close map' });
  await expect(closeMap).toBeVisible();
  await closeMap.click();
  await expect(openMap).toBeVisible();
});

test('results map fullscreen falls back to an overlay on iOS', async ({ page }) => {
  // Same iOS gap as the hero map: no Element.requestFullscreen, so the results
  // map's fullscreen button must fall back to a CSS overlay.
  await page.setViewportSize({ width: 390, height: 844 });
  await page.addInitScript(() => {
    // @ts-expect-error deliberate API removal
    delete Element.prototype.requestFullscreen;
  });

  await searchByName(page, 'B1 1BB');
  await expect(schoolLinks(page).first()).toBeVisible({ timeout: 15_000 });

  // Switch to the map view, then open the map fullscreen.
  await page.getByRole('button', { name: 'Map', exact: true }).click();
  const openFs = page.getByRole('button', { name: 'View map fullscreen' });
  await expect(openFs).toBeVisible({ timeout: 15_000 });
  await openFs.click();

  // The button flips to its exit state once the overlay is up.
  const exitFs = page.getByRole('button', { name: 'Exit fullscreen' });
  await expect(exitFs).toBeVisible();
  await exitFs.click();
  await expect(openFs).toBeVisible();
});

test('comparing two schools shows the parent-first sections side by side', async ({ page }) => {
  // Two same-phase (pure primary) schools so both stay on one tab.
  const [urn0, urn1] = await twoPrimaryUrns(page);

  await page.goto(`/compare?urns=${urn0},${urn1}`);
  // Both schools' detail links should render in the comparison view
  await expect(page.locator(`a[href*="${urn0}"]`).first()).toBeVisible({ timeout: 15_000 });
  await expect(page.locator(`a[href*="${urn1}"]`).first()).toBeVisible();

  // The parent-first sections render in order (data-invariant: headings only)
  for (const heading of [
    'At a glance',
    'Ofsted inspection',
    /How (children|students) do academically/,
    'Who goes there',
    'Explore trends',
  ]) {
    await expect(
      page.getByRole('heading', { name: heading }).first(),
    ).toBeVisible({ timeout: 15_000 });
  }

  // Every number gets an anchor: at least one England-average tick or label
  await expect(page.getByText(/England \d+/).first()).toBeVisible();

  // Desktop: the sticky school bar shares the sections' grid template
  // (200px label rail + one column per school) so chips align with the
  // columns they label.
  const barTemplate = await page
    .locator('[aria-label="Schools in this comparison"]')
    .evaluate((el) => getComputedStyle(el).gridTemplateColumns);
  expect(barTemplate).toMatch(/^200px /);
  // ...and its label rail carries the comparison caption.
  await expect(page.getByText(/^\d+ (primary|secondary) schools?$/)).toBeVisible();

  // Ofsted linkout goes to the school's provider page, never a report deep-link
  const ofstedLink = page.getByRole('link', { name: /Ofsted page/i }).first();
  await expect(ofstedLink).toBeVisible();
  expect(await ofstedLink.getAttribute('href')).toMatch(
    /reports\.ofsted\.gov\.uk\/provider\/21\/\d+/
  );

  // A school never shows both an overall-grade badge AND report-card detail:
  // "Report card" implies "no overall grade is given" copy is present too.
  const reportCards = await page.getByText('Report card', { exact: true }).count();
  if (reportCards > 0) {
    await expect(page.getByText(/no overall grade/i).first()).toBeVisible();
  }
});

test('comparing two secondary schools renders the secondary sections', async ({ page }) => {
  const [urn0, urn1] = await twoSecondaryUrns(page);

  await page.goto(`/compare?urns=${urn0},${urn1}`);
  await expect(page.locator(`a[href*="${urn0}"]`).first()).toBeVisible({ timeout: 15_000 });

  // The parent-first sections must render — this page was completely blank
  // for all-secondary baskets (expert review must-fix #1).
  await expect(page.getByRole('heading', { name: 'At a glance' }).first()).toBeVisible({
    timeout: 15_000,
  });
  await expect(page.getByRole('heading', { name: 'Ofsted inspection' }).first()).toBeVisible();
  // A KS4 measure proves the secondary academics variant rendered.
  await expect(page.getByText(/Attainment 8/i).first()).toBeVisible();
  await expect(page.getByText(/No primary schools in your comparison/)).toHaveCount(0);

  // The admissions template must be phase-aware: the primaries' distance
  // copy ("non-faith primaries") must never appear on a secondary comparison
  // (expert sign-off must-fix M3).
  await expect(page.getByText(/non-faith primaries/)).toHaveCount(0);
});

test('opening a different compare link after a previous comparison still renders', async ({ page }) => {
  // Regression: the first visit stores a basket in localStorage; opening a
  // link for a DIFFERENT school set then raced a stale fetch for the stored
  // basket against the new SSR data, blanking every section (including the
  // trends chart) until a hard refresh.
  const [s0, s1] = await twoSecondaryUrns(page);
  const [p0, p1] = await twoPrimaryUrns(page);

  await page.goto(`/compare?urns=${s0},${s1}`);
  await expect(page.getByRole('heading', { name: 'At a glance' }).first()).toBeVisible({
    timeout: 15_000,
  });

  await page.goto(`/compare?urns=${p0},${p1}`);
  await expect(page.getByRole('heading', { name: 'At a glance' }).first()).toBeVisible({
    timeout: 15_000,
  });
  // Give any straggling stale response time to land, then confirm the new
  // comparison is still on screen.
  await page.waitForTimeout(1500);
  await expect(page.getByRole('heading', { name: 'At a glance' }).first()).toBeVisible();
  await expect(page.getByRole('heading', { name: 'Explore trends' }).first()).toBeVisible();
  await expect(page.locator(`a[href*="${p0}"]`).first()).toBeVisible();
});

test('compare chart on mobile shows school chips with tap-to-focus', async ({ page }) => {
  await page.setViewportSize({ width: 390, height: 844 });

  await searchByName(page, 'primary');
  await expect(schoolLinks(page).first()).toBeVisible({ timeout: 15_000 });
  const hrefs = await schoolLinks(page).evaluateAll((links) =>
    links.map((l) => (l as HTMLAnchorElement).getAttribute('href') || '')
  );
  const urns = [...new Set(hrefs.map((h) => h.match(/\/school\/(\d+)/)?.[1]).filter(Boolean))];
  // Compare three schools, not two: a "primary" search can return all-through
  // schools that classify as secondary, and the chips only appear for the
  // active phase. With three schools across two phases, the auto-selected
  // majority phase always holds ≥2, so the chip legend is guaranteed to render.
  expect(urns.length).toBeGreaterThanOrEqual(3);

  await page.goto(`/compare?urns=${urns[0]},${urns[1]},${urns[2]}`);

  // Mobile is measure-first: the At a glance section stacks all active-phase
  // schools inside one flow — no horizontal swiping between school columns.
  await expect(
    page.getByRole('heading', { name: 'At a glance' }),
  ).toBeVisible({ timeout: 15_000 });
  const body = page.locator('body');
  const bodyOverflowsX = await body.evaluate(
    (el) => el.scrollWidth > el.clientWidth + 1,
  );
  expect(bodyOverflowsX).toBe(false);

  // The sticky school bar must pin *below* the sticky site header, not at
  // top:0 where the header covers it and the selected schools are hidden.
  // Assert the sticky offset directly (robust — no scroll timing needed).
  const barTop = await page
    .locator('[class*="schoolBar"]')
    .first()
    .evaluate((el) => parseFloat(getComputedStyle(el).top));
  const headerHeight = await page
    .locator('[class*="header"]')
    .first()
    .evaluate((el) => el.getBoundingClientRect().height);
  expect(barTop).toBeGreaterThanOrEqual(headerHeight - 1);

  // The trends chart still renders (inside the Explore trends section)…
  const chartCanvas = page.locator('canvas:visible').first();
  await expect(chartCanvas).toBeVisible({ timeout: 15_000 });
  // …at a real height, not the squashed ~150px Chart.js fallback that
  // appears when the container lacks a definite height.
  const chartBox = await chartCanvas.boundingBox();
  expect(chartBox && chartBox.height).toBeGreaterThan(220);

  // …with the mobile chart legend chips and tap-to-focus behaviour intact.
  const chipGroup = page.getByRole('group', { name: /highlight a school/i });
  const chips = chipGroup.getByRole('button');
  await expect(chips.first()).toBeVisible({ timeout: 15_000 });
  expect(await chips.count()).toBeGreaterThanOrEqual(2);

  // Tapping a chip focuses that school's line; tapping again releases it.
  await chips.first().click();
  await expect(chips.first()).toHaveAttribute('aria-pressed', 'true');
  await chips.first().click();
  await expect(chips.first()).toHaveAttribute('aria-pressed', 'false');
});

test('admissions guide renders its key milestones', async ({ page }) => {
  // Static content page — assert the guide loads and the load-bearing
  // milestones parents rely on are present (dates are statutory, so these
  // strings are stable invariants, not data-refresh-sensitive).
  await page.goto('/admissions');
  await expect(page.getByRole('heading', { name: /School Admissions Guide/i })).toBeVisible();
  await expect(page.getByRole('heading', { name: /Primary school admissions/i })).toBeVisible();
  await expect(page.getByRole('heading', { name: /Secondary school admissions/i })).toBeVisible();
  // National Offer Day is the milestone the whole guide builds toward.
  await expect(page.getByText(/National Offer Day/i).first()).toBeVisible();
});

test('rankings page loads a populated table', async ({ page }) => {
  await page.goto('/rankings');
  await expect(page.getByRole('heading', { name: /rankings/i }).first()).toBeVisible();
  const rows = page.locator('table tbody tr');
  await expect(rows.first()).toBeVisible({ timeout: 15_000 });
  expect(await rows.count()).toBeGreaterThan(5);
});

test('rankings stay populated after picking a specific year', async ({ page }) => {
  // Years are academic-year codes (e.g. 201819); the API must accept them
  // as the `year` query param rather than rejecting with a 422.
  await page.goto('/rankings');
  const yearSelect = page.locator('#year-select');
  await expect(yearSelect).toBeVisible({ timeout: 15_000 });

  // Pick the last option — the most recent explicit year. The default view
  // already proved this year has rows, so an empty table after selecting it
  // can only mean the year param was rejected. (The oldest year is no good
  // here: staging doesn't always carry the full data history.)
  const yearValue = await yearSelect.locator('option').last().getAttribute('value');
  expect(yearValue).toBeTruthy();
  await yearSelect.selectOption(yearValue!);
  await page.waitForURL(/year=/);

  const rows = page.locator('table tbody tr');
  await expect(rows.first()).toBeVisible({ timeout: 15_000 });
  expect(await rows.count()).toBeGreaterThan(5);
});

test('compare metric-help popover stays within the mobile viewport', async ({ page }) => {
  await page.setViewportSize({ width: 390, height: 844 });
  const [urn0, urn1] = await twoPrimaryUrns(page);
  await page.goto(`/compare?urns=${urn0},${urn1}`);

  await expect(
    page.getByRole('heading', { name: 'At a glance' }),
  ).toBeVisible({ timeout: 15_000 });

  // The metric-help triggers are the circled-"?" buttons in the row labels.
  // "More information" is InfoPopover's default accessible name.
  const help = page.getByRole('button', { name: 'More information' }).first();
  await expect(help).toBeVisible({ timeout: 15_000 });
  await help.click();

  const tip = page.getByRole('tooltip');
  await expect(tip).toBeVisible();

  // The whole bubble must sit inside the viewport — the original bug pushed it
  // off the right edge with no way to scroll to it.
  const box = await tip.boundingBox();
  const width = page.viewportSize()!.width;
  expect(box).not.toBeNull();
  expect(box!.x).toBeGreaterThanOrEqual(0);
  expect(box!.x + box!.width).toBeLessThanOrEqual(width);

  // And the page must not have gained a horizontal scrollbar from the bubble.
  const bodyOverflowsX = await page
    .locator('body')
    .evaluate((el) => el.scrollWidth > el.clientWidth + 1);
  expect(bodyOverflowsX).toBe(false);
});