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+// Copyright (c) 2026 ObjectStack. Licensed under the Apache-2.0 license.
+
+/**
+ * Pin: `translateView` localizes a served FORM view's `sections` — each
+ * section's `label` and `description` — through
+ * `objects.<object>._sections.<name>`, on the shared locale chain and under
+ * the same catalog-vs-explicit-override rule as every other string the view
+ * translator overlays (ADR-0029 D9.2a).
+ *
+ * Before this, `TranslationDataSchema` declared the key, the i18n extractor
+ * scaffolded it and objectui's form renderers resolved it client-side, but no
+ * exported resolver read it: a server-side reader that has to translate on the
+ * caller's behalf — the anonymous public form, whose visitor cannot load the
+ * bundle — served every section heading as authored, beside translated field
+ * labels.
+ *
+ * The served documents below are what `expandViewContainer` emits from an
+ * authored container (the composer the registrars run), and both the
+ * container and the bundle's object node are PARSED by the authoring schemas,
+ * so a section address or a catalog key neither schema carries cannot pass.
+ */
+
+import { describe, it, expect } from 'vitest';
+import { translateView, translateMetadataDocument } from './i18n-resolver';
+import { ObjectTranslationDataSchema, type TranslationBundle } from './translation.zod';
+import { ViewSchema, expandViewContainer } from '../ui/view.zod';
+
+const clone = <T,>(v: T): T => JSON.parse(JSON.stringify(v));
+
+/** The container as the package ships it. */
+const CONTAINER = {
+  form: {
+    type: 'simple' as const,
+    data: { provider: 'object' as const, object: 'crm_lead' },
+    sections: [
+      { name: 'basics', label: 'Basics', description: 'Who is asking', fields: ['name'] },
+      // No bundle entry — the negative control for a missing key.
+      { name: 'notes', label: 'Notes', description: 'Anything else', fields: ['note'] },
+      // No `name`: no `_sections` key, whatever the bundle carries — including a
+      // key equal to the slug of its label, which must NOT be read.
+      { label: 'Contact Details', description: 'How to reach them', fields: ['email'] },
+      // Named, but authors neither a heading nor a description.
+      { name: 'extra', fields: ['phone'] },
+    ],
+  },
+  formViews: {
+    // Retargeted at another object: its sections key under the form's OWN
+    // binding, the object the extractor and the linter bind them to.
+    referral: {
+      type: 'simple' as const,
+      data: { provider: 'object' as const, object: 'crm_contact' },
+      sections: [{ name: 'basics', label: 'Basics', fields: ['name'] }],
+    },
+  },
+};
+
+const served = (name: string): any => {
+  const item = expandViewContainer('crm_lead', CONTAINER).find((v) => v.name === name);
+  if (!item) throw new Error(`fixture missing ${name}`);
+  return item;
+};
+const PACKAGED = served('crm_lead.form');
+
+const LEAD_ZH = {
+  _sections: {
+    basics: { label: '基本信息', description: '咨询人是谁' },
+    contact_details: { label: 'MUST-NOT-APPLY', description: 'MUST-NOT-APPLY' },
+    extra: { label: 'MUST-NOT-APPLY', description: 'MUST-NOT-APPLY' },
+  },
+};
+const LEAD_EN = {
+  _sections: { basics: { label: 'Basics', description: 'Who is asking' } },
+};
+const CONTACT_ZH = {
+  _sections: { basics: { label: '联系人基本信息' } },
+};
+
+const BUNDLE: TranslationBundle = {
+  en: { objects: { crm_lead: LEAD_EN } } as any,
+  'zh-CN': { objects: { crm_lead: LEAD_ZH, crm_contact: CONTACT_ZH } } as any,
+};
+
+const section = (view: any, name: string): any => view.config.sections.find((s: any) => s.name === name);
+
+describe('translateView — a form view\'s sections, keyed under `_sections`', () => {
+  it('composes the identity this test is pinned to — legal fixtures, sections live under `config`', () => {
+    expect(ViewSchema.safeParse(CONTAINER).success).toBe(true);
+    for (const node of [LEAD_ZH, LEAD_EN, CONTACT_ZH]) {
+      expect(ObjectTranslationDataSchema.safeParse(node).success).toBe(true);
+    }
+    expect(PACKAGED.viewKind).toBe('form');
+    expect(PACKAGED.object).toBe('crm_lead');
+    expect(PACKAGED.sections).toBeUndefined();
+    expect(PACKAGED.config.sections.map((s: any) => s.name)).toEqual(['basics', 'notes', undefined, 'extra']);
+  });
+
+  it('a zh-CN pack with a `_sections` key yields the translated label and description', () => {
+    const out = translateMetadataDocument('view', clone(PACKAGED), BUNDLE, { locale: 'zh-CN' });
+    expect(section(out, 'basics')).toMatchObject({ label: '基本信息', description: '咨询人是谁', fields: ['name'] });
+  });
+
+  it('a missing key yields the authored text', () => {
+    const out = translateMetadataDocument('view', clone(PACKAGED), BUNDLE, { locale: 'zh-CN' });
+    expect(section(out, 'notes')).toEqual(PACKAGED.config.sections[1]);
+    // A key that carries a label but no description leaves the description as authored.
+    const label = translateMetadataDocument('view', clone(served('crm_lead.referral')), BUNDLE, { locale: 'zh-CN' });
+    expect(section(label, 'basics').label).toBe('联系人基本信息');
+    expect(section(label, 'basics').description).toBeUndefined();
+  });
+
+  it('a section with no `name` is left as authored — it has no key, and its label is never slugged into one', () => {
+    const doc = clone(PACKAGED);
+    const out = translateView(doc, BUNDLE, { locale: 'zh-CN' }) as any;
+    expect(out.config.sections[2]).toBe(doc.config.sections[2]);
+    expect(out.config.sections[2]).toMatchObject({ label: 'Contact Details', description: 'How to reach them' });
+  });
+
+  it('the catalog translates authored copy only — it never adds a heading or a description', () => {
+    const out = translateView(clone(PACKAGED), BUNDLE, { locale: 'zh-CN' }) as any;
+    expect(section(out, 'extra').label).toBeUndefined();
+    expect(section(out, 'extra').description).toBeUndefined();
+  });
+
+  it('an inline locale map heading is authored text and takes the catalog, as a view label does', () => {
+    const doc = clone(PACKAGED);
+    doc.config.sections[0].label = { en: 'Basics', 'zh-CN': '基础' };
+    const out = translateView(doc, BUNDLE, { locale: 'zh-CN' }) as any;
+    expect(section(out, 'basics').label).toBe('基本信息');
+  });
+
+  it('keys a retargeted form\'s sections under the form\'s own `data.object`', () => {
+    const referral = served('crm_lead.referral');
+    expect(referral.object).toBe('crm_lead');
+    const out = translateView(clone(referral), BUNDLE, { locale: 'zh-CN' }) as any;
+    // `crm_lead._sections.basics` would read 基本信息; the form binds crm_contact.
+    expect(section(out, 'basics').label).toBe('联系人基本信息');
+  });
+
+  it('walks the shared locale chain — BCP-47 ladder, declared fallback chain, default locale', () => {
+    expect(section(translateView(clone(PACKAGED), BUNDLE, { locale: 'zh' }), 'basics').label).toBe('基本信息');
+    const viaChain = translateView(clone(PACKAGED), BUNDLE, { locale: 'fr-FR', fallbackChain: ['zh-CN'] });
+    expect(section(viaChain, 'basics').label).toBe('基本信息');
+    // A request for the default locale never walks the chain: the authored text answers.
+    const asDefault = translateView(clone(PACKAGED), BUNDLE, {
+      locale: 'fr-FR', defaultLocale: 'fr-FR', fallbackChain: ['zh-CN'],
+    });
+    expect(section(asDefault, 'basics').label).toBe('Basics');
+  });
+
+  it('returns the SAME `config` reference when no section gained a translation, and never mutates its input', () => {
+    const doc = clone(PACKAGED);
+    expect((translateView(doc, { 'ja-JP': {} }, { locale: 'ja-JP' }) as any).config).toBe(doc.config);
+    const before = clone(doc);
+    translateView(doc, BUNDLE, { locale: 'zh-CN' });
+    expect(doc).toEqual(before);
+  });
+});
+
+describe('translateView — a form section\'s copy loses to an explicit override (ADR-0029 D9.2a)', () => {
+  it('an unedited form view gets the catalog for every section string', () => {
+    const out = translateView(clone(PACKAGED), BUNDLE, { locale: 'zh-CN', packagedBase: PACKAGED });
+    expect(section(out, 'basics')).toMatchObject({ label: '基本信息', description: '咨询人是谁' });
+  });
+
+  it('an edited heading is served as edited — in zh-CN and in the source locale — and judged apart from its description', () => {
+    const doc = clone(PACKAGED);
+    doc.config.sections[0].label = 'Basics (edited)';
+    for (const locale of ['zh-CN', 'en']) {
+      const out = translateView(doc, BUNDLE, { locale, packagedBase: PACKAGED });
+      expect(section(out, 'basics').label, locale).toBe('Basics (edited)');
+    }
+    expect(section(translateView(doc, BUNDLE, { locale: 'zh-CN', packagedBase: PACKAGED }), 'basics').description)
+      .toBe('咨询人是谁');
+  });
+
+  it('a section the package does not ship was authored after the fact and keeps its strings', () => {
+    const doc = clone(PACKAGED);
+    doc.config.sections[0].name = 'contact_details';
+    doc.config.sections[0].label = 'Added by the org';
+    const out = translateView(doc, BUNDLE, { locale: 'zh-CN', packagedBase: PACKAGED });
+    expect(section(out, 'contact_details').label).toBe('Added by the org');
+  });
+
+  it('NO packaged base supplied → the catalog applies (the control)', () => {
+    const doc = clone(PACKAGED);
+    doc.config.sections[0].label = 'Basics (edited)';
+    expect(section(translateView(doc, BUNDLE, { locale: 'zh-CN' }), 'basics').label).toBe('基本信息');
+  });
+});