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apps/backend/src/routes/pages.localization.test.ts

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+import { describe, expect, test } from "bun:test";
+import {
+  mergeSectionTranslations,
+  transformLocalizedPaths,
+} from "./pages";
+
+describe("Page section localization", () => {
+  const paths = ["title", "items[].title", "items[].note"];
+  const payload = {
+    title: { th: "เอกสารอ้างอิง", en: "References" },
+    items: [{
+      title: { th: "เทคโนโลยีไฟน์แบลงก์", en: "Fine blanking technology" },
+      note: { th: "ข้อมูลทางเทคนิค" },
+      url: "https://example.com/reference",
+    }],
+    variant: "numbered",
+  };
+
+  test("resolves only the requested language and reports missing nested fields", () => {
+    const result = transformLocalizedPaths(payload, paths, "zh", false);
+
+    expect(result.payload).toEqual({
+      title: null,
+      items: [{
+        title: null,
+        note: null,
+        url: "https://example.com/reference",
+      }],
+      variant: "numbered",
+    });
+    expect(result.fallbackPaths).toEqual([
+      "title",
+      "items[0].title",
+      "items[0].note",
+    ]);
+  });
+
+  test("merges one language while preserving other languages and configuration", () => {
+    const result = mergeSectionTranslations(payload, {
+      title: "参考资料",
+      items: [{
+        title: "精密冲裁技术",
+        note: "技术资料",
+      }],
+    }, paths, "zh");
+
+    expect(result.payload).toEqual({
+      title: { th: "เอกสารอ้างอิง", en: "References", zh: "参考资料" },
+      items: [{
+        title: {
+          th: "เทคโนโลยีไฟน์แบลงก์",
+          en: "Fine blanking technology",
+          zh: "精密冲裁技术",
+        },
+        note: { th: "ข้อมูลทางเทคนิค", zh: "技术资料" },
+        url: "https://example.com/reference",
+      }],
+      variant: "numbered",
+    });
+    expect(result.translatedPaths).toEqual([
+      "title",
+      "items[0].title",
+      "items[0].note",
+    ]);
+  });
+
+  test("rejects an array shape that cannot be merged safely", () => {
+    expect(() => mergeSectionTranslations(payload, {
+      items: [],
+    }, paths, "zh")).toThrow("Translation array shape mismatch at items");
+  });
+});