reverse-engineering-anything/tests/boundary/filesystem/jsonUtf8Input.test.ts

import { writeFile } from "node:fs/promises";
import { join } from "node:path";
import { describe, expect, it } from "vitest";
import { readJsonFile } from "../../../src/application/JsonFiles.js";
import { parseCliJsonInput } from "../../../src/cliJsonInput.js";
import { createTestTempDirectory } from "../../fixtures/temporaryDirectory.js";
describe("JSON file UTF-8 byte integrity", () => {
  it.each([0x80, 0xe9, 0xff])(
    "rejects invalid UTF-8 byte %s through both file input boundaries",
    async (invalidByte) => {
      const root = await createTestTempDirectory("rea-json-utf8-");
      const path = join(root, "input.json");
      await writeFile(
        path,
        Buffer.concat([
          Buffer.from('{"message":"'),
          Buffer.from([invalidByte]),
          Buffer.from('"}'),
        ]),
      );
      const fileInput = await readJsonFile(path);
      const cliInput = await parseCliJsonInput(path, "compare_web_captures");
      expect(fileInput).toMatchObject({
        ok: false,
        error: { reason: "invalid-json" },
      });
      expect(cliInput).toMatchObject({
        ok: false,
        error: { input_reason: "invalid-json" },
      });
    },
  );
  it("preserves a legitimate UTF-8 replacement character", async () => {
    const root = await createTestTempDirectory("rea-json-utf8-control-");
    const path = join(root, "input.json");
    const value = { message: "valid � and é and 😀" };
    await writeFile(path, JSON.stringify(value), "utf8");
    const fileInput = await readJsonFile(path);
    const cliInput = await parseCliJsonInput(path, "compare_web_captures");
    expect(fileInput).toMatchObject({ ok: true, value });
    expect(cliInput).toMatchObject({ ok: true, value });
  });
});