denoland-deno/cli/tests/unit/sync_test.ts

// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
import { unitTest, assertEquals } from "./test_util.ts";

unitTest(
  { perms: { read: true, write: true } },
  function fsyncSyncSuccess(): void {
    const filename = Deno.makeTempDirSync() + "/test_fsyncSync.txt";
    const file = Deno.openSync(filename, {
      read: true,
      write: true,
      create: true,
    });
    const size = 64;
    Deno.ftruncateSync(file.rid, size);
    Deno.fsyncSync(file.rid);
    assertEquals(Deno.statSync(filename).size, size);
    Deno.close(file.rid);
    Deno.removeSync(filename);
  }
);

unitTest(
  { perms: { read: true, write: true } },
  async function fsyncSuccess(): Promise<void> {
    const filename = (await Deno.makeTempDir()) + "/test_fsync.txt";
    const file = await Deno.open(filename, {
      read: true,
      write: true,
      create: true,
    });
    const size = 64;
    await Deno.ftruncate(file.rid, size);
    await Deno.fsync(file.rid);
    assertEquals((await Deno.stat(filename)).size, size);
    Deno.close(file.rid);
    await Deno.remove(filename);
  }
);