denoland-deno/cli/js/read_link_test.ts

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

testPerm({ write: true, read: true }, function readlinkSyncSuccess(): void {
  const testDir = Deno.makeTempDirSync();
  const target = testDir + "/target";
  const symlink = testDir + "/symln";
  Deno.mkdirSync(target);
  // TODO Add test for Windows once symlink is implemented for Windows.
  // See https://github.com/denoland/deno/issues/815.
  if (Deno.build.os !== "win") {
    Deno.symlinkSync(target, symlink);
    const targetPath = Deno.readlinkSync(symlink);
    assertEquals(targetPath, target);
  }
});

testPerm({ read: false }, async function readlinkSyncPerm(): Promise<void> {
  let caughtError = false;
  try {
    Deno.readlinkSync("/symlink");
  } catch (e) {
    caughtError = true;
    assert(e instanceof Deno.Err.PermissionDenied);
  }
  assert(caughtError);
});

testPerm({ read: true }, function readlinkSyncNotFound(): void {
  let caughtError = false;
  let data;
  try {
    data = Deno.readlinkSync("bad_filename");
  } catch (e) {
    caughtError = true;
    assert(e instanceof Deno.Err.NotFound);
  }
  assert(caughtError);
  assertEquals(data, undefined);
});

testPerm({ write: true, read: true }, async function readlinkSuccess(): Promise<
  void
> {
  const testDir = Deno.makeTempDirSync();
  const target = testDir + "/target";
  const symlink = testDir + "/symln";
  Deno.mkdirSync(target);
  // TODO Add test for Windows once symlink is implemented for Windows.
  // See https://github.com/denoland/deno/issues/815.
  if (Deno.build.os !== "win") {
    Deno.symlinkSync(target, symlink);
    const targetPath = await Deno.readlink(symlink);
    assertEquals(targetPath, target);
  }
});

testPerm({ read: false }, async function readlinkPerm(): Promise<void> {
  let caughtError = false;
  try {
    await Deno.readlink("/symlink");
  } catch (e) {
    caughtError = true;
    assert(e instanceof Deno.Err.PermissionDenied);
  }
  assert(caughtError);
});