Implement deno.readlink() (#797)

1 files changed, 44 insertions, 0 deletions

diff --git a/js/read_link_test.ts b/js/read_link_test.ts
new file mode 100644
index 000000000..2df6b30d0
--- /dev/null
+++ b/js/read_link_test.ts
@@ -0,0 +1,44 @@
+// Copyright 2018 the Deno authors. All rights reserved. MIT license.
+import { test, testPerm, assert, assertEqual } from "./test_util.ts";
+import * as deno from "deno";
+
+testPerm({ write: true }, function readlinkSyncSuccess() {
+  const testDir = deno.makeTempDirSync() + "/test-readlink-sync";
+  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.platform !== "win32") {
+    deno.symlinkSync(target, symlink);
+    const targetPath = deno.readlinkSync(symlink);
+    assertEqual(targetPath, target);
+  }
+});
+
+test(function readlinkSyncNotFound() {
+  let caughtError = false;
+  let data;
+  try {
+    data = deno.readlinkSync("bad_filename");
+  } catch (e) {
+    caughtError = true;
+    assertEqual(e.kind, deno.ErrorKind.NotFound);
+  }
+  assert(caughtError);
+  assertEqual(data, undefined);
+});
+
+testPerm({ write: true }, async function readlinkSuccess() {
+  const testDir = deno.makeTempDirSync() + "/test-readlink";
+  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.platform !== "win32") {
+    deno.symlinkSync(target, symlink);
+    const targetPath = await deno.readlink(symlink);
+    assertEqual(targetPath, target);
+  }
+});