1 files changed, 99 insertions, 0 deletions
diff --git a/tests/unit/read_link_test.ts b/tests/unit/read_link_test.ts
new file mode 100644
index 000000000..3ed1817bb
--- /dev/null
+++ b/tests/unit/read_link_test.ts
@@ -0,0 +1,99 @@
+// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
+import {
+  assertEquals,
+  assertRejects,
+  assertThrows,
+  pathToAbsoluteFileUrl,
+} from "./test_util.ts";
+
+Deno.test(
+  { permissions: { write: true, read: true } },
+  function readLinkSyncSuccess() {
+    const testDir = Deno.makeTempDirSync();
+    const target = testDir +
+      (Deno.build.os == "windows" ? "\\target" : "/target");
+    const symlink = testDir +
+      (Deno.build.os == "windows" ? "\\symlink" : "/symlink");
+    Deno.mkdirSync(target);
+    Deno.symlinkSync(target, symlink);
+    const targetPath = Deno.readLinkSync(symlink);
+    assertEquals(targetPath, target);
+  },
+);
+
+Deno.test(
+  { permissions: { write: true, read: true } },
+  function readLinkSyncUrlSuccess() {
+    const testDir = Deno.makeTempDirSync();
+    const target = testDir +
+      (Deno.build.os == "windows" ? "\\target" : "/target");
+    const symlink = testDir +
+      (Deno.build.os == "windows" ? "\\symlink" : "/symlink");
+    Deno.mkdirSync(target);
+    Deno.symlinkSync(target, symlink);
+    const targetPath = Deno.readLinkSync(pathToAbsoluteFileUrl(symlink));
+    assertEquals(targetPath, target);
+  },
+);
+
+Deno.test({ permissions: { read: false } }, function readLinkSyncPerm() {
+  assertThrows(() => {
+    Deno.readLinkSync("/symlink");
+  }, Deno.errors.PermissionDenied);
+});
+
+Deno.test({ permissions: { read: true } }, function readLinkSyncNotFound() {
+  assertThrows(
+    () => {
+      Deno.readLinkSync("bad_filename");
+    },
+    Deno.errors.NotFound,
+    `readlink 'bad_filename'`,
+  );
+});
+
+Deno.test(
+  { permissions: { write: true, read: true } },
+  async function readLinkSuccess() {
+    const testDir = Deno.makeTempDirSync();
+    const target = testDir +
+      (Deno.build.os == "windows" ? "\\target" : "/target");
+    const symlink = testDir +
+      (Deno.build.os == "windows" ? "\\symlink" : "/symlink");
+    Deno.mkdirSync(target);
+    Deno.symlinkSync(target, symlink);
+    const targetPath = await Deno.readLink(symlink);
+    assertEquals(targetPath, target);
+  },
+);
+
+Deno.test(
+  { permissions: { write: true, read: true } },
+  async function readLinkUrlSuccess() {
+    const testDir = Deno.makeTempDirSync();
+    const target = testDir +
+      (Deno.build.os == "windows" ? "\\target" : "/target");
+    const symlink = testDir +
+      (Deno.build.os == "windows" ? "\\symlink" : "/symlink");
+    Deno.mkdirSync(target);
+    Deno.symlinkSync(target, symlink);
+    const targetPath = await Deno.readLink(pathToAbsoluteFileUrl(symlink));
+    assertEquals(targetPath, target);
+  },
+);
+
+Deno.test({ permissions: { read: false } }, async function readLinkPerm() {
+  await assertRejects(async () => {
+    await Deno.readLink("/symlink");
+  }, Deno.errors.PermissionDenied);
+});
+
+Deno.test({ permissions: { read: true } }, async function readLinkNotFound() {
+  await assertRejects(
+    async () => {
+      await Deno.readLink("bad_filename");
+    },
+    Deno.errors.NotFound,
+    `readlink 'bad_filename'`,
+  );
+});