1 files changed, 75 insertions, 0 deletions
diff --git a/cli/js/tests/read_link_test.ts b/cli/js/tests/read_link_test.ts
new file mode 100644
index 000000000..409f37110
--- /dev/null
+++ b/cli/js/tests/read_link_test.ts
@@ -0,0 +1,75 @@
+// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
+import { unitTest, assert, assertEquals } from "./test_util.ts";
+
+unitTest(
+  { perms: { 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);
+    }
+  }
+);
+
+unitTest({ perms: { read: false } }, async function readlinkSyncPerm(): Promise<
+  void
+> {
+  let caughtError = false;
+  try {
+    Deno.readlinkSync("/symlink");
+  } catch (e) {
+    caughtError = true;
+    assert(e instanceof Deno.errors.PermissionDenied);
+  }
+  assert(caughtError);
+});
+
+unitTest({ perms: { read: true } }, function readlinkSyncNotFound(): void {
+  let caughtError = false;
+  let data;
+  try {
+    data = Deno.readlinkSync("bad_filename");
+  } catch (e) {
+    caughtError = true;
+    assert(e instanceof Deno.errors.NotFound);
+  }
+  assert(caughtError);
+  assertEquals(data, undefined);
+});
+
+unitTest(
+  { perms: { 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);
+    }
+  }
+);
+
+unitTest({ perms: { read: false } }, async function readlinkPerm(): Promise<
+  void
+> {
+  let caughtError = false;
+  try {
+    await Deno.readlink("/symlink");
+  } catch (e) {
+    caughtError = true;
+    assert(e instanceof Deno.errors.PermissionDenied);
+  }
+  assert(caughtError);
+});