1 files changed, 73 insertions, 0 deletions
diff --git a/cli/tests/unit/read_link_test.ts b/cli/tests/unit/read_link_test.ts
new file mode 100644
index 000000000..6821d8dc8
--- /dev/null
+++ b/cli/tests/unit/read_link_test.ts
@@ -0,0 +1,73 @@
+// 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 !== "windows") {
+      Deno.symlinkSync(target, symlink);
+      const targetPath = Deno.readLinkSync(symlink);
+      assertEquals(targetPath, target);
+    }
+  }
+);
+
+unitTest({ perms: { read: false } }, function readLinkSyncPerm(): 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 !== "windows") {
+      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);
+});