1 files changed, 82 insertions, 0 deletions
diff --git a/cli/tests/unit/read_dir_test.ts b/cli/tests/unit/read_dir_test.ts
new file mode 100644
index 000000000..79e2a1507
--- /dev/null
+++ b/cli/tests/unit/read_dir_test.ts
@@ -0,0 +1,82 @@
+// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
+import { unitTest, assert, assertEquals } from "./test_util.ts";
+
+function assertSameContent(files: Deno.DirEntry[]): void {
+  let counter = 0;
+
+  for (const entry of files) {
+    if (entry.name === "subdir") {
+      assert(entry.isDirectory);
+      counter++;
+    }
+  }
+
+  assertEquals(counter, 1);
+}
+
+unitTest({ perms: { read: true } }, function readDirSyncSuccess(): void {
+  const files = [...Deno.readDirSync("cli/tests/")];
+  assertSameContent(files);
+});
+
+unitTest({ perms: { read: false } }, function readDirSyncPerm(): void {
+  let caughtError = false;
+  try {
+    Deno.readDirSync("tests/");
+  } catch (e) {
+    caughtError = true;
+    assert(e instanceof Deno.errors.PermissionDenied);
+  }
+  assert(caughtError);
+});
+
+unitTest({ perms: { read: true } }, function readDirSyncNotDir(): void {
+  let caughtError = false;
+  let src;
+
+  try {
+    src = Deno.readDirSync("cli/tests/fixture.json");
+  } catch (err) {
+    caughtError = true;
+    assert(err instanceof Error);
+  }
+  assert(caughtError);
+  assertEquals(src, undefined);
+});
+
+unitTest({ perms: { read: true } }, function readDirSyncNotFound(): void {
+  let caughtError = false;
+  let src;
+
+  try {
+    src = Deno.readDirSync("bad_dir_name");
+  } catch (err) {
+    caughtError = true;
+    assert(err instanceof Deno.errors.NotFound);
+  }
+  assert(caughtError);
+  assertEquals(src, undefined);
+});
+
+unitTest({ perms: { read: true } }, async function readDirSuccess(): Promise<
+  void
+> {
+  const files = [];
+  for await (const dirEntry of Deno.readDir("cli/tests/")) {
+    files.push(dirEntry);
+  }
+  assertSameContent(files);
+});
+
+unitTest({ perms: { read: false } }, async function readDirPerm(): Promise<
+  void
+> {
+  let caughtError = false;
+  try {
+    await Deno.readDir("tests/")[Symbol.asyncIterator]().next();
+  } catch (e) {
+    caughtError = true;
+    assert(e instanceof Deno.errors.PermissionDenied);
+  }
+  assert(caughtError);
+});