1 files changed, 113 insertions, 0 deletions
diff --git a/tests/unit/read_dir_test.ts b/tests/unit/read_dir_test.ts
new file mode 100644
index 000000000..cba9647e5
--- /dev/null
+++ b/tests/unit/read_dir_test.ts
@@ -0,0 +1,113 @@
+// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
+import {
+  assert,
+  assertEquals,
+  assertRejects,
+  assertThrows,
+  pathToAbsoluteFileUrl,
+} from "./test_util.ts";
+
+function assertSameContent(files: Deno.DirEntry[]) {
+  let counter = 0;
+
+  for (const entry of files) {
+    if (entry.name === "subdir") {
+      assert(entry.isDirectory);
+      counter++;
+    }
+  }
+
+  assertEquals(counter, 1);
+}
+
+Deno.test({ permissions: { read: true } }, function readDirSyncSuccess() {
+  const files = [...Deno.readDirSync("tests/testdata")];
+  assertSameContent(files);
+});
+
+Deno.test({ permissions: { read: true } }, function readDirSyncWithUrl() {
+  const files = [
+    ...Deno.readDirSync(pathToAbsoluteFileUrl("tests/testdata")),
+  ];
+  assertSameContent(files);
+});
+
+Deno.test({ permissions: { read: false } }, function readDirSyncPerm() {
+  assertThrows(() => {
+    Deno.readDirSync("tests/");
+  }, Deno.errors.PermissionDenied);
+});
+
+Deno.test({ permissions: { read: true } }, function readDirSyncNotDir() {
+  assertThrows(
+    () => {
+      Deno.readDirSync("tests/testdata/assets/fixture.json");
+    },
+    Error,
+    `readdir 'tests/testdata/assets/fixture.json'`,
+  );
+});
+
+Deno.test({ permissions: { read: true } }, function readDirSyncNotFound() {
+  assertThrows(
+    () => {
+      Deno.readDirSync("bad_dir_name");
+    },
+    Deno.errors.NotFound,
+    `readdir 'bad_dir_name'`,
+  );
+});
+
+Deno.test({ permissions: { read: true } }, async function readDirSuccess() {
+  const files = [];
+  for await (const dirEntry of Deno.readDir("tests/testdata")) {
+    files.push(dirEntry);
+  }
+  assertSameContent(files);
+});
+
+Deno.test({ permissions: { read: true } }, async function readDirWithUrl() {
+  const files = [];
+  for await (
+    const dirEntry of Deno.readDir(pathToAbsoluteFileUrl("tests/testdata"))
+  ) {
+    files.push(dirEntry);
+  }
+  assertSameContent(files);
+});
+
+Deno.test({ permissions: { read: false } }, async function readDirPerm() {
+  await assertRejects(async () => {
+    await Deno.readDir("tests/")[Symbol.asyncIterator]().next();
+  }, Deno.errors.PermissionDenied);
+});
+
+Deno.test(
+  { permissions: { read: true }, ignore: Deno.build.os == "windows" },
+  async function readDirDevFd(): Promise<
+    void
+  > {
+    for await (const _ of Deno.readDir("/dev/fd")) {
+      // We don't actually care whats in here; just that we don't panic on non regular entries
+    }
+  },
+);
+
+Deno.test(
+  { permissions: { read: true }, ignore: Deno.build.os == "windows" },
+  function readDirDevFdSync() {
+    for (const _ of Deno.readDirSync("/dev/fd")) {
+      // We don't actually care whats in here; just that we don't panic on non regular file entries
+    }
+  },
+);
+
+Deno.test({ permissions: { read: true } }, async function readDirNotFound() {
+  await assertRejects(
+    async () => {
+      await Deno.readDir("bad_dir_name")[Symbol.asyncIterator]().next();
+    },
+    Deno.errors.NotFound,
+    `readdir 'bad_dir_name'`,
+  );
+});