test(ext/node): port _fs tests from std/node (#18262)

Co-authored-by: Yoshiya Hinosawa <stibium121@gmail.com>

1 files changed, 78 insertions, 0 deletions

diff --git a/cli/tests/unit_node/_fs/_fs_readlink_test.ts b/cli/tests/unit_node/_fs/_fs_readlink_test.ts
new file mode 100644
index 000000000..7f0d3cef8
--- /dev/null
+++ b/cli/tests/unit_node/_fs/_fs_readlink_test.ts
@@ -0,0 +1,78 @@
+// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
+import { assertCallbackErrorUncaught } from "../_test_utils.ts";
+import { readlink, readlinkSync } from "node:fs";
+import {
+  assert,
+  assertEquals,
+} from "../../../../test_util/std/testing/asserts.ts";
+import * as path from "../../../../test_util/std/path/mod.ts";
+
+const testDir = Deno.makeTempDirSync();
+const oldname = path.join(testDir, "oldname");
+const newname = path.join(testDir, "newname");
+
+if (Deno.build.os === "windows") {
+  Deno.symlinkSync(oldname, newname, { type: "file" });
+} else {
+  Deno.symlinkSync(oldname, newname);
+}
+
+Deno.test({
+  name: "readlinkSuccess",
+  async fn() {
+    const data = await new Promise((res, rej) => {
+      readlink(newname, (err, data) => {
+        if (err) {
+          rej(err);
+        }
+        res(data);
+      });
+    });
+
+    assertEquals(typeof data, "string");
+    assertEquals(data as string, oldname);
+  },
+});
+
+Deno.test({
+  name: "readlinkEncodeBufferSuccess",
+  async fn() {
+    const data = await new Promise((res, rej) => {
+      readlink(newname, { encoding: "buffer" }, (err, data) => {
+        if (err) {
+          rej(err);
+        }
+        res(data);
+      });
+    });
+
+    assert(data instanceof Uint8Array);
+    assertEquals(new TextDecoder().decode(data as Uint8Array), oldname);
+  },
+});
+
+Deno.test({
+  name: "readlinkSyncSuccess",
+  fn() {
+    const data = readlinkSync(newname);
+    assertEquals(typeof data, "string");
+    assertEquals(data as string, oldname);
+  },
+});
+
+Deno.test({
+  name: "readlinkEncodeBufferSuccess",
+  fn() {
+    const data = readlinkSync(newname, { encoding: "buffer" });
+    assert(data instanceof Uint8Array);
+    assertEquals(new TextDecoder().decode(data as Uint8Array), oldname);
+  },
+});
+
+Deno.test("[std/node/fs] readlink callback isn't called twice if error is thrown", async () => {
+  const importUrl = new URL("node:fs", import.meta.url);
+  await assertCallbackErrorUncaught({
+    prelude: `import { readlink } from ${JSON.stringify(importUrl)}`,
+    invocation: `readlink(${JSON.stringify(newname)}, `,
+  });
+});