Initial rebrand: @polkadot -> @pezkuwi (14 packages)

- Package namespace: @polkadot/* -> @pezkuwi/*
- Repository: polkadot-js/common -> pezkuwichain/pezkuwi-common
- Author: Pezkuwi Team <team@pezkuwichain.io>

Core packages:
- @pezkuwi/util (utilities)
- @pezkuwi/util-crypto (crypto primitives)
- @pezkuwi/keyring (account management)
- @pezkuwi/networks (chain metadata)
- @pezkuwi/hw-ledger (Ledger hardware wallet)
- @pezkuwi/x-* (10 polyfill packages)

Total: 14 packages
Upstream: polkadot-js/common v14.0.1

packages/util/src/u8a/toString.spec.ts

@@ -0,0 +1,36 @@
+// Copyright 2017-2025 @polkadot/util authors & contributors
+// SPDX-License-Identifier: Apache-2.0
+
+/// <reference types="@polkadot/dev-test/globals.d.ts" />
+
+import { u8aToString } from './index.js';
+
+describe('u8aToString', (): void => {
+  it('decodes to an empty string for undefined', (): void => {
+    expect(
+      u8aToString()
+    ).toEqual('');
+  });
+
+  it('decodes to an empty string for empty buffer', (): void => {
+    expect(
+      u8aToString(new Uint8Array())
+    ).toEqual('');
+  });
+
+  it('decodes the Uint8Array correctly (ru)', (): void => {
+    expect(
+      u8aToString(
+        new Uint8Array([208, 159, 209, 128, 208, 184, 208, 178, 208, 181, 209, 130, 44, 32, 208, 188, 208, 184, 209, 128, 33])
+      )
+    ).toEqual('Привет, мир!');
+  });
+
+  it('decodes the Uint8Array correctly (en)', (): void => {
+    expect(
+      u8aToString(
+        new Uint8Array([0x68, 0x65, 0x6c, 0x6c, 0x6f, 0x20, 0x77, 0x6f, 0x72, 0x6c, 0x64])
+      )
+    ).toEqual('hello world');
+  });
+});