Some bip39-en cleanups (& tests) (#1295)

packages/util-crypto/src/mnemonic/bip39.spec.ts

@@ -0,0 +1,14 @@
+// Copyright 2017-2021 @polkadot/util-crypto authors & contributors
+// SPDX-License-Identifier: Apache-2.0
+
+import DEFAULT_WORDLIST from './bip39-en';
+
+describe('wordlist', (): void => {
+  it('has the correct number of words', (): void => {
+    expect(DEFAULT_WORDLIST).toHaveLength(2048);
+  });
+
+  it('has no empty words', (): void => {
+    expect(DEFAULT_WORDLIST.some((n) => !n.length || n.trim() !== n)).toEqual(false);
+  });
+});