Reduce entropy usage in tests

When playing around with tests frameworks, it was noticed that noise
was using entropy that lead to handles remaining open at the end of the
test run.

src/lib/waku.spec.ts

@@ -1,5 +1,6 @@
 import { expect } from 'chai';
 
+import { NOISE_KEY_1 } from '../test_utils/constants';
 import { NimWaku } from '../test_utils/nim_waku';
 
 import Waku from './waku';
@@ -9,7 +10,7 @@ describe('Waku', function () {
   describe('Interop: Nim', function () {
     it('nim connects to js', async function () {
       this.timeout(10_000);
-      const waku = await Waku.create();
+      const waku = await Waku.create(NOISE_KEY_1);
 
       const peerId = waku.libp2p.peerId.toB58String();
 

src/lib/waku.ts

@@ -1,6 +1,7 @@
 import Libp2p from 'libp2p';
 import Mplex from 'libp2p-mplex';
-import { NOISE } from 'libp2p-noise';
+import { bytes } from 'libp2p-noise/dist/src/@types/basic';
+import { Noise } from 'libp2p-noise/dist/src/noise';
 import TCP from 'libp2p-tcp';
 
 import { WakuRelay, WakuRelayPubsub } from './waku_relay';
@@ -8,7 +9,13 @@ import { WakuRelay, WakuRelayPubsub } from './waku_relay';
 export default class Waku {
   private constructor(public libp2p: Libp2p, public relay: WakuRelay) {}
 
-  static async create(): Promise<Waku> {
+  /**
+   * Create new waku node
+   * @param staticNoiseKey: A static key to use for noise,
+   * mainly used for test to reduce entropy usage.
+   * @returns {Promise<Waku>}
+   */
+  static async create(staticNoiseKey?: bytes): Promise<Waku> {
     const libp2p = await Libp2p.create({
       addresses: {
         listen: ['/ip4/0.0.0.0/tcp/0'],
@@ -16,7 +23,7 @@ export default class Waku {
       modules: {
         transport: [TCP],
         streamMuxer: [Mplex],
-        connEncryption: [NOISE],
+        connEncryption: [new Noise(staticNoiseKey)],
         // eslint-disable-next-line @typescript-eslint/ban-ts-comment
         // @ts-ignore: Type needs update
         pubsub: WakuRelayPubsub,

src/lib/waku_relay.spec.ts

@@ -1,6 +1,7 @@
 import { expect } from 'chai';
 import Pubsub from 'libp2p-interfaces/src/pubsub';
 
+import { NOISE_KEY_1, NOISE_KEY_2 } from '../test_utils/constants';
 import { NimWaku } from '../test_utils/nim_waku';
 
 import Waku from './waku';
@@ -12,7 +13,10 @@ describe('Waku Relay', () => {
   it.skip('Publish', async () => {
     const message = Message.fromUtf8String('Bird bird bird, bird is the word!');
 
-    const [waku1, waku2] = await Promise.all([Waku.create(), Waku.create()]);
+    const [waku1, waku2] = await Promise.all([
+      Waku.create(NOISE_KEY_1),
+      Waku.create(NOISE_KEY_2),
+    ]);
 
     // Add node's 2 data to the PeerStore
     waku1.libp2p.peerStore.addressBook.set(
@@ -41,7 +45,7 @@ describe('Waku Relay', () => {
   });
 
   it('Registers waku relay protocol', async function () {
-    const waku = await Waku.create();
+    const waku = await Waku.create(NOISE_KEY_1);
 
     const protocols = Array.from(waku.libp2p.upgrader.protocols.keys());
 
@@ -51,7 +55,7 @@ describe('Waku Relay', () => {
   });
 
   it('Does not register any sub protocol', async function () {
-    const waku = await Waku.create();
+    const waku = await Waku.create(NOISE_KEY_1);
 
     const protocols = Array.from(waku.libp2p.upgrader.protocols.keys());
     expect(protocols.findIndex((value) => value.match(/sub/))).to.eq(-1);
@@ -65,7 +69,7 @@ describe('Waku Relay', () => {
 
     beforeEach(async function () {
       this.timeout(10_000);
-      waku = await Waku.create();
+      waku = await Waku.create(NOISE_KEY_1);
 
       const peerId = waku.libp2p.peerId.toB58String();
       const localMultiaddr = waku.libp2p.multiaddrs.find((addr) =>

src/test_utils/constants.ts

@@ -0,0 +1,2 @@
+export const NOISE_KEY_1 = Buffer.alloc(32, 1);
+export const NOISE_KEY_2 = Buffer.alloc(32, 1);