fix: wait for peer stats to be updated during test (#1238)

The peer stats update interval doesn't always align with the timing
in the test so make sure it's elapsed before asserting on the results.

Fixes #1219

test/metrics/index.node.ts

@@ -11,6 +11,7 @@ import { createBaseOptions } from '../utils/base-options.js'
 import type { Libp2pNode } from '../../src/libp2p.js'
 import type { Libp2pOptions } from '../../src/index.js'
 import type { DefaultMetrics } from '../../src/metrics/index.js'
+import pWaitFor from 'p-wait-for'
 import drain from 'it-drain'
 
 describe('libp2p.metrics', () => {
@@ -170,6 +171,19 @@ describe('libp2p.metrics', () => {
       throw new Error('Metrics not configured')
     }
 
+    await pWaitFor(() => {
+      const peerStats = metrics.forPeer(connection.remotePeer)?.getSnapshot()
+      const transferred = parseInt(peerStats?.dataReceived.toString() ?? '0')
+
+      if (transferred < bytes.length) {
+        return false
+      }
+
+      return true
+    }, {
+      interval: 100
+    })
+
     const peerStats = metrics.forPeer(connection.remotePeer)?.getSnapshot()
     expect(parseInt(peerStats?.dataReceived.toString() ?? '0')).to.be.at.least(bytes.length)