chore: add unit test

Signed-off-by: Sacha Froment <sfroment42@gmail.com>

Author: sfroment

test/is-pub-sub.spec.ts

@@ -0,0 +1,22 @@
+import { stop, isPubSub } from '@libp2p/interface'
+import { mockNetwork } from '@libp2p/interface-compliance-tests/mocks'
+import { expect } from 'aegir/chai'
+import { createComponents, type GossipSubAndComponents } from './utils/create-pubsub.js'
+
+describe('is-pub-sub', () => {
+  let node: GossipSubAndComponents
+
+  before(async () => {
+    mockNetwork.reset()
+    node = await createComponents({})
+  })
+
+  after(async () => {
+    await stop(node.pubsub, ...Object.entries(node.components))
+    mockNetwork.reset()
+  })
+
+  it('should be a pub-sub node', () => {
+    expect(isPubSub(node.pubsub)).to.be.true()
+  })
+})