chore: complete pubsub tests

CHANGELOG.md

@@ -1,3 +1,12 @@
+## [0.8.2](https://github.com/libp2p/js-interfaces/compare/v0.8.1...v0.8.2) (2021-01-20)
+
+
+### Bug Fixes
+
+* event emitter types with local types ([#80](https://github.com/libp2p/js-interfaces/issues/80)) ([ca52077](https://github.com/libp2p/js-interfaces/commit/ca520775eb26f5ed501375fdb24ba698c9a8c8c8))
+
+
+
 ## [0.8.1](https://github.com/libp2p/js-interfaces/compare/v0.8.0...v0.8.1) (2020-12-11)
 
 

README.md

@@ -4,6 +4,8 @@
 [![](https://img.shields.io/badge/project-libp2p-yellow.svg?style=flat-square)](http://libp2p.io/)
 [![](https://img.shields.io/badge/freenode-%23libp2p-yellow.svg?style=flat-square)](http://webchat.freenode.net/?channels=%23libp2p)
 [![](https://img.shields.io/discourse/https/discuss.libp2p.io/posts.svg)](https://discuss.libp2p.io)
+[![codecov](https://img.shields.io/codecov/c/github/libp2p/js-libp2p-interfaces.svg?style=flat-square)](https://codecov.io/gh/libp2p/js-libp2p-interfaces)
+[![GitHub Workflow Status](https://img.shields.io/github/workflow/status/libp2p/js-libp2p-interfaces/ci?label=ci&style=flat-square)](https://github.com/libp2p/js-libp2p-interfaces/actions?query=branch%3Amaster+workflow%3Aci+)
 
 > Contains test suites and interfaces you can use to implement the various components of libp2p.
 

package.json

@@ -1,6 +1,6 @@
 {
   "name": "libp2p-interfaces",
-  "version": "0.8.1",
+  "version": "0.8.2",
   "description": "Interfaces for JS Libp2p",
   "leadMaintainer": "Jacob Heun <jacobheun@gmail.com>",
   "main": "src/index.js",
@@ -24,6 +24,7 @@
   "scripts": {
     "lint": "aegir lint",
     "build": "aegir build",
+    "prepare": "aegir build --no-bundle",
     "test": "aegir test",
     "test:node": "aegir test --target node",
     "test:browser": "aegir test --target browser",

src/pubsub/index.js

@@ -1,7 +1,9 @@
 'use strict'
 
 const debug = require('debug')
-const { EventEmitter } = require('events')
+/** @typedef {import('../types').EventEmitterFactory} Events */
+/** @type Events */
+const EventEmitter = require('events')
 const errcode = require('err-code')
 
 const { pipe } = require('it-pipe')

src/pubsub/peer-streams.js

@@ -1,6 +1,8 @@
 'use strict'
 
-const { EventEmitter } = require('events')
+/** @typedef {import('../types').EventEmitterFactory} Events */
+/** @type Events */
+const EventEmitter = require('events')
 
 const lp = require('it-length-prefixed')
 

src/pubsub/tests/api.js

@@ -1,8 +1,7 @@
 /* eslint-env mocha */
 'use strict'
 
-const chai = require('chai')
+const { expect } = require('aegir/utils/chai')
-const { expect } = chai
 const sinon = require('sinon')
 
 const pDefer = require('p-defer')

src/pubsub/tests/connection-handlers.js

@@ -0,0 +1,305 @@
+/* eslint-env mocha */
+'use strict'
+
+const { expect } = require('aegir/utils/chai')
+const sinon = require('sinon')
+const pDefer = require('p-defer')
+const pWaitFor = require('p-wait-for')
+const uint8ArrayToString = require('uint8arrays/to-string')
+
+const { expectSet } = require('./utils')
+
+module.exports = (common) => {
+  describe('pubsub connection handlers', () => {
+    let psA, psB
+
+    describe('nodes send state on connection', () => {
+      // Create pubsub nodes and connect them
+      before(async () => {
+        [psA, psB] = await common.setup(2)
+
+        expect(psA.peers.size).to.be.eql(0)
+        expect(psB.peers.size).to.be.eql(0)
+
+        // Start pubsub
+        psA.start()
+        psB.start()
+      })
+
+      // Make subscriptions prior to nodes connected
+      before(() => {
+        psA.subscribe('Za')
+        psB.subscribe('Zb')
+
+        expect(psA.peers.size).to.equal(0)
+        expectSet(psA.subscriptions, ['Za'])
+        expect(psB.peers.size).to.equal(0)
+        expectSet(psB.subscriptions, ['Zb'])
+      })
+
+      after(async () => {
+        sinon.restore()
+        await common.teardown()
+      })
+
+      it('existing subscriptions are sent upon peer connection', async function () {
+        this.timeout(10e3)
+
+        await Promise.all([
+          psA._libp2p.dial(psB.peerId),
+          new Promise((resolve) => psA.once('pubsub:subscription-change', resolve)),
+          new Promise((resolve) => psB.once('pubsub:subscription-change', resolve))
+        ])
+
+        expect(psA.peers.size).to.equal(1)
+        expect(psB.peers.size).to.equal(1)
+
+        expectSet(psA.subscriptions, ['Za'])
+        expectSet(psB.topics.get('Za'), [psA.peerId.toB58String()])
+
+        expectSet(psB.subscriptions, ['Zb'])
+        expectSet(psA.topics.get('Zb'), [psB.peerId.toB58String()])
+      })
+    })
+
+    describe('pubsub started before connect', () => {
+      // Create pubsub nodes and start them
+      beforeEach(async () => {
+        [psA, psB] = await common.setup(2)
+
+        psA.start()
+        psB.start()
+      })
+
+      afterEach(async () => {
+        sinon.restore()
+
+        await common.teardown()
+      })
+
+      it('should get notified of connected peers on dial', async () => {
+        const connection = await psA._libp2p.dial(psB.peerId)
+        expect(connection).to.exist()
+
+        return Promise.all([
+          pWaitFor(() => psA.peers.size === 1),
+          pWaitFor(() => psB.peers.size === 1)
+        ])
+      })
+
+      it('should receive pubsub messages', async () => {
+        const defer = pDefer()
+        const topic = 'test-topic'
+        const data = 'hey!'
+
+        await psA._libp2p.dial(psB.peerId)
+
+        let subscribedTopics = psA.getTopics()
+        expect(subscribedTopics).to.not.include(topic)
+
+        psA.on(topic, (msg) => {
+          expect(uint8ArrayToString(msg.data)).to.equal(data)
+          defer.resolve()
+        })
+        psA.subscribe(topic)
+
+        subscribedTopics = psA.getTopics()
+        expect(subscribedTopics).to.include(topic)
+
+        // wait for psB to know about psA subscription
+        await pWaitFor(() => {
+          const subscribedPeers = psB.getSubscribers(topic)
+          return subscribedPeers.includes(psA.peerId.toB58String())
+        })
+        psB.publish(topic, data)
+
+        await defer.promise
+      })
+    })
+
+    describe('pubsub started after connect', () => {
+      // Create pubsub nodes
+      beforeEach(async () => {
+        [psA, psB] = await common.setup(2)
+      })
+
+      afterEach(async () => {
+        sinon.restore()
+
+        psA && psA.stop()
+        psB && psB.stop()
+
+        await common.teardown()
+      })
+
+      it('should get notified of connected peers after starting', async () => {
+        const connection = await psA._libp2p.dial(psB.peerId)
+        expect(connection).to.exist()
+        expect(psA.peers.size).to.be.eql(0)
+        expect(psB.peers.size).to.be.eql(0)
+
+        psA.start()
+        psB.start()
+
+        return Promise.all([
+          pWaitFor(() => psA.peers.size === 1),
+          pWaitFor(() => psB.peers.size === 1)
+        ])
+      })
+
+      it('should receive pubsub messages', async () => {
+        const defer = pDefer()
+        const topic = 'test-topic'
+        const data = 'hey!'
+
+        await psA._libp2p.dial(psB.peerId)
+
+        psA.start()
+        psB.start()
+
+        await Promise.all([
+          pWaitFor(() => psA.peers.size === 1),
+          pWaitFor(() => psB.peers.size === 1)
+        ])
+
+        let subscribedTopics = psA.getTopics()
+        expect(subscribedTopics).to.not.include(topic)
+
+        psA.on(topic, (msg) => {
+          expect(uint8ArrayToString(msg.data)).to.equal(data)
+          defer.resolve()
+        })
+        psA.subscribe(topic)
+
+        subscribedTopics = psA.getTopics()
+        expect(subscribedTopics).to.include(topic)
+
+        // wait for psB to know about psA subscription
+        await pWaitFor(() => {
+          const subscribedPeers = psB.getSubscribers(topic)
+          return subscribedPeers.includes(psA.peerId.toB58String())
+        })
+        psB.publish(topic, data)
+
+        await defer.promise
+      })
+    })
+
+    describe('pubsub with intermittent connections', () => {
+      // Create pubsub nodes and start them
+      beforeEach(async () => {
+        [psA, psB] = await common.setup(2)
+
+        psA.start()
+        psB.start()
+      })
+
+      afterEach(async () => {
+        sinon.restore()
+
+        psA && psA.stop()
+        psB && psB.stop()
+
+        await common.teardown()
+      })
+
+      it('should receive pubsub messages after a node restart', async function () {
+        this.timeout(10e3)
+        const topic = 'test-topic'
+        const data = 'hey!'
+        const psAid = psA.peerId.toB58String()
+
+        let counter = 0
+        const defer1 = pDefer()
+        const defer2 = pDefer()
+
+        await psA._libp2p.dial(psB.peerId)
+
+        let subscribedTopics = psA.getTopics()
+        expect(subscribedTopics).to.not.include(topic)
+
+        psA.on(topic, (msg) => {
+          expect(uint8ArrayToString(msg.data)).to.equal(data)
+          counter++
+          counter === 1 ? defer1.resolve() : defer2.resolve()
+        })
+        psA.subscribe(topic)
+
+        subscribedTopics = psA.getTopics()
+        expect(subscribedTopics).to.include(topic)
+
+        // wait for psB to know about psA subscription
+        await pWaitFor(() => {
+          const subscribedPeers = psB.getSubscribers(topic)
+          return subscribedPeers.includes(psAid)
+        })
+        psB.publish(topic, data)
+
+        await defer1.promise
+
+        psB.stop()
+        await psB._libp2p.stop()
+        await pWaitFor(() => !psA._libp2p.connectionManager.get(psB.peerId) && !psB._libp2p.connectionManager.get(psA.peerId))
+        await psB._libp2p.start()
+        psB.start()
+
+        psA._libp2p.peerStore.addressBook.set(psB.peerId, psB._libp2p.multiaddrs)
+        await psA._libp2p.dial(psB.peerId)
+
+        // wait for remoteLibp2p to know about libp2p subscription
+        await pWaitFor(() => {
+          const subscribedPeers = psB.getSubscribers(topic)
+          return subscribedPeers.includes(psAid)
+        })
+
+        psB.publish(topic, data)
+
+        await defer2.promise
+      })
+
+      it('should handle quick reconnects with a delayed disconnect', async () => {
+        // Subscribe on both
+        const handlerSpy = sinon.spy()
+        const topic = 'reconnect-channel'
+
+        psA.on(topic, handlerSpy)
+        psB.on(topic, handlerSpy)
+        await Promise.all([
+          psA.subscribe(topic),
+          psB.subscribe(topic)
+        ])
+
+        // Create two connections to the remote peer
+        const originalConnection = await psA._libp2p.dialer.connectToPeer(psB.peerId)
+        // second connection
+        await psA._libp2p.dialer.connectToPeer(psB.peerId)
+        expect(psA._libp2p.connections.get(psB.peerId.toB58String())).to.have.length(2)
+
+        // Wait for subscriptions to occur
+        await pWaitFor(() => {
+          return psA.getSubscribers(topic).includes(psB.peerId.toB58String()) &&
+            psB.getSubscribers(topic).includes(psA.peerId.toB58String())
+        })
+
+        // Verify messages go both ways
+        psA.publish(topic, 'message1')
+        psB.publish(topic, 'message2')
+        await pWaitFor(() => handlerSpy.callCount >= 2)
+        expect(handlerSpy.args.map(([message]) => uint8ArrayToString(message.data))).to.include.members(['message1', 'message2'])
+
+        // Disconnect the first connection (this acts as a delayed reconnect)
+        const psAConnUpdateSpy = sinon.spy(psA._libp2p.connectionManager.connections, 'set')
+
+        await originalConnection.close()
+        await pWaitFor(() => psAConnUpdateSpy.callCount === 1)
+
+        // Verify messages go both ways after the disconnect
+        handlerSpy.resetHistory()
+        psA.publish(topic, 'message3')
+        psB.publish(topic, 'message4')
+        await pWaitFor(() => handlerSpy.callCount >= 2)
+        expect(handlerSpy.args.map(([message]) => uint8ArrayToString(message.data))).to.include.members(['message3', 'message4'])
+      })
+    })
+  })
+}

src/pubsub/tests/emit-self.js

@@ -1,8 +1,7 @@
 /* eslint-env mocha */
 'use strict'
 
-const chai = require('chai')
+const { expect } = require('aegir/utils/chai')
-const { expect } = chai
 const sinon = require('sinon')
 
 const uint8ArrayFromString = require('uint8arrays/from-string')

src/pubsub/tests/index.js

@@ -4,6 +4,7 @@
 const apiTest = require('./api')
 const emitSelfTest = require('./emit-self')
 const messagesTest = require('./messages')
+const connectionHandlersTest = require('./connection-handlers')
 const twoNodesTest = require('./two-nodes')
 const multipleNodesTest = require('./multiple-nodes')
 
@@ -12,6 +13,7 @@ module.exports = (common) => {
     apiTest(common)
     emitSelfTest(common)
     messagesTest(common)
+    connectionHandlersTest(common)
     twoNodesTest(common)
     multipleNodesTest(common)
   })

src/pubsub/tests/messages.js

@@ -1,8 +1,7 @@
 /* eslint-env mocha */
 'use strict'
 
-const chai = require('chai')
+const { expect } = require('aegir/utils/chai')
-const { expect } = chai
 const sinon = require('sinon')
 
 const PeerId = require('peer-id')

src/pubsub/tests/multiple-nodes.js

@@ -2,8 +2,7 @@
 /* eslint max-nested-callbacks: ["error", 6] */
 'use strict'
 
-const chai = require('chai')
+const { expect } = require('aegir/utils/chai')
-const { expect } = chai
 const sinon = require('sinon')
 
 const delay = require('delay')

src/pubsub/tests/two-nodes.js

@@ -2,8 +2,7 @@
 /* eslint max-nested-callbacks: ["error", 6] */
 'use strict'
 
-const chai = require('chai')
+const { expect } = require('aegir/utils/chai')
-const { expect } = chai
 const sinon = require('sinon')
 
 const pDefer = require('p-defer')
@@ -24,205 +23,148 @@ function shouldNotHappen (_) {
 
 module.exports = (common) => {
   describe('pubsub with two nodes', () => {
-    describe('fresh nodes', () => {
+    let psA, psB
-      let psA, psB
 
-      // Create pubsub nodes and connect them
+    // Create pubsub nodes and connect them
-      before(async () => {
+    before(async () => {
-        [psA, psB] = await common.setup(2)
+      [psA, psB] = await common.setup(2)
 
-        expect(psA.peers.size).to.be.eql(0)
+      expect(psA.peers.size).to.be.eql(0)
-        expect(psB.peers.size).to.be.eql(0)
+      expect(psB.peers.size).to.be.eql(0)
 
-        // Start pubsub and connect nodes
+      // Start pubsub and connect nodes
-        psA.start()
+      psA.start()
-        psB.start()
+      psB.start()
 
-        await psA._libp2p.dial(psB.peerId)
+      await psA._libp2p.dial(psB.peerId)
 
-        // Wait for peers to be ready in pubsub
+      // Wait for peers to be ready in pubsub
-        await pWaitFor(() => psA.peers.size === 1 && psB.peers.size === 1)
+      await pWaitFor(() => psA.peers.size === 1 && psB.peers.size === 1)
-      })
-
-      after(async () => {
-        sinon.restore()
-
-        psA && psA.stop()
-        psB && psB.stop()
-
-        await common.teardown()
-      })
-
-      it('Subscribe to a topic in nodeA', () => {
-        const defer = pDefer()
-
-        psB.once('pubsub:subscription-change', (changedPeerId, changedSubs) => {
-          expectSet(psA.subscriptions, [topic])
-          expect(psB.peers.size).to.equal(1)
-          expectSet(psB.topics.get(topic), [psA.peerId.toB58String()])
-          expect(changedPeerId.toB58String()).to.equal(first(psB.peers).id.toB58String())
-          expect(changedSubs).to.be.eql([{ topicID: topic, subscribe: true }])
-          defer.resolve()
-        })
-        psA.subscribe(topic)
-
-        return defer.promise
-      })
-
-      it('Publish to a topic in nodeA', () => {
-        const defer = pDefer()
-
-        psA.once(topic, (msg) => {
-          expect(uint8ArrayToString(msg.data)).to.equal('hey')
-          psB.removeListener(topic, shouldNotHappen)
-          defer.resolve()
-        })
-
-        psB.once(topic, shouldNotHappen)
-
-        psA.publish(topic, uint8ArrayFromString('hey'))
-
-        return defer.promise
-      })
-
-      it('Publish to a topic in nodeB', () => {
-        const defer = pDefer()
-
-        psA.once(topic, (msg) => {
-          psA.once(topic, shouldNotHappen)
-          expect(uint8ArrayToString(msg.data)).to.equal('banana')
-
-          setTimeout(() => {
-            psA.removeListener(topic, shouldNotHappen)
-            psB.removeListener(topic, shouldNotHappen)
-
-            defer.resolve()
-          }, 100)
-        })
-
-        psB.once(topic, shouldNotHappen)
-
-        psB.publish(topic, uint8ArrayFromString('banana'))
-
-        return defer.promise
-      })
-
-      it('Publish 10 msg to a topic in nodeB', () => {
-        const defer = pDefer()
-        let counter = 0
-
-        psB.once(topic, shouldNotHappen)
-        psA.on(topic, receivedMsg)
-
-        function receivedMsg (msg) {
-          expect(uint8ArrayToString(msg.data)).to.equal('banana')
-          expect(msg.from).to.be.eql(psB.peerId.toB58String())
-          expect(msg.seqno).to.be.a('Uint8Array')
-          expect(msg.topicIDs).to.be.eql([topic])
-
-          if (++counter === 10) {
-            psA.removeListener(topic, receivedMsg)
-            psB.removeListener(topic, shouldNotHappen)
-
-            defer.resolve()
-          }
-        }
-
-        Array.from({ length: 10 }, (_, i) => psB.publish(topic, uint8ArrayFromString('banana')))
-
-        return defer.promise
-      })
-
-      it('Unsubscribe from topic in nodeA', () => {
-        const defer = pDefer()
-
-        psA.unsubscribe(topic)
-        expect(psA.subscriptions.size).to.equal(0)
-
-        psB.once('pubsub:subscription-change', (changedPeerId, changedSubs) => {
-          expect(psB.peers.size).to.equal(1)
-          expectSet(psB.topics.get(topic), [])
-          expect(changedPeerId.toB58String()).to.equal(first(psB.peers).id.toB58String())
-          expect(changedSubs).to.be.eql([{ topicID: topic, subscribe: false }])
-
-          defer.resolve()
-        })
-
-        return defer.promise
-      })
-
-      it('Publish to a topic:Z in nodeA nodeB', () => {
-        const defer = pDefer()
-
-        psA.once('Z', shouldNotHappen)
-        psB.once('Z', shouldNotHappen)
-
-        setTimeout(() => {
-          psA.removeListener('Z', shouldNotHappen)
-          psB.removeListener('Z', shouldNotHappen)
-          defer.resolve()
-        }, 100)
-
-        psB.publish('Z', uint8ArrayFromString('banana'))
-        psA.publish('Z', uint8ArrayFromString('banana'))
-
-        return defer.promise
-      })
     })
 
-    describe('nodes send state on connection', () => {
+    after(async () => {
-      let psA, psB
+      sinon.restore()
 
-      // Create pubsub nodes and connect them
+      psA && psA.stop()
-      before(async () => {
+      psB && psB.stop()
-        [psA, psB] = await common.setup(2)
 
-        expect(psA.peers.size).to.be.eql(0)
+      await common.teardown()
-        expect(psB.peers.size).to.be.eql(0)
+    })
 
-        // Start pubsub and connect nodes
+    it('Subscribe to a topic in nodeA', () => {
-        psA.start()
+      const defer = pDefer()
-        psB.start()
-      })
 
-      // Make subscriptions prior to nodes connected
+      psB.once('pubsub:subscription-change', (changedPeerId, changedSubs) => {
-      before(() => {
+        expectSet(psA.subscriptions, [topic])
-        psA.subscribe('Za')
-        psB.subscribe('Zb')
-
-        expect(psA.peers.size).to.equal(0)
-        expectSet(psA.subscriptions, ['Za'])
-        expect(psB.peers.size).to.equal(0)
-        expectSet(psB.subscriptions, ['Zb'])
-      })
-
-      after(async () => {
-        sinon.restore()
-
-        psA && psA.stop()
-        psB && psB.stop()
-
-        await common.teardown()
-      })
-
-      it('existing subscriptions are sent upon peer connection', async function () {
-        this.timeout(10e3)
-
-        await Promise.all([
-          psA._libp2p.dial(psB.peerId),
-          new Promise((resolve) => psA.once('pubsub:subscription-change', resolve)),
-          new Promise((resolve) => psB.once('pubsub:subscription-change', resolve))
-        ])
-
-        expect(psA.peers.size).to.equal(1)
         expect(psB.peers.size).to.equal(1)
-
+        expectSet(psB.topics.get(topic), [psA.peerId.toB58String()])
-        expectSet(psA.subscriptions, ['Za'])
+        expect(changedPeerId.toB58String()).to.equal(first(psB.peers).id.toB58String())
-        expectSet(psB.topics.get('Za'), [psA.peerId.toB58String()])
+        expect(changedSubs).to.be.eql([{ topicID: topic, subscribe: true }])
-
+        defer.resolve()
-        expectSet(psB.subscriptions, ['Zb'])
-        expectSet(psA.topics.get('Zb'), [psB.peerId.toB58String()])
       })
+      psA.subscribe(topic)
+
+      return defer.promise
+    })
+
+    it('Publish to a topic in nodeA', () => {
+      const defer = pDefer()
+
+      psA.once(topic, (msg) => {
+        expect(uint8ArrayToString(msg.data)).to.equal('hey')
+        psB.removeListener(topic, shouldNotHappen)
+        defer.resolve()
+      })
+
+      psB.once(topic, shouldNotHappen)
+
+      psA.publish(topic, uint8ArrayFromString('hey'))
+
+      return defer.promise
+    })
+
+    it('Publish to a topic in nodeB', () => {
+      const defer = pDefer()
+
+      psA.once(topic, (msg) => {
+        psA.once(topic, shouldNotHappen)
+        expect(uint8ArrayToString(msg.data)).to.equal('banana')
+
+        setTimeout(() => {
+          psA.removeListener(topic, shouldNotHappen)
+          psB.removeListener(topic, shouldNotHappen)
+
+          defer.resolve()
+        }, 100)
+      })
+
+      psB.once(topic, shouldNotHappen)
+
+      psB.publish(topic, uint8ArrayFromString('banana'))
+
+      return defer.promise
+    })
+
+    it('Publish 10 msg to a topic in nodeB', () => {
+      const defer = pDefer()
+      let counter = 0
+
+      psB.once(topic, shouldNotHappen)
+      psA.on(topic, receivedMsg)
+
+      function receivedMsg (msg) {
+        expect(uint8ArrayToString(msg.data)).to.equal('banana')
+        expect(msg.from).to.be.eql(psB.peerId.toB58String())
+        expect(msg.seqno).to.be.a('Uint8Array')
+        expect(msg.topicIDs).to.be.eql([topic])
+
+        if (++counter === 10) {
+          psA.removeListener(topic, receivedMsg)
+          psB.removeListener(topic, shouldNotHappen)
+
+          defer.resolve()
+        }
+      }
+
+      Array.from({ length: 10 }, (_, i) => psB.publish(topic, uint8ArrayFromString('banana')))
+
+      return defer.promise
+    })
+
+    it('Unsubscribe from topic in nodeA', () => {
+      const defer = pDefer()
+
+      psA.unsubscribe(topic)
+      expect(psA.subscriptions.size).to.equal(0)
+
+      psB.once('pubsub:subscription-change', (changedPeerId, changedSubs) => {
+        expect(psB.peers.size).to.equal(1)
+        expectSet(psB.topics.get(topic), [])
+        expect(changedPeerId.toB58String()).to.equal(first(psB.peers).id.toB58String())
+        expect(changedSubs).to.be.eql([{ topicID: topic, subscribe: false }])
+
+        defer.resolve()
+      })
+
+      return defer.promise
+    })
+
+    it('Publish to a topic:Z in nodeA nodeB', () => {
+      const defer = pDefer()
+
+      psA.once('Z', shouldNotHappen)
+      psB.once('Z', shouldNotHappen)
+
+      setTimeout(() => {
+        psA.removeListener('Z', shouldNotHappen)
+        psB.removeListener('Z', shouldNotHappen)
+        defer.resolve()
+      }, 100)
+
+      psB.publish('Z', uint8ArrayFromString('banana'))
+      psA.publish('Z', uint8ArrayFromString('banana'))
+
+      return defer.promise
     })
   })
 }

src/pubsub/tests/utils.js

@@ -1,6 +1,6 @@
 'use strict'
 
-const { expect } = require('chai')
+const { expect } = require('aegir/utils/chai')
 
 exports.first = (map) => map.values().next().value
 

src/types.ts

@@ -0,0 +1,18 @@
+export interface EventEmitterFactory {
+  new(): EventEmitter;
+}
+
+export interface EventEmitter {
+  addListener(event: string | symbol, listener: (...args: any[]) => void);
+  on(event: string | symbol, listener: (...args: any[]) => void);
+  once(event: string | symbol, listener: (...args: any[]) => void);
+  removeListener(event: string | symbol, listener: (...args: any[]) => void);
+  off(event: string | symbol, listener: (...args: any[]) => void);
+  removeAllListeners(event?: string | symbol);
+  setMaxListeners(n: number);
+  getMaxListeners(): number;
+  listeners(event: string | symbol): Function[]; // eslint-disable-line @typescript-eslint/ban-types
+  rawListeners(event: string | symbol): Function[]; // eslint-disable-line @typescript-eslint/ban-types
+  emit(event: string | symbol, ...args: any[]): boolean;
+  listenerCount(event: string | symbol): number;
+}