WIP - feat: convergence (#94)

* feat: convergence

* structure examples

test/nodejs-bundle/discovery.js

@@ -0,0 +1,99 @@
+/* eslint-env mocha */
+'use strict'
+
+const chai = require('chai')
+chai.use(require('dirty-chai'))
+const expect = chai.expect
+const signalling = require('libp2p-webrtc-star/src/sig-server')
+const parallel = require('async/parallel')
+const utils = require('./utils')
+const createNode = utils.createNode
+const echo = utils.echo
+
+describe('discovery', () => {
+  let nodeA
+  let nodeB
+  let port = 24642
+  let ss
+
+  function setup (options) {
+    before((done) => {
+      port++
+      parallel([
+        (cb) => {
+          signalling.start({ port: port }, (err, server) => {
+            expect(err).to.not.exist()
+            ss = server
+            cb()
+          })
+        },
+        (cb) => createNode([
+          '/ip4/0.0.0.0/tcp/0',
+          `/libp2p-webrtc-star/ip4/127.0.0.1/tcp/${port}/ws`
+        ], options, (err, node) => {
+          expect(err).to.not.exist()
+          nodeA = node
+          node.handle('/echo/1.0.0', echo)
+          node.start(cb)
+        }),
+        (cb) => createNode([
+          '/ip4/0.0.0.0/tcp/0',
+          `/libp2p-webrtc-star/ip4/127.0.0.1/tcp/${port}/ws`
+        ], options, (err, node) => {
+          expect(err).to.not.exist()
+          nodeB = node
+          node.handle('/echo/1.0.0', echo)
+          node.start(cb)
+        })
+      ], done)
+    })
+
+    after((done) => {
+      parallel([
+        (cb) => nodeA.stop(cb),
+        (cb) => nodeB.stop(cb),
+        (cb) => ss.stop(done)
+      ], done)
+    })
+  }
+
+  describe('MulticastDNS', () => {
+    setup({ mdns: true })
+
+    it('find a peer', (done) => {
+      nodeA.once('peer:discovery', (peerInfo) => {
+        expect(nodeB.peerInfo.id.toB58String())
+          .to.eql(peerInfo.id.toB58String())
+        done()
+      })
+    })
+  })
+
+  // TODO needs a delay (this test is already long)
+  describe.skip('WebRTCStar', () => {
+    setup({ webRTCStar: true })
+
+    it('find a peer', (done) => {
+      nodeA.once('peer:discovery', (peerInfo) => {
+        expect(nodeB.peerInfo.id.toB58String())
+          .to.eql(peerInfo.id.toB58String())
+        done()
+      })
+    })
+  })
+
+  describe('MulticastDNS + WebRTCStar', () => {
+    setup({
+      webRTCStar: true,
+      mdns: true
+    })
+
+    it('find a peer', (done) => {
+      nodeA.once('peer:discovery', (peerInfo) => {
+        expect(nodeB.peerInfo.id.toB58String())
+          .to.eql(peerInfo.id.toB58String())
+        done()
+      })
+    })
+  })
+})