feat: support dial only on transport manager to tolerate errors (#643)

* feat: support dial only on transport manager to tolerate errors

* chore: address review

* chore: add jsdoc to transport manager tolerance errors

test/transports/transport-manager.spec.js

@@ -15,6 +15,8 @@ const mockUpgrader = require('../utils/mockUpgrader')
 const { MULTIADDRS_WEBSOCKETS } = require('../fixtures/browser')
 const { codes: ErrorCodes } = require('../../src/errors')
 const Libp2p = require('../../src')
+const { FaultTolerance } = require('../../src/transport-manager')
+
 const Peers = require('../fixtures/peers')
 const PeerId = require('peer-id')
 
@@ -165,3 +167,55 @@ describe('libp2p.transportManager', () => {
     expect(libp2p.transportManager.close.callCount).to.equal(1)
   })
 })
+
+describe('libp2p.transportManager (dial only)', () => {
+  let peerId
+  let libp2p
+
+  before(async () => {
+    peerId = await PeerId.createFromJSON(Peers[0])
+  })
+
+  afterEach(async () => {
+    sinon.restore()
+    libp2p && await libp2p.stop()
+  })
+
+  it('fails to start if multiaddr fails to listen', async () => {
+    libp2p = new Libp2p({
+      peerId,
+      addresses: {
+        listen: [multiaddr('/ip4/127.0.0.1/tcp/0')]
+      },
+      modules: {
+        transport: [Transport]
+      }
+    })
+
+    try {
+      await libp2p.start()
+    } catch (err) {
+      expect(err).to.exist()
+      expect(err.code).to.equal(ErrorCodes.ERR_NO_VALID_ADDRESSES)
+      return
+    }
+    throw new Error('it should fail to start if multiaddr fails to listen')
+  })
+
+  it('does not fail to start if multiaddr fails to listen when supporting dial only mode', async () => {
+    libp2p = new Libp2p({
+      peerId,
+      addresses: {
+        listen: [multiaddr('/ip4/127.0.0.1/tcp/0')]
+      },
+      transportManager: {
+        faultTolerance: FaultTolerance.NO_FATAL
+      },
+      modules: {
+        transport: [Transport]
+      }
+    })
+
+    await libp2p.start()
+  })
+})