From 0514b0034bbe9472cf7bb06845437899dcdc7c9f Mon Sep 17 00:00:00 2001
From: Pau Ramon Revilla <masylum@gmail.com>
Date: Fri, 25 Sep 2015 09:26:50 +0200
Subject: [PATCH] Do not allow undefined `peerInfo`

# What

The code assumes that `peerInfo` exists, the API doesn't.

# How to test

```js
swarm = new Swarm()
swarm.addTransport('tcp', tcp, { multiaddr: mh }, {}, {port: 8095})
```

This shouldn't explode because of `self.peerInfo.multiaddrs`.
---
 src/index.js        |  1 -
 src/swarm.js        |  4 ++++
 tests/swarm-test.js | 10 ++++++++++
 3 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/src/index.js b/src/index.js
index b825469a..5e3bb399 100644
--- a/src/index.js
+++ b/src/index.js
@@ -1,4 +1,3 @@
 var Swarm = require('./swarm')
 
 exports = module.exports = Swarm
-exports.singleton = new Swarm()
diff --git a/src/swarm.js b/src/swarm.js
index 2fa4f5d4..5f56208c 100644
--- a/src/swarm.js
+++ b/src/swarm.js
@@ -11,6 +11,10 @@ function Swarm (peerInfo) {
     throw new Error('Swarm must be called with new')
   }
 
+  if (!peerInfo) {
+    throw new Error('You must provide a value for `peerInfo`')
+  }
+
   self.peerInfo = peerInfo
 
   // peerIdB58: { conn: <conn> }
diff --git a/tests/swarm-test.js b/tests/swarm-test.js
index bf5baeaa..e9bd63cf 100644
--- a/tests/swarm-test.js
+++ b/tests/swarm-test.js
@@ -24,6 +24,16 @@ process.on('uncaughtException', function (err) {
   console.log('Caught exception: ' + err)
 })
 
+experiment('Without a peer', function () {
+  test('it throws an exception', function (done) {
+    expect(function () {
+      var sw = new Swarm()
+      sw.close()
+    }).to.throw(Error)
+    done()
+  })
+})
+
 experiment('Without a Stream Muxer', function () {
   experiment('tcp', function () {
     test('add the transport', function (done) {