add failing tests for desired evicition behavior

Author: feross

test/evict.js

@@ -0,0 +1,126 @@
+var Buffer = require('safe-buffer').Buffer
+var Client = require('../')
+var common = require('./common')
+var test = require('tape')
+var electronWebrtc = require('electron-webrtc')
+
+var wrtc
+
+var infoHash = '4cb67059ed6bd08362da625b3ae77f6f4a075705'
+var peerId = Buffer.from('01234567890123456789')
+var peerId2 = Buffer.from('12345678901234567890')
+var peerId3 = Buffer.from('23456789012345678901')
+
+function serverTest (t, serverType, serverFamily) {
+  t.plan(10)
+
+  var hostname = serverFamily === 'inet6'
+    ? '[::1]'
+    : '127.0.0.1'
+
+  var opts = {
+    serverType: serverType,
+    peersCacheLength: 2 // LRU cache can only contain a max of 2 peers
+  }
+
+  common.createServer(t, opts, function (server) {
+    // Not using announceUrl param from `common.createServer()` since we
+    // want to control IPv4 vs IPv6.
+    var port = server[serverType].address().port
+    var announceUrl = serverType + '://' + hostname + ':' + port + '/announce'
+
+    var client1 = new Client({
+      infoHash: infoHash,
+      announce: [ announceUrl ],
+      peerId: peerId,
+      port: 6881,
+      wrtc: wrtc
+    })
+    if (serverType === 'ws') common.mockWebsocketTracker(client1)
+
+    client1.start()
+
+    client1.once('update', function (data) {
+      var client2 = new Client({
+        infoHash: infoHash,
+        announce: [ announceUrl ],
+        peerId: peerId2,
+        port: 6882,
+        wrtc: wrtc
+      })
+      if (serverType === 'ws') common.mockWebsocketTracker(client2)
+
+      client2.start()
+
+      client2.once('update', function (data) {
+        server.getSwarm(infoHash, function (err, swarm) {
+          t.error(err)
+
+          t.equal(swarm.complete + swarm.incomplete, 2)
+
+          // Ensure that first peer is evicted when a third one is added
+          var evicted = false
+          swarm.peers.once('evict', function (evictedPeer) {
+            t.equal(evictedPeer.value.peerId, peerId.toString('hex'))
+            t.equal(swarm.complete + swarm.incomplete, 2)
+            evicted = true
+          })
+
+          var client3 = new Client({
+            infoHash: infoHash,
+            announce: [ announceUrl ],
+            peerId: peerId3,
+            port: 6880,
+            wrtc: wrtc
+          })
+          if (serverType === 'ws') common.mockWebsocketTracker(client3)
+
+          client3.start()
+
+          client3.once('update', function (data) {
+            t.ok(evicted, 'client1 was evicted from server before client3 gets response')
+            t.equal(swarm.complete + swarm.incomplete, 2)
+
+            client1.destroy(function () {
+              t.pass('client1 destroyed')
+            })
+
+            client2.destroy(function () {
+              t.pass('client3 destroyed')
+            })
+
+            client3.destroy(function () {
+              t.pass('client3 destroyed')
+            })
+
+            server.close(function () {
+              t.pass('server destroyed')
+            })
+          })
+        })
+      })
+    })
+  })
+}
+
+test('evict: ipv4 server', function (t) {
+  serverTest(t, 'http', 'inet')
+})
+
+test('evict: http ipv6 server', function (t) {
+  serverTest(t, 'http', 'inet6')
+})
+
+test('evict: udp server', function (t) {
+  serverTest(t, 'udp', 'inet')
+})
+
+test('evict: ws server', function (t) {
+  wrtc = electronWebrtc()
+  wrtc.electronDaemon.once('ready', function () {
+    serverTest(t, 'ws', 'inet')
+  })
+  t.once('end', function () {
+    wrtc.close()
+  })
+})