Begin testing `UserSessionsManager`.

services/web/app/coffee/Features/User/UserSessionsManager.coffee

@@ -1,9 +1,10 @@
 Settings = require('settings-sharelatex')
 redis = require('redis-sharelatex')
-rclient = redis.createClient(Settings.redis.web)
 logger = require("logger-sharelatex")
 Async = require('async')
 
+rclient = redis.createClient(Settings.redis.web)
+
 module.exports = UserSessionsManager =
 
 	_sessionSetKey: (user) ->

services/web/test/UnitTests/coffee/User/UserSessionsManager.coffee

@@ -0,0 +1,47 @@
+sinon = require('sinon')
+chai = require('chai')
+should = chai.should()
+expect = chai.expect
+modulePath = "../../../../app/js/Features/User/UserSessionsManager.js"
+SandboxedModule = require('sandboxed-module')
+
+describe 'UserSessionsManager', ->
+
+	beforeEach ->
+		@user =
+			_id: "abcd"
+			email: "user@example.com"
+		@sessionId = 'some_session_id'
+		@rclient =
+			multi: () => @rclient
+			exec:     sinon.stub()
+			get:      sinon.stub().returns(@rclient)
+			sadd:     sinon.stub().returns(@rclient)
+			srem:     sinon.stub().returns(@rclient)
+			smembers: sinon.stub().returns(@rclient)
+			expire:   sinon.stub().returns(@rclient)
+		@redis =
+			createClient: () -> @rclient
+		@logger =
+			err:   sinon.stub()
+			error: sinon.stub()
+			log:   sinon.stub()
+		@settings =
+			redis:
+				web: {}
+		@UserSessionsManager = SandboxedModule.require modulePath, requires:
+			"redis-sharelatex":    @redis
+			"logger-sharelatex":   @logger
+			"settings-sharelatex": @settings
+
+	describe '_sessionSetKey', ->
+
+		it 'should build the correct key', ->
+			result = @UserSessionsManager._sessionSetKey(@user)
+			result.should.equal 'UserSessions:abcd'
+
+	describe '_sessionKey', ->
+
+		it 'should build the correct key', ->
+			result = @UserSessionsManager._sessionKey(@sessionId)
+			result.should.equal 'sess:some_session_id'