add notification backend and unit test

add notification init frontend

services/web/test/UnitTests/coffee/Notifications/NotificationsControllerTests.coffee

@@ -0,0 +1,39 @@
+SandboxedModule = require('sandboxed-module')
+assert = require('assert')
+require('chai').should()
+sinon = require('sinon')
+modulePath = require('path').join __dirname, '../../../../app/js/Features/Notifications/NotificationsController.js'
+
+
+describe 'NotificationsController', ->
+	user_id = "123nd3ijdks"
+	notification_id = "123njdskj9jlk"
+
+	beforeEach ->
+		@handler = 
+			getUserNotifications: sinon.stub().callsArgWith(1)
+			markAsRead: sinon.stub().callsArgWith(2)
+		@controller = SandboxedModule.require modulePath, requires:
+			"./NotificationsHandler":@handler
+			'logger-sharelatex':
+				log:->
+				err:->
+		@req =
+			params:
+				notification_id:notification_id
+			session:
+				user:
+					_id:user_id
+
+	it 'should ask the handler for all unread notifications', (done)->
+		allNotifications = [{_id: notification_id, user_id: user_id}]
+		@handler.getUserNotifications = sinon.stub().callsArgWith(1, null, allNotifications)
+		@controller.getAllUnreadNotifications @req, send:(body)=>
+			body.should.equal allNotifications
+			@handler.getUserNotifications.calledWith(user_id).should.equal true
+			done()
+
+	it 'should send a delete request when a delete has been received to mark a notification', (done)->
+		@controller.markNotificationAsRead @req, send:=>
+			@handler.markAsRead.calledWith(user_id, notification_id).should.equal true
+			done()

services/web/test/UnitTests/coffee/Notifications/NotificationsHandlerTests.coffee

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+SandboxedModule = require('sandboxed-module')
+assert = require('chai').assert
+require('chai').should()
+sinon = require('sinon')
+modulePath = require('path').join __dirname, '../../../../app/js/Features/Notifications/NotificationsHandler.js'
+_ = require('underscore')
+
+
+describe 'NotificationsHandler', ->
+	user_id = "123nd3ijdks"
+	notification_id = "123njdskj9jlk"
+	notificationUrl = "notification.sharelatex.testing"
+
+	beforeEach ->
+		@request = 
+			post: sinon.stub().callsArgWith(1)
+			del: sinon.stub().callsArgWith(1)
+			get: sinon.stub()
+		@handler = SandboxedModule.require modulePath, requires:
+			"settings-sharelatex": apis:{notifications:{url:notificationUrl}}
+			"request":@request
+			'logger-sharelatex':
+				log:->
+				err:->
+
+	describe "getUserNotifications", ->
+		it 'should get unread notifications', (done)->
+			stubbedNotifications = [{_id: notification_id, user_id: user_id}]
+			@request.get.callsArgWith(1, null, {statusCode:200}, stubbedNotifications)
+			@handler.getUserNotifications user_id, (err, unreadNotifications)=>
+				stubbedNotifications.should.deep.equal unreadNotifications
+				getOpts =
+					uri: "#{notificationUrl}/user/#{user_id}"
+					json:true
+					timeout:2000
+				@request.get.calledWith(getOpts).should.equal true
+				done()
+
+		it 'should return empty arrays if there are no notifications', ->
+			@request.get.callsArgWith(1, null, {statusCode:200}, null)
+			@handler.getUserNotifications user_id, (err, unreadNotifications)=>
+				unreadNotifications.length.should.equal 0
+
+	describe "markAsRead", ->
+		it 'should send a delete request when a delete has been received to mark a notification', (done)->
+			@handler.markAsRead user_id, notification_id, =>
+				@request.del.calledWith({uri:"#{notificationUrl}/user/#{user_id}/notification/#{notification_id}", timeout:1000}).should.equal true
+				done()