Add basic BetaProgram feature.

services/web/test/UnitTests/coffee/BetaProgram/BetaProgramHandlerTests.coffee

@@ -0,0 +1,65 @@
+should = require('chai').should()
+SandboxedModule = require('sandboxed-module')
+assert = require('assert')
+path = require('path')
+modulePath = path.join __dirname, '../../../../app/js/Features/BetaProgram/BetaProgramHandler'
+sinon = require("sinon")
+expect = require("chai").expect
+
+
+describe 'BetaProgramHandler', ->
+
+	beforeEach ->
+		@user_id = "some_id"
+		@user =
+			_id: @user_id
+			email: 'user@example.com'
+			features: {}
+			betaProgram: false
+			save: sinon.stub().callsArgWith(0, null)
+		@handler = SandboxedModule.require modulePath, requires:
+			"../../models/User": {
+				User:
+					findById: sinon.stub().callsArgWith(1, null, @user)
+			},
+			"logger-sharelatex": @logger = {
+				log: sinon.stub()
+				err: sinon.stub()
+			},
+			"../../infrastructure/Metrics": @logger = {
+				inc: sinon.stub()
+			}
+
+
+	describe "optIn", ->
+
+		beforeEach ->
+			@call = (callback) =>
+				@handler.optIn @user_id, callback
+
+		it "should set betaProgram = true on user object", (done) ->
+			@call (err) =>
+				@user.betaProgram.should.equal true
+				done()
+
+		it "should call user.save", (done) ->
+			@call (err) =>
+				@user.save.callCount.should.equal 1
+				done()
+
+		it "should not produce an error", (done) ->
+			@call (err) =>
+				expect(err).to.equal null
+				expect(err).to.not.be.instanceof Error
+				done()
+
+		describe "when user.save produces an error", ->
+
+			beforeEach ->
+				@user.save.callsArgWith(0, new Error('woops'))
+
+			it "should produce an error", (done) ->
+				@call (err) =>
+					expect(err).to.not.equal null
+					expect(err).to.be.instanceof Error
+					done()