diff --git a/package.json b/package.json
index 480959e118..ba6d1d5edf 100644
--- a/package.json
+++ b/package.json
@@ -121,13 +121,14 @@
     "karma-ng-html2js-preprocessor": "~0.1.0",
     "karma-phantomjs-launcher": "~0.1.0",
     "karma-requirejs": "~0.2.0",
-    "requirejs": "~2.1",
     "karma-script-launcher": "~0.1.0",
     "lcov-result-merger": "^1.0.2",
+    "lodash.defaultsdeep": "^3.10.0",
     "mocha": "^2.3.3",
     "mongodb": "^2.0.46",
     "mongoskin": "~0.6.1",
     "protractor": "~2.0.0",
+    "requirejs": "~2.1",
     "rewire": "^2.3.3",
     "shelljs": "^0.4.0",
     "sinon": "^1.17.2",
diff --git a/tasks/gulp-tests.js b/tasks/gulp-tests.js
index 3f2f469f29..3979cbd52b 100644
--- a/tasks/gulp-tests.js
+++ b/tasks/gulp-tests.js
@@ -297,6 +297,7 @@ gulp.task('test:e2e:safe', ['test:prepare', 'test:prepare:server'], (cb) => {
 });
 
 gulp.task('test:api-v2', ['test:prepare:server'], (done) => {
+  process.env.API_VERSION = 'v2';
   awaitPort(TEST_SERVER_PORT).then(() => {
     runMochaTests('./test/api/v2/**/*.js', server, done)
   });
@@ -329,15 +330,16 @@ gulp.task('test:api-v3', ['test:api-v3:unit', 'test:api-v3:integration']);
 
 gulp.task('test:api-v3:watch', ['test:api-v3:unit:watch', 'test:api-v3:integration:watch']);
 
-gulp.task('test:api-v3:unit', ['test:prepare:server'], (done) => {
+gulp.task('test:api-v3:unit', (done) => {
   runMochaTests('./test/api/v3/unit/**/*.js', null, done)
 });
 
-gulp.task('test:api-v3:unit:watch', ['test:prepare:server'], () => {
+gulp.task('test:api-v3:unit:watch', () => {
   gulp.watch(['website/src/**', 'test/api/v3/unit/**'], ['test:api-v3:unit']);
 });
 
 gulp.task('test:api-v3:integration', ['test:prepare:server'], (done) => {
+  process.env.API_VERSION = 'v3';
   awaitPort(TEST_SERVER_PORT).then(() => {
     runMochaTests('./test/api/v3/unit/**/*.js', server, done)
   });
diff --git a/test/api/v3/unit/middlewares/errorHandler.test.js b/test/api/v3/unit/middlewares/errorHandler.test.js
index 39e72b2e45..7ce86127e5 100644
--- a/test/api/v3/unit/middlewares/errorHandler.test.js
+++ b/test/api/v3/unit/middlewares/errorHandler.test.js
@@ -1,33 +1,29 @@
+import {
+  generateRes,
+  generateReq,
+  generateNext,
+} from '../../../../helpers/api-unit.helper';
+
 import errorHandler from '../../../../../website/src/middlewares/api-v3/errorHandler';
 
 import { BadRequest } from '../../../../../website/src/libs/api-v3/errors';
 import logger from '../../../../../website/src/libs/api-v3/logger';
 
 describe('errorHandler', () => {
-  let res, req;
+  let res, req, next;
 
   beforeEach(() => {
-    res = {
-      status: sinon.stub().returnsThis(),
-      json: sinon.stub(),
-    };
-    req = {
-      originalUrl: 'foo',
-      headers: {},
-      body: {},
-    };
+    res = generateRes();
+    req = generateReq();
+    next = generateNext();
 
-    sinon.stub(logger, 'error');
-  });
-
-  afterEach(() => {
-    logger.error.restore();
+    sandbox.stub(logger, 'error');
   });
 
   it('sends internal server error if error is not a CustomError', () => {
     let error = new Error();
 
-    errorHandler(error, req, res);
+    errorHandler(error, req, res, next);
 
     expect(res.status).to.be.calledOnce;
     expect(res.json).to.be.calledOnce;
@@ -42,7 +38,7 @@ describe('errorHandler', () => {
   it('sends CustomError', () => {
     let error = new BadRequest();
 
-    errorHandler(error, req, res);
+    errorHandler(error, req, res, next);
 
     expect(res.status).to.be.calledOnce;
     expect(res.json).to.be.calledOnce;
@@ -57,7 +53,7 @@ describe('errorHandler', () => {
   it('logs error', () => {
     let error = new BadRequest();
 
-    errorHandler(error, req, res);
+    errorHandler(error, req, res, next);
 
     expect(logger.error).to.be.calledOnce;
     expect(logger.error).to.be.calledWith(error.stack, {
@@ -68,7 +64,6 @@ describe('errorHandler', () => {
   });
 
   it('does not send error if error is not defined', () => {
-    let next = sinon.stub();
     errorHandler(null, req, res, next);
 
     expect(next).to.be.calledOnce;
diff --git a/test/helpers/api-integration.helper.js b/test/helpers/api-integration.helper.js
index b2b0ac99c6..1ddaa75b0d 100644
--- a/test/helpers/api-integration.helper.js
+++ b/test/helpers/api-integration.helper.js
@@ -208,9 +208,10 @@ export function resetHabiticaDB() {
 }
 
 function _requestMaker(user, method, additionalSets) {
+  const API_V = process.env.API_VERSION || 'v2'
   return (route, send, query) => {
     return new Promise((resolve, reject) => {
-      let request = superagent[method](`http://localhost:${API_TEST_SERVER_PORT}/api/v2${route}`)
+      let request = superagent[method](`http://localhost:${API_TEST_SERVER_PORT}/api/${API_V}${route}`)
         .accept('application/json');
 
       if (user && user._id && user.apiToken) {
diff --git a/test/helpers/api-unit.helper.js b/test/helpers/api-unit.helper.js
new file mode 100644
index 0000000000..6e561df076
--- /dev/null
+++ b/test/helpers/api-unit.helper.js
@@ -0,0 +1,46 @@
+// @TODO: remove when lodash can be upgraded
+import defaults from 'lodash.defaultsdeep';
+import { model as User } from '../../website/src/models/user'
+import { model as Group } from '../../website/src/models/group'
+import i18n from '../../common/script/src/i18n';
+require('coffee-script');
+i18n.translations = require('../../website/src/libs/i18n.js').translations;
+
+afterEach(() => {
+  sandbox.restore();
+});
+
+export function generateUser(options={}) {
+  return new User(options).toObject();
+}
+
+export function generateGroup(options={}) {
+  return new Group(options).toObject();
+}
+
+export function generateRes(options={}) {
+  let defaultRes = {
+    send: sandbox.stub(),
+    status: sandbox.stub().returnsThis(),
+    json: sandbox.stub(),
+    locals: {
+      user: generateUser(options.localsUser),
+      group: generateGroup(options.localsGroup),
+    },
+  };
+
+  return defaults(options, defaultRes);
+}
+
+export function generateReq(options={}) {
+  let defaultReq = {
+    body: {},
+    query: {},
+  };
+
+  return defaults(options, defaultReq);
+}
+
+export function generateNext(func) {
+  return func || sandbox.stub();
+}
diff --git a/test/helpers/globals.helper.js b/test/helpers/globals.helper.js
index 74a9ae6045..32ec18f79e 100644
--- a/test/helpers/globals.helper.js
+++ b/test/helpers/globals.helper.js
@@ -8,3 +8,5 @@ global.sinon = require("sinon");
 chai.use(require("sinon-chai"))
 chai.use(require("chai-as-promised"));
 global.expect = chai.expect
+
+global.sandbox = sinon.sandbox.create();