chore(package): update ava to version 3.1.0

package.json

@@ -4,9 +4,6 @@
   "version": "0.0.0-development",
   "author": "Pierre Vanduynslager (https://github.com/pvdlg)",
   "ava": {
-    "helpers": [
-      "test/helpers/**/*"
-    ],
     "files": [
       "test/*.test.js"
     ]
@@ -17,7 +14,7 @@
   "devDependencies": {
     "@babel/core": "^7.0.0",
     "@babel/preset-env": "^7.0.0",
-    "ava": "^2.4.0",
+    "ava": "^3.1.0",
     "codecov": "^3.0.0",
     "conventional-changelog-metahub": "^4.0.0",
     "eslint-plugin-sort-class-members": "^1.2.0",

test/helpers/karma.js

@@ -1,6 +1,6 @@
-import pEvent from 'p-event';
-import {Server, constants} from 'karma';
-import karmaJasmineJQuery from '../..';
+const pEvent = require('p-event');
+const {Server, constants} = require('karma');
+const karmaJasmineJQuery = require('../..');
 
 /**
  * Base Karma configuration tu run plugin.
@@ -47,7 +47,7 @@ const KARMA_CONFIG = {
  * @param {string|Array<string>}  frameworks Karma frameworks to include in the run.
  * @return {Promise<KarmaOutput>} A `Promise` that resolve to the Karma execution results.
  */
-export default async function run(fixtures, frameworks) {
+async function run(fixtures, frameworks) {
 	const server = new Server(
 		Object.assign(KARMA_CONFIG, {
 			files: Array.isArray(fixtures) ? fixtures : [fixtures],
@@ -73,3 +73,5 @@ export default async function run(fixtures, frameworks) {
 		return {success, failed, error: err, disconnected, exitCode: 1};
 	}
 }
+
+module.exports = run;

test/plugin.test.js

@@ -1,5 +1,5 @@
-import test from 'ava';
-import run from './helpers/karma';
+const test = require('ava');
+const run = require('./helpers/karma');
 
 test('Jasmine-JQuery should be loaded', async t => {
 	const fixture = 'test/fixtures/jasmine-jquery.test.js';