Auto use jest-extended matchers in tests

jest.config.js

@@ -7,5 +7,8 @@ module.exports = {
 	clearMocks: true,
 	collectCoverage: true,
 	coverageDirectory: 'coverage',
-	coverageProvider: 'v8'
+	coverageProvider: 'v8',
+	setupFilesAfterEnv: [
+		'jest-extended/all'
+	]
 };

lib/__tests__/importJSON.test.js

@@ -1,11 +1,8 @@
 'use strict';
 
 const importJSON = require('../importJSON');
-const matchers = require('jest-extended');
 const fs = require('fs');
 
-expect.extend(matchers);
-
 describe('importJSON', () => {
 	test('Import a file from config dir if no dir param given', () => {
 		const loadedFile = importJSON('db.sample');