Update to use Jest

Author: jsilvax

.gitignore

@@ -5,4 +5,5 @@ test/fixtures/**/dir
 .coveralls.yml
 *.log
 /dist
-.vscode
+.vscode/
+.yarn-error.log

test/css-entry-array.test.js renamed to __tests__/css-entry-array.test.js

@@ -6,7 +6,7 @@ const dirPath = path.join(__dirname, './fixtures/css-array-entry/dir');
 const fileShouldNotExist = require('./utils/file-should-not-exist.js');
 
 describe('Array of CSS Dependencies as Entry', () => {
-	before(done => {
+	beforeEach(done => {
 		rimraf(dirPath, () => {
 			done();
 		});
@@ -20,7 +20,7 @@ describe('Array of CSS Dependencies as Entry', () => {
 	});
 
 	it('JS entry source map should not exist', done => {
-		var optionSourceMap = Object.assign({}, options);
+		const optionSourceMap = Object.assign({}, options);
 		optionSourceMap.devtool = 'source-map';
 
 		webpack(optionSourceMap, () => {