Fix tests codestyle

Author: hudochenkov

test/test.js

@@ -228,14 +228,14 @@ test('Should insert empty lines between @media rules in accordance with option \
 
 test('Should not insert additional line between @media and children rules if they have empty lines inside group', t => {
 	return run(t, 'lines-between-rules-issue-19', {
-		"sort-order": [
-			["@mixin"],
-			["..."],
-			["@media"],
-			[">child"]
+		'sort-order': [
+			['@mixin'],
+			['...'],
+			['@media'],
+			['>child']
 		],
-		"empty-lines-between-children-rules": 1,
-		"empty-lines-between-media-rules": 1
+		'empty-lines-between-children-rules': 1,
+		'empty-lines-between-media-rules': 1
 	});
 });