Cleanup

test/insertAfter.test.js

@@ -5,7 +5,7 @@ test('insertAfter is a Function', () => {
   expect(insertAfter).toBeInstanceOf(Function);
 });
 let e = document.createElement('div');
-e.setAttribute("id", "test");
+e.setAttribute('id', 'test');
 test('Does not throw error if the element exists', () => {
   expect(() => {
     insertAfter(e, '<span>test</span>');