fix: mock templates folder in test env ( we need to mimic templates structure as we have it in dist folder )

Author: Zakhar Dolozhevskiy

src/index.spec.ts

@@ -2,13 +2,15 @@ import * as fse from 'fs-extra';
 import * as path from 'path';
 import * as OpenAPI from './index';
 
-describe('index', () => {
-    beforeAll(() =>
-        fse.symlinkSync(path.resolve(__dirname, 'templates'), path.resolve(__dirname, 'utils/templates'), 'dir')
-    );
+beforeAll(() => {
+    fse.symlinkSync(path.resolve(__dirname, 'templates'), path.resolve(__dirname, 'utils/templates'), 'dir');
+});
 
-    afterAll(() => fse.unlinkSync(path.resolve(__dirname, 'utils/templates')));
+afterAll(() => {
+    fse.unlinkSync(path.resolve(__dirname, 'utils/templates'));
+});
 
+describe('index', () => {
     it('parses v2 without issues', async () => {
         await OpenAPI.generate({
             input: './test/spec/v2.json',