wip. checking test for nextjs-ts

Author: GoodDayForSurf

packages/devextreme-cli/testing/app-template.test.shared.js

@@ -45,6 +45,7 @@ module.exports = (env, { port } = { port: '8080' }) => {
                             try {
                                 await devServer.setLayout(layout);
                                 await devServer.setTheme(theme);
+                                await devServer.stop();
                                 await devServer.build();
                                 console.log('-----build----->');
                                 await devServer.start();

packages/devextreme-cli/testing/dev-server.js

@@ -30,6 +30,7 @@ module.exports = class DevServer {
     async stop() {
         if(this.env.engine.indexOf('nextjs') === 0) {
             if(startedPromise) {
+                console.log('----server.stop()------>');
                 await startedPromise.kill();
                 startedPromise = null;
             }