fix test

Author: Artur-

packages/select/test/item-label-generator.test.js

@@ -25,7 +25,7 @@ describe('item-label-generator', () => {
       await oneEvent(select._overlayElement, 'vaadin-overlay-open');
       await nextRender();
 
-      const listBox = select._overlayElement.querySelector('vaadin-select-list-box');
+      const listBox = select._menuElement;
       expect(listBox).to.be.ok;
       const items = listBox.querySelectorAll('vaadin-select-item');
       expect(items).to.have.lengthOf(3);
@@ -42,7 +42,7 @@ describe('item-label-generator', () => {
       await oneEvent(select._overlayElement, 'vaadin-overlay-open');
       await nextRender();
 
-      const listBox = select._overlayElement.querySelector('vaadin-select-list-box');
+      const listBox = select._menuElement;
       expect(listBox).to.be.ok;
       const items = listBox.querySelectorAll('vaadin-select-item');
       expect(items).to.have.lengthOf(3);
@@ -59,7 +59,7 @@ describe('item-label-generator', () => {
       await oneEvent(select._overlayElement, 'vaadin-overlay-open');
       await nextRender();
 
-      const listBox = select._overlayElement.querySelector('vaadin-select-list-box');
+      const listBox = select._menuElement;
       expect(listBox).to.be.ok;
       let items = listBox.querySelectorAll('vaadin-select-item');
       expect(items[0].textContent).to.equal('1');
@@ -79,7 +79,7 @@ describe('item-label-generator', () => {
       await oneEvent(select._overlayElement, 'vaadin-overlay-open');
       await nextRender();
 
-      const listBox = select._overlayElement.querySelector('vaadin-select-list-box');
+      const listBox = select._menuElement;
       expect(listBox).to.be.ok;
       const items = listBox.querySelectorAll('vaadin-select-item');
       expect(items[0].textContent).to.equal('');
@@ -93,7 +93,7 @@ describe('item-label-generator', () => {
       await oneEvent(select._overlayElement, 'vaadin-overlay-open');
       await nextRender();
 
-      const listBox = select._overlayElement.querySelector('vaadin-select-list-box');
+      const listBox = select._menuElement;
       expect(listBox).to.be.ok;
       const items = listBox.querySelectorAll('vaadin-select-item');
       expect(items[0].textContent).to.equal('');
@@ -114,7 +114,7 @@ describe('item-label-generator', () => {
       await oneEvent(select._overlayElement, 'vaadin-overlay-open');
       await nextRender();
 
-      const listBox = select._overlayElement.querySelector('vaadin-select-list-box');
+      const listBox = select._menuElement;
       expect(listBox).to.be.ok;
       const items = listBox.querySelectorAll('vaadin-select-item');
       expect(items[0].textContent).to.equal('John (30)');