vaadin-framework/uitest/src/main/java/com/vaadin/tests/components/combobox/ComboBoxInPopup.java

package com.vaadin.tests.components.combobox;

import com.vaadin.event.ShortcutAction.KeyCode;
import com.vaadin.tests.components.TestBase;
import com.vaadin.ui.Button;
import com.vaadin.ui.ComboBox;
import com.vaadin.ui.Component;
import com.vaadin.ui.VerticalLayout;
import com.vaadin.ui.Window;

public class ComboBoxInPopup extends TestBase {

    @Override
    protected void setup() {
        VerticalLayout layout = new VerticalLayout();
        layout.setMargin(true);
        layout.setSizeUndefined();
        final Window w = new Window();
        w.setContent(layout);
        layout.addComponent(createComboBox());
        Button close = new Button("Close window", event -> w.close());
        close.setClickShortcut(KeyCode.ESCAPE, null);
        layout.addComponent(close);

        getLayout().getUI().addWindow(w);

    }

    private Component createComboBox() {
        ComboBox<String> comboBox = new ComboBox<String>("A combo box");
        comboBox.setItems("Yes", "No", "Maybe");
        return comboBox;
    }

    @Override
    protected String getDescription() {
        return "Escape is a shortcut for the close button. Pressing escape when the popup is open should cause only the popup to close, not the window.";
    }

    @Override
    protected Integer getTicketNumber() {
        return 6978;
    }

}