Testing visual components in vaadin

CourseProgramListViewTest.java

import com.vaadin.flow.component.button.Button;
import com.vaadin.flow.component.grid.Grid;
import com.vaadin.testbench.unit.SpringUIUnit4Test;
import cu.uclv.postgrade.Application;
import cu.uclv.postgrade.ui.view.course.program.CourseProgramListView;
import org.junit.Test;
import org.junit.jupiter.api.Assertions;
import org.slf4j.LoggerFactory;
import org.springframework.boot.test.context.SpringBootTest;

@SpringBootTest(classes =  {Application.class})
public class CourseProgramListViewTest extends SpringUIUnit4Test {

    @Test
    public void test() {
        final CourseProgramListView courseProgramListView = navigate(CourseProgramListView.class);
        Grid grid = $view(Grid.class).first();
        Assertions.assertNotNull(grid.getLazyDataView().getItems());
        LoggerFactory.getLogger("Test").info("hay " + grid.getLazyDataView().getItemCountEstimate());
    }

    @Test
    public void test2() {
        final CourseProgramListView courseProgramListView = navigate(CourseProgramListView.class);
        Button button = $view(Button.class).withPropertyValue(Button::getText, "Crear")
                .single();
        Assertions.assertNotNull(button);
    }

    @Override
    public boolean printTree() {
        return true;
    }

}