Support testing with SpringBootTest

[mstahv]

In my apps running on Spring Boot and tested with Playwright, I have used the pattern to launch cases using Spring Boot's testing conventions/utilities. Pretty much like described here:

https://vaadin.com/docs/latest/flow/testing/playwright#first-playwright-test

I wanted to use TestBench with similar setup (for its convenience), but that ended up being quite difficult and finally gave up. We should ensure it is possible (somehow I remember I have done that in the past, but I might be mistaken, anyways, LLMs have now ruined my perseverance) and document how it is done. Probably in our Spring Boot examples this should also be the default approach.

[mcollovati]

Can you provide additional information about what is not working correctly?

[mstahv]

Got a tip from another colleague whose example looked exactly like mine, tested with a fresh "hello world project" and there this seems to work. Need to reduce with the bigger project what was the issue I had. Docs and default should anyways go to this direction 🤷‍♂️

@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)
public class TaskListViewIT extends BrowserTestBase {

    @LocalServerPort
    private int port;

    @BrowserTest
    void viewOpensAndGridIsRendered() {
        getDriver().get("http://localhost:" + port + "/");

        GridElement grid = $(GridElement.class).waitForFirst();

        assertTrue(grid.isDisplayed(), "Grid should be visible on the page");
    }
}