We've been using Storybook for isolated development of state-heavy components and it's been a nice productivity booster, compared to testing inside the actual app.

As a bonus, the stories that get created live in your codebase and can be integrated into several different types of testing - jest test suites, visual regression testing, and puppeteer / Selenium.

There's certainly an overhead for mocking data properly, but I tend to see that as part of the general challenge of testing frontend / JS code.