Block Editor: Refactor `LinkControl` tests to `@testing-library`

[tyxla]

What?

This PR refactors the <LinkControl /> tests to use @testing-library instead of react-dom and its testing utils.

Why?

We've been aiming to have all our component tests resemble user behavior as much as possible, so this is a step in that direction.

How?

This is a complex PR with many different types of changes, namely:

• Using @testing-library/react's render() instead of react-dom's render.
• Using @testing-library/user-event instead of react-dom/test-utils Simulate.
• Using @testing-library/react's act() instead of the react-dom/test-utils one.
• Removing act() where it is redundant.
• Using screen queries instead of querySelector and querySelectorAll()
• Improving some assertions - like toBeTruthy() -> toBeVisible().
• Reducing the DOM traversing - less .innerHTML, and more jest-dom assertions instead.

There's a bug with the keyDown events - they simply don't work with @testing-library/user-event, as for some reason the events dispatched there have a keyCode: 0. That's why we're falling back to fireEvent, where we can actually provide the keyCode ourselves and get around that problem.

There are a few more TODOs (and unadressed items from the ones listed above) in the file we're touching, but some of them will likely need changes to the components themselves, and this PR has grown a bit more than I expected, so I'm happy to follow-up with addressing those in another PRs.

Testing Instructions

Verify tests pass: npm run test:unit packages/block-editor/src/components/link-control/test/index.js

[github-actions[bot]]

Size Change: 0 B

Total Size: 1.24 MB

ℹ️ View Unchanged

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_{compressed-size-action}

[swissspidy]

There's a bug with the keyDown events - they simply don't work with @testing-library/user-event, as for some reason the events dispatched there have a keyCode: 0. That's why we're falling back to fireEvent, where we can actually provide the keyCode ourselves and get around that problem.

In case anyone wonders:

It's because @testing-library/user-event removed support for keyCode in version 14.

See also #45777

[tyxla]

Indeed @swissspidy, we did uncover that later and refactored a few of the components from using keyCode to code, or key, however, it turned out that this broke stuff in some locales. See #45607 for an example.