Use getBy, not queryBy, to fail on missing element

[sompylasar]

BREAKING CHANGE: The queries will now throw a useful message and fail
the test if the queried element is missing.

[sompylasar]

While working on a PR to add getCommandWaiter to dom-testing-library as waitForElements, I realized that the breaking change I made here is not compatible with the current implementation of getCommandWaiter which does not catch exceptions. Somehow this works with my setup of Cypress, both waits for DOM and rejects if not found. I'll work more on this, so stay tuned.

[kentcdodds]

Super! Thanks :)

[sompylasar]

@kentcdodds Wowow I should have told you explicitly not to merge it yet, sorry. Anyway, it's still experimental, so hopefully won't break anyone's setups. I'm working on adding the waiter to dom-testing-library with some tests to it.

[kentcdodds]

No worries. This hasn't been published to npm yet 😉 I want to wait until it's fully tested first.

[sompylasar]

For the record, waitForElement is being added here: testing-library/dom-testing-library#10

[kentcdodds]

🎉 This PR is included in version 1.0.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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