[7.x] [SIEM] Uses faster wait from testing-library and removes duplicate older wait idiom (#72509) #72549
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…der wait idiom (elastic#72509) ## Summary * Removes the older wait pattern that does a block no matter what * Utilizes the improved and better pattern for test-library's waitFor which will test immediately and then poll for results * Changes everything to put their expect statement within the waitFor * Once the waitFor is in TypeScript/JS we can change the import statement to use that If you get a timeout or error this is what it looks like now which improves the developer experience in some ways but does degrade things in others as it suggests that everything is timeout related. However, developers should inspect the values and remove the waitFor() and re-run their tests if they think that they have a real problem during development. <img width="990" alt="Screen Shot 2020-07-20 at 12 40 39 PM" src="https://user-images.githubusercontent.com/1151048/87975739-4084d980-ca89-11ea-83c9-ba3fb932a175.png"> See the API for more information: https://testing-library.com/docs/dom-testing-library/api-async#waitfor But in short we should be using: ```ts await waitFor(() => expect(...)); ``` throughout our code at this point and the waitFor will loop quickly and efficiently until it either times out or gets the condition expected. ### Checklist Delete any items that are not applicable to this PR. - [x] [Unit or functional tests](https://github.com/elastic/kibana/blob/master/CONTRIBUTING.md#cross-browser-compatibility) were updated or added to match the most common scenarios
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Backports the following commits to 7.x: