Converts tests for FormTokenField to use React.TestUtils #7777
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Description
This converts the tests for
components/form-token-field/test/index.js
fromenzyme
toReact.TestUtils
. This is because enzyme does not support React 16.3+ (and movement to do so is really slow). This will fix issues with breakage due to the enzyme incompatibility as components receive React 16.3+ features (such as forwardRef usage in #7557)Since this test is simulating events on rendered elements into a DOM, this required the use of React.TestUtils over react-test-renderer.
The neat thing here is this also shaved close to a second off of the execution time for this test (Note: very rudimentary comparison of the average between 3 runs without these changes and 3 runs after these changes)
Checklist: