May 2019
Intermediate to advanced
496 pages
10h 38m
English
Content preview from Mastering React Test-Driven Development
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Alerting when the animation is complete
The Git tag for this section is is-animating.
We'll do this by introducing a new state variable in the Drawing component, named isAnimating, and toggle it to true if we're currently animating, and false otherwise:
- In test/Drawing.test.js, add a new nested describe block within the main Display context, just below the context for resetting. Then, add the following test:
describe('isAnimating', () => { describe('draw line animation', () => { it('adds isAnimating class to viewport when animation begins', () => { renderWithStore(<Drawing />, { script: { drawCommands: [horizontalLine] } }); triggerRequestAnimationFrame(0); expect( container.querySelector('#viewport').className ).toContain('isAnimating'); ...Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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