June 2019
Intermediate to advanced
192 pages
4h
English
Content preview from Test-Driven React
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Testing Styled Components
Let’s check how our tests are doing, starting with Carousel:
| | $ npx jest src/tests/Carousel.test.js |
| | FAIL src/tests/Carousel.test.js |
| | Carousel |
| | ✓ renders a <div> (5ms) |
| | ✓ has an initial `slideIndex` of 0 (1ms) |
| | ✓ renders a CarouselButton labeled "Prev" (1ms) |
| | ✓ renders a CarouselButton labeled "Next" |
| | ✕ renders the current slide as a CarouselSlide (12ms) |
| | with a middle slide selected |
| | ✓ decrements `slideIndex` when Prev is clicked (4ms) |
| | ✓ increments `slideIndex` when Next is clicked (1ms) |
| | with the first slide selected |
| | ✓ wraps `slideIndex` to the max value when Prev is clicked |
| | with the last slide selected |
| | ✓ wraps `slideIndex` to the min value when Next is clicked (1ms) |
| | |
| | ● Carousel › ... |
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