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gesture_service.spec.js
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gesture_service.spec.js
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import GestureService from 'src/services/gesture_service/gesture_service.js'
const mockTouchEvent = (x, y) => ({
touches: [
{
screenX: x,
screenY: y
}
]
})
describe('GestureService', () => {
describe('swipeGesture', () => {
it('calls the callback on a successful swipe', () => {
let swiped = false
const callback = () => { swiped = true }
const gesture = GestureService.swipeGesture(
GestureService.DIRECTION_RIGHT,
callback
)
GestureService.beginSwipe(mockTouchEvent(100, 100), gesture)
GestureService.updateSwipe(mockTouchEvent(200, 100), gesture)
expect(swiped).to.eql(true)
})
it('calls the callback only once per begin', () => {
let hits = 0
const callback = () => { hits += 1 }
const gesture = GestureService.swipeGesture(
GestureService.DIRECTION_RIGHT,
callback
)
GestureService.beginSwipe(mockTouchEvent(100, 100), gesture)
GestureService.updateSwipe(mockTouchEvent(150, 100), gesture)
GestureService.updateSwipe(mockTouchEvent(200, 100), gesture)
expect(hits).to.eql(1)
})
it('doesn\'t call the callback on an opposite swipe', () => {
let swiped = false
const callback = () => { swiped = true }
const gesture = GestureService.swipeGesture(
GestureService.DIRECTION_RIGHT,
callback
)
GestureService.beginSwipe(mockTouchEvent(100, 100), gesture)
GestureService.updateSwipe(mockTouchEvent(0, 100), gesture)
expect(swiped).to.eql(false)
})
it('doesn\'t call the callback on a swipe below threshold', () => {
let swiped = false
const callback = () => { swiped = true }
const gesture = GestureService.swipeGesture(
GestureService.DIRECTION_RIGHT,
callback,
100
)
GestureService.beginSwipe(mockTouchEvent(100, 100), gesture)
GestureService.updateSwipe(mockTouchEvent(150, 100), gesture)
expect(swiped).to.eql(false)
})
it('doesn\'t call the callback on a perpendicular swipe', () => {
let swiped = false
const callback = () => { swiped = true }
const gesture = GestureService.swipeGesture(
GestureService.DIRECTION_RIGHT,
callback,
30,
0.5
)
GestureService.beginSwipe(mockTouchEvent(100, 100), gesture)
GestureService.updateSwipe(mockTouchEvent(150, 200), gesture)
expect(swiped).to.eql(false)
})
it('calls the callback on perpendicular swipe if within tolerance', () => {
let swiped = false
const callback = () => { swiped = true }
const gesture = GestureService.swipeGesture(
GestureService.DIRECTION_RIGHT,
callback,
30,
2.0
)
GestureService.beginSwipe(mockTouchEvent(100, 100), gesture)
GestureService.updateSwipe(mockTouchEvent(150, 150), gesture)
expect(swiped).to.eql(true)
})
it('works with any arbitrary 2d directions', () => {
let swiped = false
const callback = () => { swiped = true }
const gesture = GestureService.swipeGesture(
[-1, -1],
callback,
30,
0.1
)
GestureService.beginSwipe(mockTouchEvent(100, 100), gesture)
GestureService.updateSwipe(mockTouchEvent(60, 60), gesture)
expect(swiped).to.eql(true)
})
})
})

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