Function describeDefaultProp

packages/core/src/SpringValue.test.ts:312–406

()

}

function describeDefaultProp() {
  // The hook API always uses { default: true } for render-driven updates.
  // Some props can have default values (eg: onRest, config, etc), and
  // other props may behave differently when { default: true } is used.
  describe('when "default" prop is true', () => {
    describe('and "from" prop is changed', () => {
      describe('before the first animation', () => {
        it('updates the current value', () => {
          const props = { default: true, from: 1, to: 1 }
          const spring = new SpringValue(props)

          expect(spring.get()).toBe(1)
          expect(spring.idle).toBeTruthy()

          props.from = 0
          spring.start(props)

          expect(spring.get()).not.toBe(1)
          expect(spring.idle).toBeFalsy()
        })
      })

      describe('after the first animation', () => {
        it('does not start animating', async () => {
          const props = { default: true, from: 0, to: 2 }
          const spring = new SpringValue(props)
          await global.advanceUntilIdle()

          props.from = 1
          spring.start(props)

          expect(spring.get()).toBe(2)
          expect(spring.idle).toBeTruthy()
          expect(spring.animation.from).toBe(1)
        })

        describe('and "reset" prop is true', () => {
          it('starts at the "from" prop', async () => {
            const props: any = { default: true, from: 0, to: 2 }
            const spring = new SpringValue(props)
            await global.advanceUntilIdle()

            props.from = 1
            props.reset = true
            spring.start(props)

            expect(spring.animation.from).toBe(1)
            expect(spring.idle).toBeFalsy()
          })
        })
      })
    })
  })

  describe('when "default" prop is false', () => {
    describe('and "from" prop is defined', () => {
      it('updates the current value', () => {
        const spring = new SpringValue(0)