Function describeFromProp

packages/core/src/SpringValue.test.ts:253–274

()

}

function describeFromProp() {
  describe('when "from" prop is defined', () => {
    it('controls the start value', async () => {
      const spring = new SpringValue<number>()
      const onChange = vi.fn()
      spring.start({
        from: 5,
        to: 10,
        config: { duration: 10 * frameLength },
        onChange,
      })
      expect(spring.get()).toBe(5)
      await global.advance()
      // After the first frame the spring should have moved away from "from"
      // toward "to" — it should never have read its prior current value.
      // `onChange` receives an AnimationResult, so read `result.value`. See #2183.
      expect(onChange.mock.calls[0][0].value).toBeGreaterThan(5)
      await global.advanceUntilIdle()
      expect(spring.get()).toBe(10)
    })
  })
}

function describeResetProp() {
  describe('when "reset" prop is true', () => {