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import { AnimationConfig, mergeConfig } from './AnimationConfig'
const expo = (t: number) => Math.pow(t, 2)
describe('mergeConfig', () => {
it('can merge partial configs', () => {
let config = new AnimationConfig()
mergeConfig(config, { tension: 0 })
mergeConfig(config, { friction: 0 })
expect(config).toMatchObject({
tension: 0,
friction: 0,
})
config = new AnimationConfig()
mergeConfig(config, { frequency: 2 })
mergeConfig(config, { damping: 0 })
expect(config).toMatchObject({
frequency: 2,
damping: 0,
})
config = new AnimationConfig()
mergeConfig(config, { duration: 2000 })
mergeConfig(config, { easing: expo })
expect(config).toMatchObject({
duration: 2000,
easing: expo,
})
})
it('resets the "duration" when props are incompatible', () => {
const config = new AnimationConfig()
mergeConfig(config, { duration: 1000 })
expect(config.duration).toBeDefined()
mergeConfig(config, { decay: 0.998 })
expect(config.duration).toBeUndefined()
expect(config.decay).toBe(0.998)
mergeConfig(config, { duration: 1000 })
expect(config.duration).toBeDefined()
mergeConfig(config, { frequency: 0.5 })
expect(config.duration).toBeUndefined()
expect(config.frequency).toBe(0.5)
})
it('resets the "decay" when props are incompatible', () => {
const config = new AnimationConfig()
mergeConfig(config, { decay: 0.998 })
expect(config.decay).toBeDefined()
mergeConfig(config, { mass: 2 })
expect(config.decay).toBeUndefined()
expect(config.mass).toBe(2)
})
it('resets the "frequency" when props are incompatible', () => {
const config = new AnimationConfig()
mergeConfig(config, { frequency: 0.5 })
expect(config.frequency).toBeDefined()
mergeConfig(config, { tension: 0 })
expect(config.frequency).toBeUndefined()
expect(config.tension).toBe(0)
})
describe('frequency/damping props', () => {
it('properly converts to tension/friction', () => {
const config = new AnimationConfig()
const merged = mergeConfig(config, { frequency: 0.5, damping: 1 })
expect(merged.tension).toBe(157.91367041742973)
expect(merged.friction).toBe(25.132741228718345)
})
it('works with extreme but valid values', () => {
const config = new AnimationConfig()
const merged = mergeConfig(config, { frequency: 2.6, damping: 0.1 })
expect(merged.tension).toBe(5.840002604194885)
expect(merged.friction).toBe(0.483321946706122)
})
it('prevents a damping ratio less than 0', () => {
const config = new AnimationConfig()
const validConfig = mergeConfig(config, { frequency: 0.5, damping: 0 })
const invalidConfig = mergeConfig(config, { frequency: 0.5, damping: -1 })
expect(invalidConfig).toMatchObject(validConfig)
})
it('prevents a frequency response less than 0.01', () => {
const config = new AnimationConfig()
const validConfig = mergeConfig(config, { frequency: 0.01, damping: 1 })
const invalidConfig = mergeConfig(config, { frequency: 0, damping: 1 })
expect(invalidConfig).toMatchObject(validConfig)
})
})
})
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