35 lines
876 B
TypeScript
35 lines
876 B
TypeScript
/*
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* @jest-environment jsdom
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*/
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import Atom, {val} from './Atom'
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import prism from './prisms/prism/prism'
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import Ticker from './Ticker'
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describe(`v2 atom`, () => {
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describe(`identity pointers`, () => {
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it(`should work`, () => {
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const data = {foo: 'hi', bar: 0}
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const a = new Atom(data)
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const dataP = a.pointer
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const bar = dataP.bar
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expect(val(bar)).toEqual(0)
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const d = prism(() => {
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return val(bar)
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})
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expect(d.getValue()).toEqual(0)
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const ticker = new Ticker()
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const changes: number[] = []
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d.onChange(ticker, (c) => {
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changes.push(c)
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})
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a.setState({...data, bar: 1})
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ticker.tick()
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expect(changes).toHaveLength(1)
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expect(changes[0]).toEqual(1)
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a.setState({...data, bar: 1})
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ticker.tick()
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expect(changes).toHaveLength(1)
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})
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})
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})
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