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49 lines
1.1 KiB
49 lines
1.1 KiB
2 years ago
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import { describe, expect, it } from '@jest/globals'
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import DefaultStore from './index.js'
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describe('DefaultStore', () => {
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it('can be created with or without new', () => {
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let store = DefaultStore()
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expect(typeof store).toBe('object')
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store = new DefaultStore()
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expect(typeof store).toBe('object')
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})
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it('merges in state using `setState`', () => {
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const store = DefaultStore()
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expect(store.getState()).toEqual({})
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store.setState({
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a: 1,
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b: 2,
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})
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expect(store.getState()).toEqual({ a: 1, b: 2 })
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store.setState({ b: 3 })
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expect(store.getState()).toEqual({ a: 1, b: 3 })
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})
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it('notifies subscriptions when state changes', () => {
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let expected = []
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let calls = 0
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function listener (prevState, nextState, patch) {
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calls++
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expect([prevState, nextState, patch]).toEqual(expected)
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}
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const store = DefaultStore()
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store.subscribe(listener)
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expected = [{}, { a: 1, b: 2 }, { a: 1, b: 2 }]
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store.setState({
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a: 1,
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b: 2,
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})
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expected = [{ a: 1, b: 2 }, { a: 1, b: 3 }, { b: 3 }]
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store.setState({ b: 3 })
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expect(calls).toBe(2)
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})
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})
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