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Co-authored-by: Arya Emami <[email protected]>
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import reduceReducers from "@internal/reduceReducers"; | ||
import { reduceReducers } from 'redux' | ||
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describe('Utils', () => { | ||
describe('reduceReducers', () => { | ||
const incrementReducer = (state = 0, action: { type: "increment" }) => | ||
const incrementReducer = (state = 0, action: { type: 'increment' }) => | ||
action.type === 'increment' ? state + 1 : state | ||
const decrementReducer = (state = 0, action: { type: "decrement" }) => | ||
const decrementReducer = (state = 0, action: { type: 'decrement' }) => | ||
action.type === 'decrement' ? state - 1 : state | ||
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it("runs multiple reducers in sequence and returns the result of the last one", () => { | ||
it('runs multiple reducers in sequence and returns the result of the last one', () => { | ||
const combined = reduceReducers(incrementReducer, decrementReducer) | ||
expect(combined(0, { type: 'increment' })).toBe(1) | ||
expect(combined(1, { type: 'decrement' })).toBe(0) | ||
}) | ||
it("accepts an initial state argument", () => { | ||
it('accepts an initial state argument', () => { | ||
const combined = reduceReducers(2, incrementReducer, decrementReducer) | ||
expect(combined(undefined, { type: "increment" })).toBe(3) | ||
expect(combined(undefined, { type: 'increment' })).toBe(3) | ||
}) | ||
it("can accept the preloaded state of the first reducer", () => { | ||
it('can accept the preloaded state of the first reducer', () => { | ||
const parserReducer = (state: number | string = 0) => | ||
typeof state === 'string' ? parseInt(state, 10) : state | ||
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const combined = reduceReducers(parserReducer, incrementReducer) | ||
expect(combined("1", { type: "increment"})).toBe(2) | ||
expect(combined('1', { type: 'increment' })).toBe(2) | ||
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const combined2 = reduceReducers("1", parserReducer, incrementReducer) | ||
expect(combined2(undefined, { type: "increment"})).toBe(2) | ||
const combined2 = reduceReducers('1', parserReducer, incrementReducer) | ||
expect(combined2(undefined, { type: 'increment' })).toBe(2) | ||
}) | ||
it("accepts undefined as initial state", () => { | ||
it('accepts undefined as initial state', () => { | ||
const combined = reduceReducers(undefined, incrementReducer) | ||
expect(combined(undefined, { type: "increment" })).toBe(1) | ||
expect(combined(undefined, { type: 'increment' })).toBe(1) | ||
}) | ||
}); | ||
}) | ||
}) | ||
}) |