62 lines
1.5 KiB
JavaScript
62 lines
1.5 KiB
JavaScript
import { it, assert, assertEq } from 'folktest'
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import { dispatch } from '../../src/fantasy-land.js'
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const test = (re, str = '') => re instanceof RegExp ? re.test(str) : new RegExp(re).test(str)
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const assertErr = (f, err) => {
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try {
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f()
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} catch (e) {
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if (typeof err === 'string' || err instanceof RegExp) {
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assert(test(err, e.message), `${err} did not match ${e.message}`)
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} else if (typeof err === 'function') {
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assert(e.constructor === err)
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}
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return
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}
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const expected = err ? `"${err}" ` : ""
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assert(false, `expecting error ${expected}but function did not throw`)
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}
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const wrong = msg => assert(false, msg)
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export const Dispatch = [
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it('should dispatch to any listed method or fallback', () => {
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const a1 = {
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['fantasy-land/test']: x => assertEq(x, 1),
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test: () => wrong(`a1['test'] should not have been called`)
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}
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const f1 = dispatch(['fantasy-land/test', 'test'], (v, x) => {
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wrong(`f1 fallback should not have been called for ${JSON.stringify(x)}`)
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})
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f1(1, a1)
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delete a1['fantasy-land/test']
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assertErr(() => {
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f1(1, a1)
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})
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const f2 = dispatch(['test', 'fantasy-land/test'], (v, x) => {
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wrong(`f2 fallback should not have been called for ${JSON.stringify(x)}`)
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})
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const a2 = {
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['fantasy-land/test']: () => wrong(`a2['fantasy-land/test'] should not have been called`),
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test: x => assertEq(x, 2)
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}
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f2(2, a2)
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const f3 = dispatch(['fantasy-land/test', 'test'], x => {
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assertEq(x, 3)
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})
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f3(3, {})
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})
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]
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