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import {bundleAsync} from '../../../src/lib/async/bundle'
describe('bundle', () => {
it('bundles multiple simultaneous calls into one execution', async () => {
let calls = 0
const fn = bundleAsync(async () => {
calls++
await new Promise(r => setTimeout(r, 1))
return 'hello'
})
const [res1, res2, res3] = await Promise.all([fn(), fn(), fn()])
expect(calls).toEqual(1)
expect(res1).toEqual('hello')
expect(res2).toEqual('hello')
expect(res3).toEqual('hello')
})
it('does not bundle non-simultaneous calls', async () => {
let calls = 0
const fn = bundleAsync(async () => {
calls++
await new Promise(r => setTimeout(r, 1))
return 'hello'
})
const res1 = await fn()
const res2 = await fn()
const res3 = await fn()
expect(calls).toEqual(3)
expect(res1).toEqual('hello')
expect(res2).toEqual('hello')
expect(res3).toEqual('hello')
})
it('is not affected by rejections', async () => {
let calls = 0
const fn = bundleAsync(async () => {
calls++
await new Promise(r => setTimeout(r, 1))
throw new Error()
})
const res1 = await fn().catch(() => 'reject')
const res2 = await fn().catch(() => 'reject')
const res3 = await fn().catch(() => 'reject')
expect(calls).toEqual(3)
expect(res1).toEqual('reject')
expect(res2).toEqual('reject')
expect(res3).toEqual('reject')
})
})
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