@johngw/stream/test/sinks/toArray.test.ts

Reactive programming tools using the WHATWG Streams API.

import { fromCollection } from '@johngw/stream/sources/fromCollection'
import { toArray } from '@johngw/stream/sinks/toArray'

test('consumes a stream in to an array of values', async () => {
  expect(await toArray(fromCollection([0, 1, 2, 3, 4, 5, 6, 7, 8, 9]))).toEqual(
    [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
  )
})

test('errors in the stream will reject', async () => {
  await expect(
    toArray(
      fromCollection(
        (function* () {
          yield 1
          yield 2
          throw new Error('foo')
        })()
      )
    )
  ).rejects.toThrow('foo')
})

describe('the catch options', () => {
  test('return an object with results', async () => {
    expect(
      await toArray(fromCollection([0, 1, 2, 3, 4, 5, 6, 7, 8, 9]), {
        catch: true,
      })
    ).toEqual({ result: [0, 1, 2, 3, 4, 5, 6, 7, 8, 9] })
  })

  test('will return the error and any results before the error', async () => {
    expect(
      await toArray(
        fromCollection(
          (function* () {
            yield 1
            yield 2
            throw new Error('foo')
          })()
        ),
        { catch: true }
      )
    ).toMatchInlineSnapshot(`
    {
      "error": [Error: foo],
      "result": [
        1,
        2,
      ],
    }
  `)
  })
})