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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,67 @@ | ||
'use strict'; | ||
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const common = require('../common'); | ||
const { | ||
Readable, | ||
} = require('stream'); | ||
const { deepStrictEqual, rejects } = require('assert'); | ||
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const { from } = Readable; | ||
{ | ||
// Synchronous streams | ||
(async () => { | ||
deepStrictEqual(await from([1, 2, 3]).drop(2).toArray(), [3]); | ||
deepStrictEqual(await from([1, 2, 3]).take(1).toArray(), [1]); | ||
deepStrictEqual(await from([]).drop(2).toArray(), []); | ||
deepStrictEqual(await from([]).take(1).toArray(), []); | ||
deepStrictEqual(await from([1, 2, 3]).drop(1).take(1).toArray(), [2]); | ||
deepStrictEqual(await from([1, 2]).drop(0).toArray(), [1, 2]); | ||
deepStrictEqual(await from([1, 2]).take(0).toArray(), []); | ||
})().then(common.mustCall()); | ||
// Asynchronous streams | ||
(async () => { | ||
const fromAsync = (...args) => from(...args).map(async (x) => x); | ||
deepStrictEqual(await fromAsync([1, 2, 3]).drop(2).toArray(), [3]); | ||
deepStrictEqual(await fromAsync([1, 2, 3]).take(1).toArray(), [1]); | ||
deepStrictEqual(await fromAsync([]).drop(2).toArray(), []); | ||
deepStrictEqual(await fromAsync([]).take(1).toArray(), []); | ||
deepStrictEqual(await fromAsync([1, 2, 3]).drop(1).take(1).toArray(), [2]); | ||
deepStrictEqual(await fromAsync([1, 2]).drop(0).toArray(), [1, 2]); | ||
deepStrictEqual(await fromAsync([1, 2]).take(0).toArray(), []); | ||
})().then(common.mustCall()); | ||
// Infinite streams | ||
// Asynchronous streams | ||
(async () => { | ||
const naturals = () => from(async function*() { | ||
let i = 1; | ||
while (true) { | ||
yield i++; | ||
} | ||
}()); | ||
deepStrictEqual(await naturals().take(1).toArray(), [1]); | ||
deepStrictEqual(await naturals().drop(1).take(1).toArray(), [2]); | ||
const next10 = [11, 12, 13, 14, 15, 16, 17, 18, 19, 20]; | ||
deepStrictEqual(await naturals().drop(10).take(10).toArray(), next10); | ||
deepStrictEqual(await naturals().take(5).take(1).toArray(), [1]); | ||
})().then(common.mustCall()); | ||
} | ||
{ | ||
// Error cases | ||
// TODO(benjamingr) check if the spec coerces | ||
const invalidArgs = [ | ||
'5', | ||
undefined, | ||
null, | ||
{}, | ||
[], | ||
from([1, 2, 3]), | ||
Promise.resolve(5), | ||
]; | ||
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||
for (const example of invalidArgs) { | ||
rejects( | ||
from([]).take(example).toArray(), | ||
/ERR_INVALID_ARG_TYPE/ | ||
).then(common.mustCall()); | ||
} | ||
} |