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Mini Shell
Mini Shell
'use strict';
const common = require('../common');
const {
Readable,
} = require('stream');
const assert = require('assert');
const { once } = require('events');
{
// forEach works on synchronous streams with a synchronous predicate
const stream = Readable.from([1, 2, 3]);
const result = [1, 2, 3];
(async () => {
await stream.forEach((value) => assert.strictEqual(value, result.shift()));
})().then(common.mustCall());
}
{
// forEach works an asynchronous streams
const stream = Readable.from([1, 2, 3]).filter(async (x) => {
await Promise.resolve();
return true;
});
const result = [1, 2, 3];
(async () => {
await stream.forEach((value) => assert.strictEqual(value, result.shift()));
})().then(common.mustCall());
}
{
// forEach works on asynchronous streams with a asynchronous forEach fn
const stream = Readable.from([1, 2, 3]).filter(async (x) => {
await Promise.resolve();
return true;
});
const result = [1, 2, 3];
(async () => {
await stream.forEach(async (value) => {
await Promise.resolve();
assert.strictEqual(value, result.shift());
});
})().then(common.mustCall());
}
{
// forEach works on an infinite stream
const ac = new AbortController();
const { signal } = ac;
const stream = Readable.from(async function* () {
while (true) yield 1;
}(), { signal });
let i = 0;
assert.rejects(stream.forEach(common.mustCall((x) => {
i++;
if (i === 10) ac.abort();
assert.strictEqual(x, 1);
}, 10)), { name: 'AbortError' }).then(common.mustCall());
}
{
// Emitting an error during `forEach`
const stream = Readable.from([1, 2, 3, 4, 5]);
assert.rejects(stream.forEach(async (x) => {
if (x === 3) {
stream.emit('error', new Error('boom'));
}
}), /boom/).then(common.mustCall());
}
{
// Throwing an error during `forEach` (sync)
const stream = Readable.from([1, 2, 3, 4, 5]);
assert.rejects(stream.forEach((x) => {
if (x === 3) {
throw new Error('boom');
}
}), /boom/).then(common.mustCall());
}
{
// Throwing an error during `forEach` (async)
const stream = Readable.from([1, 2, 3, 4, 5]);
assert.rejects(stream.forEach(async (x) => {
if (x === 3) {
return Promise.reject(new Error('boom'));
}
}), /boom/).then(common.mustCall());
}
{
// Concurrency + AbortSignal
const ac = new AbortController();
let calls = 0;
const forEachPromise =
Readable.from([1, 2, 3, 4]).forEach(async (_, { signal }) => {
calls++;
await once(signal, 'abort');
}, { signal: ac.signal, concurrency: 2, highWaterMark: 0 });
// pump
assert.rejects(async () => {
await forEachPromise;
}, {
name: 'AbortError',
}).then(common.mustCall());
setImmediate(() => {
ac.abort();
assert.strictEqual(calls, 2);
});
}
{
// Error cases
assert.rejects(async () => {
await Readable.from([1]).forEach(1);
}, /ERR_INVALID_ARG_TYPE/).then(common.mustCall());
assert.rejects(async () => {
await Readable.from([1]).forEach((x) => x, {
concurrency: 'Foo'
});
}, /ERR_OUT_OF_RANGE/).then(common.mustCall());
assert.rejects(async () => {
await Readable.from([1]).forEach((x) => x, 1);
}, /ERR_INVALID_ARG_TYPE/).then(common.mustCall());
}
{
// Test result is a Promise
const stream = Readable.from([1, 2, 3, 4, 5]).forEach((_) => true);
assert.strictEqual(typeof stream.then, 'function');
}
{
const stream = Readable.from([1, 2, 3, 4, 5]);
Object.defineProperty(stream, 'map', {
value: common.mustNotCall(),
});
// Check that map isn't getting called.
stream.forEach(() => true);
}
Zerion Mini Shell 1.0