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'use strict'
const test = require('tape')
const buildQueue = require('../').promise
const { promisify } = require('util')
const sleep = promisify(setTimeout)
const immediate = promisify(setImmediate)
test('concurrency', function (t) {
t.plan(2)
t.throws(buildQueue.bind(null, worker, 0))
t.doesNotThrow(buildQueue.bind(null, worker, 1))
async function worker (arg) {
return true
}
})
test('worker execution', async function (t) {
const queue = buildQueue(worker, 1)
const result = await queue.push(42)
t.equal(result, true, 'result matches')
async function worker (arg) {
t.equal(arg, 42)
return true
}
})
test('limit', async function (t) {
const queue = buildQueue(worker, 1)
const [res1, res2] = await Promise.all([queue.push(10), queue.push(0)])
t.equal(res1, 10, 'the result matches')
t.equal(res2, 0, 'the result matches')
async function worker (arg) {
await sleep(arg)
return arg
}
})
test('multiple executions', async function (t) {
const queue = buildQueue(worker, 1)
const toExec = [1, 2, 3, 4, 5]
const expected = ['a', 'b', 'c', 'd', 'e']
let count = 0
await Promise.all(toExec.map(async function (task, i) {
const result = await queue.push(task)
t.equal(result, expected[i], 'the result matches')
}))
async function worker (arg) {
t.equal(arg, toExec[count], 'arg matches')
return expected[count++]
}
})
test('drained', async function (t) {
const queue = buildQueue(worker, 2)
const toExec = new Array(10).fill(10)
let count = 0
async function worker (arg) {
await sleep(arg)
count++
}
toExec.forEach(function (i) {
queue.push(i)
})
await queue.drained()
t.equal(count, toExec.length)
toExec.forEach(function (i) {
queue.push(i)
})
await queue.drained()
t.equal(count, toExec.length * 2)
})
test('drained with exception should not throw', async function (t) {
const queue = buildQueue(worker, 2)
const toExec = new Array(10).fill(10)
async function worker () {
throw new Error('foo')
}
toExec.forEach(function (i) {
queue.push(i)
})
await queue.drained()
})
test('drained with drain function', async function (t) {
let drainCalled = false
const queue = buildQueue(worker, 2)
queue.drain = function () {
drainCalled = true
}
const toExec = new Array(10).fill(10)
let count = 0
async function worker (arg) {
await sleep(arg)
count++
}
toExec.forEach(function () {
queue.push()
})
await queue.drained()
t.equal(count, toExec.length)
t.equal(drainCalled, true)
})
test('set this', async function (t) {
t.plan(1)
const that = {}
const queue = buildQueue(that, worker, 1)
await queue.push(42)
async function worker (arg) {
t.equal(this, that, 'this matches')
}
})
test('unshift', async function (t) {
const queue = buildQueue(worker, 1)
const expected = [1, 2, 3, 4]
await Promise.all([
queue.push(1),
queue.push(4),
queue.unshift(3),
queue.unshift(2)
])
t.is(expected.length, 0)
async function worker (arg) {
t.equal(expected.shift(), arg, 'tasks come in order')
}
})
test('push with worker throwing error', async function (t) {
t.plan(5)
const q = buildQueue(async function (task, cb) {
throw new Error('test error')
}, 1)
q.error(function (err, task) {
t.ok(err instanceof Error, 'global error handler should catch the error')
t.match(err.message, /test error/, 'error message should be "test error"')
t.equal(task, 42, 'The task executed should be passed')
})
try {
await q.push(42)
} catch (err) {
t.ok(err instanceof Error, 'push callback should catch the error')
t.match(err.message, /test error/, 'error message should be "test error"')
}
})
test('unshift with worker throwing error', async function (t) {
t.plan(2)
const q = buildQueue(async function (task, cb) {
throw new Error('test error')
}, 1)
try {
await q.unshift(42)
} catch (err) {
t.ok(err instanceof Error, 'push callback should catch the error')
t.match(err.message, /test error/, 'error message should be "test error"')
}
})
test('no unhandledRejection (push)', async function (t) {
function handleRejection () {
t.fail('unhandledRejection')
}
process.once('unhandledRejection', handleRejection)
const q = buildQueue(async function (task, cb) {
throw new Error('test error')
}, 1)
q.push(42)
await immediate()
process.removeListener('unhandledRejection', handleRejection)
})
test('no unhandledRejection (unshift)', async function (t) {
function handleRejection () {
t.fail('unhandledRejection')
}
process.once('unhandledRejection', handleRejection)
const q = buildQueue(async function (task, cb) {
throw new Error('test error')
}, 1)
q.unshift(42)
await immediate()
process.removeListener('unhandledRejection', handleRejection)
})
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