buffered.js
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/* jshint loopfunc: true */
/* global describe:true, beforeEach:true, it:true */
var chan = require('..')
var expect = require('expect.js')
describe('A unbuffered channel', function () {
it(
'should not call the added callback until the value is removed',
function (done) {
var ch = chan(0) // unbuffered
var cbCalled = false
ch('foo')(function () {
cbCalled = true
})
setImmediate(function () {
expect(cbCalled).to.not.be.ok()
ch(function (err, val) {
setImmediate(function () {
expect(cbCalled).to.be.ok()
done()
})
})
})
}
)
})
describe('A buffered channel', function () {
it(
'should pull values from the buffer when yielded',
function (done) {
var ch = chan(1)
var cbCalled = false
var testValue = 'foo'
ch(testValue)
ch(function (err, val) {
cbCalled = true
expect(val).to.be(testValue)
})
setImmediate(function () {
expect(cbCalled).to.be.ok()
done()
})
}
)
describe('with a non-full buffer', function () {
it(
'should call added callback as soon as it is given to the returned thunk',
function (done) {
var buffer = 3
var ch = chan(buffer)
var called = 0
var added = 0
while (++added <= buffer + 10) {
ch(added)(function (err) {
called++
})
}
setImmediate(function () {
expect(called).to.be(buffer)
done()
})
}
)
})
describe('with a full buffer', function () {
it(
'should not add another value untill a value has been removed',
function (done) {
var ch = chan(1)
var cbCalled = false
ch('foo')
ch('bar')(function () {
cbCalled = true
})
setImmediate(function () {
expect(cbCalled).to.not.be.ok()
ch(function (err, val) {
setImmediate(function () {
expect(cbCalled).to.be.ok()
done()
})
})
})
}
)
it(
'should call cb with an error when the channel is closed before adding',
function (done) {
var ch = chan(0)
var cbCalled = false
ch('foo')(function (err) {
cbCalled = true
expect(err).to.be.an(Error)
})
ch.close()
setImmediate(function () {
expect(cbCalled).to.be.ok()
done()
})
}
)
})
})