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unshift.coffee
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unshift.coffee
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should = require 'should'
each = if process.env.EACH_COV then require '../lib-cov/each' else require '../lib/each'
describe 'Unshift', ->
it 'accept array elements', (next) ->
each()
.unshift('hello')
.unshift('each')
.on 'item', (item, index, next) ->
item.should.eql 'each' if index is 0
next()
.on 'end', (count) ->
count.should.eql 2
next()
it 'accept key value elements', (next) ->
each()
.unshift('hello', 'each')
.unshift('youre', 'welcome')
.on 'item', (key, value, next) ->
value.should.eql 'welcome' if key is 'youre'
next()
.on 'end', (count) ->
count.should.eql 2
next()
it 'should place the next element', (next) ->
last = null
e = each(['a','b','c'])
.on 'item', (value, next) ->
if value is 'a'
e.unshift 'aa'
if last is 'a'
value.should.eql 'aa'
if last is 'aa'
value.should.eql 'b'
last = value
next()
.on 'end', (count) ->
count.should.eql 4
next()