basic.js
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var test = require('tap').test
var wrappy = require('../wrappy.js')
test('basic', function (t) {
function onceifier (cb) {
var called = false
return function () {
if (called) return
called = true
return cb.apply(this, arguments)
}
}
onceifier.iAmOnce = {}
var once = wrappy(onceifier)
t.equal(once.iAmOnce, onceifier.iAmOnce)
var called = 0
function boo () {
t.equal(called, 0)
called++
}
// has some rando property
boo.iAmBoo = true
var onlyPrintOnce = once(boo)
onlyPrintOnce() // prints 'boo'
onlyPrintOnce() // does nothing
t.equal(called, 1)
// random property is retained!
t.equal(onlyPrintOnce.iAmBoo, true)
var logs = []
var logwrap = wrappy(function (msg, cb) {
logs.push(msg + ' wrapping cb')
return function () {
logs.push(msg + ' before cb')
var ret = cb.apply(this, arguments)
logs.push(msg + ' after cb')
}
})
var c = logwrap('foo', function () {
t.same(logs, [ 'foo wrapping cb', 'foo before cb' ])
})
c()
t.same(logs, [ 'foo wrapping cb', 'foo before cb', 'foo after cb' ])
t.end()
})