isos

test the current OS

on mac:

    var isOs = require('isos')

    assert.ok(isOs('mac'))
    assert.ok(isOs('darwin'))
    assert.ok(isOs('osx'))

on windows:

    var isOs = require('isos')

    assert.ok(isOs('linux'))

on windows:

    var isOs = require('isos')

    assert.ok(isOs('windows'))
    assert.ok(isOs('win32'))

etc...