test.js

'use strcit'

var Promise     = require('bluebird');

function findUser(id) {
//    return Promise.resolve({id: id})
    return Promise.reject('not found')
}

var user = findUser(12)
user.catch(function(e){ console.log('catch1-1:' + e)}).catch(function(e){ console.log('catch1-2:' + e)})
user.then(function(u){ console.log('u:'+u)}).catch(function(e){console.log('catch2-1:'+e)}).catch(function(e){console.log('catch2-2:'+e)})

/*
catch1-1:not found
catch2-1:not found

と両方でキャッチされる
*/