gistfile1.coffee

assert = require('assert')

class MyError
  constructor: (@message, @name='bar') -> #nop

try
  throw new Error('baz')
  throw new MyError('foo')
catch err
  console.log err.message
  console.log err.name

# ok 
assert.throws (-> throw new MyError('foo')), MyError

# fail
assert.throws (-> throw new Error('plain')), MyError