Errata

The link in this sentence: The more code you have, the [greater the chance it will have bugs in it]. Points at this address: http://bit.ly/XUdmPf But a visit to that address goes to http://www.enerjy.com/techpaper-2008-01-02.pdf THAT page is not loading. I realize this probably falls under the category of "Not Your Responsibility/Problem" but it does harm the value of the link in that sentence. You went to the trouble of trying to point at that link, so either issue an update that removes that link, or adjust the Bit.ly link to point at a cached copy of that link on Google. I found this on Google: http://webcache.googleusercontent.com/search?q=cache:opegFTu7AfkJ:enerjy.com/techpaper-2008-01-02.pdf+&cd=1&hl=en&ct=clnk&gl=us BTW, thanks for the book so far -- it's illuminating!

Note from the Author or Editor:
please change the link to point to: http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.130.7149&rep=rep1&type=pdf instead

How can you call the addUser() function? Isn't it outside of scope in the test code? Would you need to use the eventHub mock to get a reference to the function when eventHub.on('CREATE_USER', addUser) is called in the DB function or what am I missing?

Note from the Author or Editor:
Ok code on page 69 needs to be changed to: // Some handle to a datastore function DB(eventHub, dbHandle) { // Add user function eventHub.on('CREATE_USER', createAddUserHandler(eventHub, dbHandle)); } function createAddUserHandler(eventHub, dbHandle) { return function addUser(user) { var result = dbHandle.addRow('user', user); eventHub.fire('USER_CREATED', { success: result.success , message: result.message , user: user }); } } code on page 70 should be changed to: YUI().use('test', function(Y) { var eventHub = Y.Mock() , addUserTests = new Y.Test.Case({ name: 'add user' , testAddOne: function() { var user = { user_id: 'mark' } , dbHandle = { // DB stub addRow: function(user) { return { user: user , success: true , message: 'ok' }; } } , addUser = createAddUserHandler(eventHub, dbHandle) ; Y.Mock.expect( eventHub , 'fire' , [ 'USER_CREATED' , { success: true, message: 'ok', user: user } ] ); DB(eventHub, dbHandle); // Inject test versions addUser(user); Y.Mock.verify(eventHub); } }); eventHub.on = function(event, func) {}; eventHub.fire = function(event, data) {}; Y.Test.Runner.add(addUserTests); Y.Test.Runner.run(); });