TDD e Javascript (senza framework)

These are the slides for the presentation that I should have given at Italian Agile Day 2016 (but I had the flu!).

Please see the home-recorded video of this presentation: https://vimeo.com/194470329

Also check out the code on github: https://github.com/xpmatteo/frameworkless-tdd-todomvc

Transcript

1. TDD e JavaScript Matteo Vaccari
3. https://gist.github.com/Restuta/cda69e50a853aa64912d
4. http://todomvc.com/
6. No todos When there are no todos, #main and #footer should be hidden. New todo New todos are entered in the input at the top of the app. The input element should be focused when the page is loaded, preferably by using the autofocus input attribute. Pressing Enter creates the todo, appends it to the todo list, and clears the input. Make sure to .trim() the input and then check that it's not empty before creating a new todo. Mark all as complete This checkbox toggles all the todos to the same state as itself. Make sure to clear the checked state after the "Clear completed" button is clicked. The "Mark all as complete" checkbox should also be updated when single todo items are checked/unchecked. Eg. When all the todos are checked it should also get checked. Item A todo item has three possible interactions: 1 Clicking the checkbox marks the todo as complete by updating its completed value and toggling the class completed on its parent <li> 2 Double-clicking the <label> activates editing mode, by toggling the .editing class on its <li> 3 Hovering over the todo shows the remove button (.destroy) Editing When editing mode is activated it will hide the other controls and bring forward an input that contains the todo title, which should be focused (.focus()). The edit should be saved on both blur and enter, and the editing class should be removed. Make sure to .trim() the input and then check that it's not empty. If it's empty the todo should instead be destroyed. If escape is pressed during the edit, the edit state should be left and any changes be discarded. Counter Displays the number of active todos in a pluralized form. Make sure the number is wrapped by a <strong> tag. Also make sure to pluralize the item word correctly: 0 items, 1 item, 2 items. Example: 2 items left Clear completed button Removes completed todos when clicked. Should be hidden when there are no completed todos. Persistence Your app should dynamically persist the todos to localStorage. If the framework has capabilities for persisting data (e.g. Backbone.sync), use that. Otherwise, use vanilla localStorage. If possible, use the keys id, title, completed for each item. Make sure to use this format for the localStorage name: todos-[framework]. Editing mode should not be persisted. Routing Routing is required for all implementations. If supported by the framework, use its built-in capabilities. Otherwise, use the Flatiron Director routing library located in the /assets folder. The following routes should be implemented: #/ (all - default), #/active and #/completed (#!/ is also allowed). When the route changes, the todo list should be filtered on a model level and the selected class on the filter links should be toggled. When an item is updated while in a filtered state, it should be updated accordingly. E.g. if the filter is Active and the item is checked, it should be hidden. Make sure the active filter is persisted on reload.
8. CONSIGLI PER INIZIARE BENE CON TDD ▫︎Inizia descrivendo il problema con esempi ▫︎Evita di specificare l’implementazione nei test 8
9. 1. Rendering
10. LA PRIMA TEST LIST 10 Empty list --> <ul></ul>
 
 One item --> <ul>
 <li>Pippo</li>
 </ul>
 
 Two items --> <ul>
 <li>Pippo</li>
 <li>Pluto</li>
 </ul>
11. IL PRIMO TEST 11 Empty list --> <ul></ul>
 
 One item --> <ul>
 <li>Pippo</li>
 </ul>
 
 Two items --> <ul>
 <li>Pippo</li>
 <li>Pluto</li>
 </ul>
12. IL SECONDO TEST 12 Empty list --> <ul></ul>
 
 One item --> <ul>
 <li>Pippo</li>
 </ul>
 
 Two items --> <ul>
 <li>Pippo</li>
 <li>Pluto</li>
 </ul>
13. IL SECONDO TEST/2 13
14. IL SECONDO TEST/3 14
15. TRE DIVERSE IDEE DI TEST (FRA LE MOLTE POSSIBILI) 15 it('can have one element', function() {
 var fixture = document.createElement('div'); var todoList = ['Pippo'];
 var view = new TodoListView(todoList);
 
 fixture.innerHTML = view.render();
 
 expect(fixture.querySelector('ul.todo-list li label').textContent).equal('Pippo');
 }); Functional: the view returns html Imperative: the view changes its “target” it('renders a list of one element', function() {
 var fixture = document.createElement('div');
 var todoList = ['Pippo']
 var view = new TodoListView(todoList, fixture);
 
 view.render();
 
 expect(fixture.querySelector('ul.todo-list li label').textContent).equal('Pippo');
 }); The view finds and changes a pre-existing template it('renders a list of one element', function() { 
 var fixture = document.createElement('div');
 fixture.innerHTML('<ul class="todo-list"></ul>')
 var todoList = ['Pippo'] 
 var view = new TodoListView(todoList, fixture); 
 view.render(); 
 expect(fixture.querySelector('ul.todo-list li label').textContent).equal('Pippo');

16. 2. Rispondere ai click
17. TORNIAMO ALLA TEST LIST 17 Inserisco “Pippo” —-> not checked clicco su “Pippo” —-> checked clicco due volte su “Pippo” —> not checked
18. SVILUPPARE LA BUSINESS LOGIC NEL MODELLO 18
19. SIMULARE I CLICK DELL’UTENTE 19
20. COSA DEVE FARE IL CODICE DI PRODUZIONE? ▫︎Rendere il TodoItem in html ▫︎Definire l’onchange handler 20
21. 3. One model, many views
22. Appears when at least one item is “done” Changes appearance when all items are “done” Changes whenever an item is created, checked, unchecked or deleted
23. OUR OLD FRIEND, THE OBSERVER 23
24. OUR OLD FRIEND, THE OBSERVER 24
25. OUR OLD FRIEND, THE OBSERVER 25
26. RENDERE I MODELLI OSSERVABILI 26
27. RIDISEGNARE LE VISTE QUANDO I MODELLI CAMBIANO 27
28. MAIN 28
29. CONFRONTO LINEE DI CODICE 29 1204 typescript-angular 793 aurelia 594 puremvc 564 vanillajs 481 vanilla-es6 383 polymer 321 xpmatteo-tdd-vanillajs 265 angular2/app 256 angularjs/js 214 backbone/js 164 react-alt/js 98 react/js Abbiamo meno LOC di alcune implementazioni basate su framework! http://matteo.vaccari.name/blog/ Qui non contiamo le 11K LOC del framework…
30. PER IL PROSSIMO EVENTO TDD A MILANO… 30 Please subscribe!
31. matteo.vaccari.name/blog twitter.com/xpmatteo thoughtworks.com GRAZIE Assumiamo! Tutto il codice si trova qui: https://github.com/xpmatteo