Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
Writing Testable JavaScript
Search
Rebecca Murphey
November 09, 2012
Technology
29
5.9k
Writing Testable JavaScript
Slides from my 2012 Full Frontal presentation.
Rebecca Murphey
November 09, 2012
Tweet
Share
More Decks by Rebecca Murphey
See All by Rebecca Murphey
You Can't Always Get What You Want: A Year of Leading Change
rmurphey
0
230
Making It Better Without Making It Over (Front Porch)
rmurphey
1
200
CascadiaJS: Making it Better Without Making it Over
rmurphey
2
160
Making it Better without Making it Over
rmurphey
1
220
Making It Better Without Making It Over
rmurphey
0
320
HTTP/2 is here, now let's make it easy
rmurphey
7
8.8k
Deploying client-side apps, 1000 (or so) at a time
rmurphey
1
350
Apps That Talk Back (Codementor)
rmurphey
1
6.4k
Ain't No Party Like a Third-Party JS Party
rmurphey
1
270
Other Decks in Technology
See All in Technology
技術負債の「予兆検知」と「状況異変」のススメ / Technology Dept
i35_267
1
1k
急成長する企業で作った、エンジニアが輝ける制度/ 20250214 Rinto Ikenoue
shift_evolve
2
1.1k
Nekko Cloud、 これまでとこれから ~学生サークルが作る、 小さなクラウド
logica0419
2
880
ホワイトボードチャレンジ 説明&実行資料
ichimichi
0
120
データの品質が低いと何が困るのか
kzykmyzw
6
1.1k
OpenID BizDay#17 KYC WG活動報告(法人) / 20250219-BizDay17-KYC-legalidentity
oidfj
0
140
転生CISOサバイバル・ガイド / CISO Career Transition Survival Guide
kanny
3
920
オブザーバビリティの観点でみるAWS / AWS from observability perspective
ymotongpoo
8
1.3k
データマネジメントのトレードオフに立ち向かう
ikkimiyazaki
3
300
速くて安いWebサイトを作る
nishiharatsubasa
9
11k
エンジニアの育成を支える爆速フィードバック文化
sansantech
PRO
3
990
プロセス改善による品質向上事例
tomasagi
2
2.2k
Featured
See All Featured
Improving Core Web Vitals using Speculation Rules API
sergeychernyshev
9
430
GitHub's CSS Performance
jonrohan
1030
460k
Product Roadmaps are Hard
iamctodd
PRO
50
11k
Intergalactic Javascript Robots from Outer Space
tanoku
270
27k
Let's Do A Bunch of Simple Stuff to Make Websites Faster
chriscoyier
507
140k
Optimizing for Happiness
mojombo
376
70k
GraphQLの誤解/rethinking-graphql
sonatard
68
10k
Helping Users Find Their Own Way: Creating Modern Search Experiences
danielanewman
29
2.4k
Being A Developer After 40
akosma
89
590k
Writing Fast Ruby
sferik
628
61k
Testing 201, or: Great Expectations
jmmastey
42
7.2k
Understanding Cognitive Biases in Performance Measurement
bluesmoon
27
1.5k
Transcript
Writing Testable JavaScript Rebecca Murphey • Full Frontal 2012 ©
brianUphoto http://www.flickr.com/photos/snype451/5752753663/in/photostream/ Friday, November 9, 12
rmurphey.com • @rmurphey • bocoup.com Friday, November 9, 12
Writing Testable JavaScript Rebecca Murphey • Full Frontal 2012 ©
brianUphoto http://www.flickr.com/photos/snype451/5752753663/in/photostream/ Friday, November 9, 12
Friday, November 9, 12
Friday, November 9, 12
Friday, November 9, 12
you will design your code you will test your code
you will refactor your code other people will use your code there will be bugs facts of life Friday, November 9, 12
Friday, November 9, 12
var resultsList = $( '#results' ); var liked = $(
'#liked' ); var pending = false; $( '#searchForm' ).on( 'submit', function( e ) { e.preventDefault(); if ( pending ) { return; } var form = $( this ); var query = $.trim( form.find( 'input[name="q"]' ).val() ); if ( !query ) { return; } pending = true; $.ajax( '/data/search.json', { data : { q: query }, dataType : 'json', success : function( data ) { var tmpl = _.template( $('#tmpl-‐people-‐detailed').text() ); resultsList.html(tmpl({ people : data.results })); pending = false; } }); $('<li>', { 'class' : 'pending', html : 'Searching …' }).appendTo( resultsList.empty() ); }); Friday, November 9, 12
“do the pieces work together as expected?” integration tests Friday,
November 9, 12
def test_no_results fill_in('q', :with => 'foobarbazbimbop') find('.btn').click
assert( page.has_selector?('#results li.no-‐results'), 'No results is shown' ) assert( find('#results').has_content?('No results found'), 'No results message is shown' ) end selenium (via ruby) Friday, November 9, 12
Friday, November 9, 12
Friday, November 9, 12
“given input x, is the output y?” unit tests Friday,
November 9, 12
var resultsList = $( '#results' ); var liked = $(
'#liked' ); var pending = false; $( '#searchForm' ).on( 'submit', function( e ) { e.preventDefault(); if ( pending ) { return; } var form = $( this ); var query = $.trim( form.find( 'input[name="q"]' ).val() ); if ( !query ) { return; } pending = true; $.ajax( '/data/search.json', { data : { q: query }, dataType : 'json', success : function( data ) { var tmpl = _.template( $('#tmpl-‐people-‐detailed').text() ); resultsList.html(tmpl({ people : data.results })); pending = false; } }); $('<li>', { 'class' : 'pending', html : 'Searching …' }).appendTo( resultsList.empty() ); }); Friday, November 9, 12
anonymous functions, lack of structure complex, oversized functions lack of
con gurability hidden or shared state tightly coupled difficult to test Friday, November 9, 12
var resultsList = $( '#results' ); var liked = $(
'#liked' ); var pending = false; $( '#searchForm' ).on( 'submit', function( e ) { e.preventDefault(); if ( pending ) { return; } var form = $( this ); var query = $.trim( form.find( 'input[name="q"]' ).val() ); if ( !query ) { return; } pending = true; $.ajax( '/data/search.json', { data : { q: query }, dataType : 'json', success : function( data ) { var tmpl = _.template( $('#tmpl-‐people-‐detailed').text() ); resultsList.html(tmpl({ people : data.results })); pending = false; } }); $('<li>', { 'class' : 'pending', html : 'Searching …' }).appendTo( resultsList.empty() ); }); var resultsList = $( '#results' ); var liked = $( '#liked' ); var pending = false; $( '#searchForm' ).on( 'submit', function( e ) { // ... }); Friday, November 9, 12
var resultsList = $( '#results' ); var liked = $(
'#liked' ); var pending = false; $( '#searchForm' ).on( 'submit', function( e ) { e.preventDefault(); if ( pending ) { return; } var form = $( this ); var query = $.trim( form.find( 'input[name="q"]' ).val() ); if ( !query ) { return; } pending = true; $.ajax( '/data/search.json', { data : { q: query }, dataType : 'json', success : function( data ) { var tmpl = _.template( $('#tmpl-‐people-‐detailed').text() ); resultsList.html(tmpl({ people : data.results })); pending = false; } }); $('<li>', { 'class' : 'pending', html : 'Searching …' }).appendTo( resultsList.empty() ); }); $.ajax( '/data/search.json', { data : { q: query }, dataType : 'json', success : function( data ) { var tmpl = _.template( $('#tmpl-‐people-‐detailed').text() ); resultsList.html(tmpl({ people : data.results })); pending = false; } }); Friday, November 9, 12
Friday, November 9, 12
setup presentation & interaction application state data/server communication Friday,
November 9, 12
Friday, November 9, 12
search data application state glue Friday, November 9, 12
use constructors to create instances support con gurability keep methods
simple don’t intermingle responsibilities guiding principles Friday, November 9, 12
test rst. Friday, November 9, 12
var liked = $( '#liked' ); var resultsList = $(
'#results' ); // ... resultsList.on( 'click', '.like', function(e) { e.preventDefault(); var name = $( this ).closest( 'li' ).find( 'h2' ).text(); liked.find( '.no-‐results' ).remove(); $( '<li>', { text: name } ).appendTo( liked ); }); Friday, November 9, 12
test('create a likes view', function() { var view =
new app.Views.Likes({ el: '#likes' }); ok( view ); }); Friday, November 9, 12
test('add a liked person', function() { var view =
new app.Views.Likes({ el: '#likes' }); view.add( 'Brendan Eich' ); ok( $('#likes').html().match('Brendan Eich') ); }); Friday, November 9, 12
app.Views.Likes = (function() { var Likes = function( settings
) { this.$el = $( settings.el ); }; Likes.prototype.add = function( name ) { this.$el.find( '.no-‐results' ).remove(); $( '<li>', { html : name } ).appendTo( this.$el ); }; return Likes; }()); Friday, November 9, 12
$.ajax( '/data/search.json', { data : { q: query },
dataType : 'json', success : function( data ) { var tmpl = _.template( $('#tmpl-‐people-‐detailed').text() ); resultsList.html( tmpl({ people : data.results }) ); pending = false; } }); Friday, November 9, 12
test('adding search results', function() { var view = new
app.Views.SearchResults({ el: '#results' }); view.setData([ { name: 'Rebecca', company: { name: 'Bocoup' }, email: 'rebecca@ { name: 'Dan', company: { name: 'Bocoup' }, email: '
[email protected]
]); var html = $( '#results' ).html(); ok( html.match( 'Rebecca' ) ); ok( html.match( 'Dan' ) ); equal( $( '#results li' ).length, 2 ); }); Friday, November 9, 12
app.Views.SearchResults = (function() { var SearchResults = function( settings
) { this.app = settings.app; this.$el = $( settings.el ); }; SearchResults.prototype.set = function( people ) { var $el = this.$el.empty(); return app.loadTemplate( 'people-‐detailed.tmpl' ) .done(function( t ) { $el.html( t( { people : people } ) ); }); }; return SearchResults; }()); Friday, November 9, 12
test('search data URL', function() { var search = new
app.Search(); var result = search.fetch( 'cat' ); equal( requests[0].url, '/data/search.json?q=cat' ); }); Friday, November 9, 12
module('search data', { setup : function() {
xhr = sinon.useFakeXMLHttpRequest(); requests = []; xhr.onCreate = function( req ) { requests.push( req ); }; }, teardown : function() { xhr.restore(); } }); Friday, November 9, 12
test('fetch returns a promise', function() { var search =
new app.Search(); var result = search.fetch( 'cat' ); ok( result.then ); }); Friday, November 9, 12
test('promise resolves with array', function() { var search =
new app.Search(); var result = search.fetch( 'cat' ); requests[0].respond( 200, { "Content-‐type" : "text/json" }, JSON.stringify( { results : [ 'cat' ] } ) ); result.done(function( data ) { equal( data[0], 'cat' ); }); }); Friday, November 9, 12
app.Search = (function() { var Search = function() {};
var processResults = function( resp ) { return resp.results; }; Search.prototype.fetch = function( query ) { return $.getJSON( '/data/search.json', { q : query }).pipe( processResults ); }; return Search; }()); Friday, November 9, 12
so. Friday, November 9, 12
where to start? Friday, November 9, 12
awesome tools grunt + qunit + phantomjs grunt-mocha grunt-jasmine sinon.js
chai.js Friday, November 9, 12
$ grunt init:gruntfile Friday, November 9, 12
Friday, November 9, 12
/*global module:false*/ var child_process = require('child_process'); module.exports = function(grunt) {
// Project configuration. grunt.initConfig({ lint: { files: ['lib/**/*.js', 'test/**/*.js', '! test/lib/**/*.js', 'www/js/**/*.js'] }, qunit: { files: ['test/**/test-‐*.html'] }, watch: { files: [ '<config:lint.files>', 'www/templates/*.tmpl' ], tasks: 'test' }, jshint: { options: { curly: true, eqeqeq: true, immed: true, latedef: true, newcap: true, noarg: true, sub: true, undef: true, boss: true, eqnull: true, browser: true }, globals: { $ : true, _ : true, RSVP : true, app : true } }, uglify: {} }); grunt.registerTask('default', 'lint qunit'); }; Friday, November 9, 12
/*global module:false*/ var child_process = require('child_process'); module.exports = function(grunt) {
// Project configuration. grunt.initConfig({ lint: { files: ['lib/**/*.js', 'test/**/*.js', '! test/lib/**/*.js', 'www/js/**/*.js'] }, qunit: { files: ['test/**/test-‐*.html'] }, watch: { files: [ '<config:lint.files>', 'www/templates/*.tmpl' ], tasks: 'test' }, jshint: { options: { curly: true, eqeqeq: true, immed: true, latedef: true, newcap: true, noarg: true, sub: true, undef: true, boss: true, eqnull: true, browser: true }, globals: { $ : true, _ : true, RSVP : true, app : true } }, uglify: {} }); grunt.registerTask('default', 'lint qunit'); }; qunit: { files: ['test/**/test-‐*.html'] }, Friday, November 9, 12
Friday, November 9, 12
Friday, November 9, 12
pinboard.in/u:rmurphey/t:testable-‐javascript/ bit.ly/WL0R8U Friday, November 9, 12
rmurphey.com • @rmurphey • bocoup.com Friday, November 9, 12