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
240
Making It Better Without Making It Over (Front Porch)
rmurphey
1
210
CascadiaJS: Making it Better Without Making it Over
rmurphey
2
180
Making it Better without Making it Over
rmurphey
1
230
Making It Better Without Making It Over
rmurphey
0
330
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
360
Apps That Talk Back (Codementor)
rmurphey
1
6.4k
Ain't No Party Like a Third-Party JS Party
rmurphey
1
280
Other Decks in Technology
See All in Technology
Cloud Run を解剖して コンテナ監視を考える / Breaking Down Cloud Run to Rethink Container Monitoring
aoto
PRO
0
110
テストを実施する前に考えるべきテストの話 / Thinking About Testing Before You Test
nihonbuson
PRO
13
2k
AIコードエディタは開発を変えるか?Cursorをチームに導入して1ヶ月経った本音
ota1022
1
690
Slackひと声でブログ校正!Claudeレビュー自動化編
yusukeshimizu
3
170
AIの電力問題を概観する
rmaruy
1
210
OTel meets Wasm: プラグイン機構としてのWebAssemblyから見る次世代のObservability
lycorptech_jp
PRO
1
300
TypeScript と歩む OpenAPI の discriminator / OpenAPI discriminator with TypeScript
kaminashi
1
150
Roo Codeにすべてを委ねるためのルール運用
pharma_x_tech
1
220
コードの考古学 〜労務システムから発掘した成長の糧〜
kenta_smarthr
1
1.1k
【5分でわかる】セーフィー エンジニア向け会社紹介
safie_recruit
0
24k
“⾞が通れるほど⼤きな”セキュリティーホールを抑えながらログインしたい
taiseiue
0
160
SmartHRの複数のチームにおけるMCPサーバーの活用事例と課題
yukisnow1823
2
1.1k
Featured
See All Featured
Mobile First: as difficult as doing things right
swwweet
223
9.6k
Building a Modern Day E-commerce SEO Strategy
aleyda
40
7.3k
Gamification - CAS2011
davidbonilla
81
5.3k
Imperfection Machines: The Place of Print at Facebook
scottboms
267
13k
What’s in a name? Adding method to the madness
productmarketing
PRO
22
3.5k
The Cost Of JavaScript in 2023
addyosmani
49
8.1k
Into the Great Unknown - MozCon
thekraken
39
1.8k
Code Reviewing Like a Champion
maltzj
523
40k
Building Applications with DynamoDB
mza
95
6.4k
Embracing the Ebb and Flow
colly
85
4.7k
How STYLIGHT went responsive
nonsquared
100
5.6k
Building Adaptive Systems
keathley
41
2.6k
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: 'dan@bocoup.c ]); 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