= JSpec JSpec is a minimalistic JavaScript behavior driven development framework, providing simple installation, extremely low learning curve, absolutely no pollution to core prototypes, async request support, and incredibly sexy syntax, tons of matchers and much more. == Features * Highly readable * Framework / DOM independent * Modular via JSpec Module's and hooks * Mock Ajax Requests * Rhino support * Node.js support * Async support * Fixture support * Ruby JavaScript testing server * Nested describes * Does not pollute core object prototypes * Cascading before/after/before_each/after_each hooks * Extremely simple and intuitive matcher declaration * Over 45 core matchers * Allows parens to be optional when using matchers to increase readability * Several helpful formatters (DOM, Console, Terminal, ...) * Assertion graphs displaying how many, and which assertions pass or failed * Default / customizable evaluation contexts * DOM sandbox support * Great looking default DOM theme * `jspec` command-line utility for auto-running specs, and initializing project templates * Proxy or 'Spy' assertions * Method Stubbing * Shared behaviors * Profiling * Interactive Shell * Ruby on Rails Integration * Tiny (15 kb compressed, 1300-ish LOC) == Installation Simply download JSpec and include JSpec.css and JSpec.js in your markup. Head over to the downloads section on Github, clone this public repo, or add JSpec as a git submodule with in your project. Alternatively JSpec is also available as a Ruby Gem (though this is not required), which also provides the `jspec` executable. First install [Gemcutter](http://gemcutter.org/) then execute: $ sudo gem install jspec At which point you may: $ jspec init myproject By default, the command above will use absolute path for all JSpec library files. This behavior can be a problem when you're working across different computers or operating systems. You can freeze the library or symlink it. $ jspec init myproject --freeze $ jspec init myproject --symlink JSpec scripts should NOT be referenced via the
... You may optionally want to use sources in the /pkg directory for your project, since it includes compressed alternatives generated each release. == Example describe 'ShoppingCart' before_each cart = new ShoppingCart end describe 'addProducts' it 'should add several products' cart.addProduct('cookie') cart.addProduct('icecream') cart.should.have 2, 'products' end end describe 'checkout' it 'should throw an error when checking out with no products' -{ cart.clear().checkout() }.should.throw_error EmptyCart end end end == Grammar-less Example JSpec's grammar is optional, you may also use the equivalent grammar-less alternative below using pure JavaScript (when using the JSpec grammar you may also use grammar-less assertions): JSpec.describe('ShoppingCart', function(){ before_each(function{ cart = new ShoppingCart }) describe('addProducts', function(){ it ('should add several products', function(){ cart.addProducts('cookie') cart.addProducts('icecream') expect(cart).to(have, 2, 'products') }) }) describe('checkout', function(){ it ('should throw an error when checking out with no products', function(){ expect(function(){ cart.clear().checkout() }).to(throw_error, EmptyCart) }) }) }) == Options You may alter the way JSpec operates by assigning options via the JSpec.options hash, by passing string-based option values via the query string, or passing a hash to run(). For example JSpec.options.failuresOnly = true, and ?failuresOnly=1 will both work. * profile {bool} when enabled, uses console.time() in order to display performance information in your console log as specs are completed. (DOM, Console) * failuresOnly {bool} displays only failing specs, making them quick to discover and fix (DOM, Terminal, Server) * reportToId {string} an element id to report to when using the DOM formatter (DOM) * verbose {bool} verbose server output, defaults to false (Server) == Matchers * Core - equal, be === - be_a, be_an have constructor of x - be_an_instance_of instanceof x - be_at_least >= - be_at_most <= - be_null == null - be_empty length < 0 or {} - be_true == true - be_false == false - be_type be type of x - be_greater_than > - be_less_than < - be_undefined check if variable passed is undefined - throw_error should throw an error, optionally supply the error string or regexp for message comparison - have object should have n of property (person.should.have(2, 'pets')) - have_at_least object should have at least n of property - have_at_most object should have a maximum n of property - have_within object should have within n..n of property (person.should.have_within(1..3, 'pets') - have_length length of n - have_prop object should have property x, optionally supplying an expected value - have_property strict version of have_prop - be_within checks if n is within the range passed - include include substring, array element, or hash key - match string should match regexp x - respond_to property x should be a function - eql matches simple literals (strings, numbers) with == However composites like arrays or 'hashes' are recursively matched, meaning that [1, 2, [3]].should_eql([1, 2, [3]]) will be true. * jQuery - have_tag, have_one have exactly one tag - have_tags, have_many have more than one tag - have_child have exactly one child - have_children have more than one child - have_text have plain text - have_attr have an attribute, with optional value - have_type - have_id - have_title - have_alt - have_href - have_rel - have_rev - have_name - have_target - have_value - have_class - have_classes - be_visible - be_hidden - be_enabled - be_disabled - be_selected - be_checked == Async Support With Mock Timers The javascript mock timers library is available at http://github.com/visionmedia/js-mock-timers although it is already bundled with JSpec at lib/jspec.timers.js Timers return ids and may be passed to clearInterval(), however they do not execute in threads, they must be manually scheduled and controlled via the tick() function. setTimeout(function(){ alert('Wahoo!') }, 400) tick(200) // Nothing happens tick(400) // Wahoo! setInterval() works as expected, although it persists, where as setTimeout() is destroyed after a single call. As conveyed by the last tick() call below, a large increment in milliseconds may cause the callbacks to be called several times to 'catch up'. progress = '' var id = setInterval(function(){ progress += '.' }, 100) tick(50), print(progress) // '' tick(50), print(progress) // '.' tick(100), print(progress) // '..' tick(100), print(progress) // '...' tick(300), print(progress) // '......' clearInterval(id) tick(800) // Nothing happens You may also reset at any time using resetTimers() == Proxy Assertions Proxy or 'Spy' assertions allow you to assert that a method is called n number of times, with x arguments, returning x value. For example: person = { getPets : function(species){ return ['izzy'] }} person.should.receive('getPets', 'twice').with_args(an_instance_of(String))and_return(['izzy']) person.getPets('dog') // This will pass person.getPets() // This will fail because we asked an instance of String This is a useful mechanism for testing the behavior of your object, as well as how other methods may interact with it. Below is another example: array = ['foo', 'bar'] array.should.receive('toString').and_return('foo,bar') 'array: ' + array // This line causes the spec to pass due to calling toString() For more examples view spec/spec.matchers.js == Method Stubbing JSpec currently provides very simple stubbing support shown below: person = { toString : function(){ return 'Foo
') // or html = $('Foo
') ... end it 'should do something' html.should.have_text 'Foo' end end == Custom Matchers First lets create a simple equality matcher. In the case below JSpec is smart enough to realize this is simply a binary operator, and simply transforms this into 'actual === expected' JSpec.addMatchers({ equal : '===' }) To alias a method to keep your specs readable you may alias them like below: JSpec.addMatchers({ be : 'alias equal' }) 'foo'.should.equal 'foo' true.should.be true Matchers with string bodies implicitly return the expression value. The expanded version of the equal matcher would then be: JSpec.addMatchers({ equal : 'actual === expected' }) Large matchers or those which require several parameters may wish to utilize the hash method: JSpec.addMatchers({ equal : { match : function(actual, expected){ return actual === expected }} }) To keep JSpec tiny, JSpec will default to generating failure messages for you, how ever this can be explicitly defined: JSpec.addMatchers({ equal : { match : function(actual, expected){ return actual === expected }, message : function(actual, expected, negate) { return 'a message here' } } }) When defining matchers that are extremely similar in functionality, however require different names, you may use a prefixed list of words like below which defines be_disabled, be_selected, be_checked, and have_type, have_id, etc. Each function must return the matcher body which will be used. JSpec.addMatchers({ 'be disabled selected checked' : function(attr) { return 'jQuery(actual).attr("' + attr + '")' }, 'have type id title alt href src sel rev name target' : function(attr) { return function(actual, value) { return value ? jQuery(actual).attr(attr) == value: jQuery(actual).attr(attr) } } }) == Extending Or Hooking Into JSpec JSpec provides a hook architecture for extending or analyzing various points in its execution, through the use of 'Modules'. For a Module example view lib/jspec.jquery.js. The following methods or properties are utilized by JSpec: - name : module name string - init : called to initialize a module - formatters : hash of formatters merged with JSpec.formatters - utilities : hash of utility functions merged with JSpec.defaultContext - matchers : hash of matchers merged with JSpec's core matchers via JSpec.addMatchers() - DSLs : hash of DSL methods; for example DSLs.snake contains before_each, after_each, etc. Where as DSLs.camel may contain beforeEach, afterEach, etc. Below is a list of hooks, descriptions, and valid return values which may simply be implemented as module methods. beforeSuite, afterSuite, beforeSpec, and afterSpec have lower precedence than before_each, after_each etc within the specs themselves, allowing them to override or undo anything that has been done by a Module. - running(options) : started running JSpec with the options passed : returning 'stop' will halt running - loading(file) : loading a file : returning 'stop' will prevent loading - executing(file) : executing a file : returning 'stop' will prevent execution - posting(data, url) : posting data to a url : returning 'stop' will prevent request - preprocessing(input) : before input string is preprocessed : return input string for next hook to preprocess - stubbing(object, method, result) : called when stubbing an object's method, and return value (result). : (no return value) - requiring(dependency, message) : requiring a dependency : (no return value) - beforeAssertion(assertion) : before an assertion has been made : (no return value) - afterAssertion(assertion) : after an assertion has been made : (no return value) - addingMatcher(name, body) : unprocessed matcher name and body : (no return value) - addingSuite(suite) : adding Suite instance to JSpec : (no return value) - beforeSuite(suite) : before running of suite (describe block) : (no return value) - afterSuite(suite) : after running of suite (describe block) : (no return value) - beforeSpec(spec) : before running of spec (it block) : (no return value) - afterSpec(spec) : after running of spec (it block) : (no return value) - reporting(options) : called before reporting : (no return value) - evaluatingBody(dsl, matchers, context, contents) : evaluating body contents, with the given context, matchers and dsl. : (no return value) For example you may wish to proxy files which are being executed, simply implement the executing method like below. This example will stop execution of any file matching /matchers/. MyModule = { executing : function(file) { if (file.match(/matchers/)) return 'stop' } } JSpec.include(MyModule) Immutable values may also be passed to hooks using hookImmutable() internally. This allows for simple numbers, strings, etc to be utilized or altered within a hook implementation. Below is an example module which adds functionality to the JSpec grammar by converting SomeObject.stub('method') to stub(SomeObject, 'method'): JSpec.include({ preprocessing : function(input) { return input.replace(/(\w+)\.(stub|destub)\((.*?)\)$/gm, '$2($1, $3)') } }) == JSpec Command-line Utility When installed as a Ruby Gem, the `jspec` executable will become available, allowing you to initialize project templates quickly, as well as auto-testing specifications when a file is altered. Initialize JSpec-driven project template in directory 'myproject': $ jspec init myproject Once within 'myproject' start testing by executing: $ jspec For additional usage execute: $ jspec help Or for specific usage: $ jspec help run == Rhino JSpec provides transparent support for Rhino, while using the Terminal formatter. Simply create a JavaScript file with contents similar to below, and then execute the command following it: load('lib/jspec.js') JSpec .exec('spec/spec.grammar.js') .exec('spec/spec.core.js') .run({ formatter : JSpec.formatters.Terminal, failuresOnly : true }) .report() Initialize project with: $ jspec init myproject Run with: $ jspec run --rhino Or bind (automated testing): $ jspec --rhino == Server The Ruby JavaScript testing server included with JSpec simply runs the spec suites within each browser you specify, while reporting result back to the terminal. It is essentially the same as using the DOM formatter and auto-testing each browser, however results are centralized to the terminal, removing the need to manually view each browser's output. When utilizing the server if a file named spec/jspec.rb (or jspec/jspec.rb for rails) is present, then it will be loaded before the server is started. This allows you to add Sinatra routes, support additional Browsers, etc. Run with all supported browsers: $ jspec run --server Run with specific browsers: $ jspec run --browsers Safari,Firefox,Chrome,Explorer Run with alternative browser names: $ jspec run --browsers safari,ff,chrome,ie Browsers supported in core: Browser::Safari Browser::Chrome Browser::Opera Browser::Firefox Browser::IE Supplied routes: /slow/NUMBER /status/NUMBER For example $.get('/slow/4', function(){}) will take 4 seconds to reply, where as $.get('/status/404', function(){}) will respond with an 404 status code. Add additional Sinatra routes to the jspec.rb file to add your own functionality. == Interactive Shell JSpec provides an interactive shell through Rhino, utilize with: $ jspec shell Or to specify additional files to load: $ jspec shell lib/*.js Or view additional shell help $ jspec help shell == Ruby on Rails No additional gems are required for JSpec to work with rails, although http://github.com/bhauman/jspec-rails has been created by 'bhauman'. JSpec supports Rails out of the box, simply execute: $ jspec init --rails Then while still in the root directory of your Rails project, run the following command which will bind to, and refresh your browsers automatically when any changes are made to ./public/javascripts/*.js or ./jspec/*.js $ jspec Or just like regular JSpec applications, run once: $ jspec run Or run via the terminal using Rhino: $ jspec run --rhino == Support Browsers Browsers below are supported and can be found in server/browsers.rb, however your spec/server.rb file may support additional browsers. * Safari * Chrome * Firefox * Opera * Internet Explorer == Known Issues * Tabs may cause a parse error. To prevent this use 'soft tabs' (setting in your IDE/Editor) or use JSpec's grammar-less alternative (mentioned above). * The preprocessor is not (yet) capable of multiline conversions. For example the following is invalid object.stub('getContentsOfURL').and_return(function(url){ return 'html' }) In cases such as this, you may always revert to utilizing JSpec in a grammar-less form as follows: stub(object, 'getContentsOfURL').and_return(function(url){ return 'html' }) == Additional JSpec Modules * JSocka stubbing http://github.com/gisikw/jsocka/tree/master == More Information * IRC Channel irc://irc.freenode.net#jspec * Featured article in JSMag: http://www.jsmag.com/main.issues.description/id=21/ * Syntax comparison with other frameworks http://gist.github.com/92283 * Get the TextMate bundle at https://github.com/visionmedia/jspec.tmbundle/tree * For more information consult the JSpec source code documentation or visit http://visionmedia.github.com/jspec * jQuery + HTML fixture example http://gist.github.com/147831 == Contributors Many ideas and bug reports were contributed by the following developers, thankyou for making JSpec more enjoyable, and bug free ;) * Lawrence Pit * mpd@jesters-court.ne * kevin.gisi@gmail.com * tony_t_tubbs@yahoo.com * enno84@gmx.net * fnando == License (The MIT License) Copyright (c) 2008 - 2009 TJ Holowaychuk