Chai Spies

This is an addon plugin for the chai assertion library. It provides the most basic function spy ability and tests. Though useful for small modules, you are probably going to want something more robust. Check out jack for a full featured mock/stub/spy assertion library for use with chai.

This library is primarily meant to serve as a starting point for anyone interested in developing chai plugins. If developing a module, you are welcome to use this as a starting point. I also encourage the use of the compile tools to allow modules to work both in node.js and the browser.

Installation

Node.js

Chai spies are available on npm.

  $ npm install chai-spies

Browser

Include chai-spies.js after including chai.js.

<script src="chai-spies.js"></script>

Plug In

If you are using chai-spies in the browser, there is nothing you need to do. It will detect chai in the global namespace and automatically get used.

If you are using node, here is a useful bit.

var chai = require('chai')
  , spies = require('chai-spies');
 
chai.use(spies);
 
var should = chai.should()
  , expect = chai.expect;

Building for the Browser

If you are developing an addon for chai, one thing you might find useful is the contents of the support folder. This directly contains everything that is needed to package all js files in a directory for browser use. Provided there are no external dependencies, everything will be packaged and wrapped with a CommonJS require style loader by folio, a small JS packaging tool. Please consult the comments in support/compile.js.

Chai Spies Api Reference

Creating Spies

In this module, a spy is either an empty function, or a wrapped named function. Once chai has been extended, you can create a spy through chai's own interface.

function original () {
  // do something cool 
}
 
var spy = chai.spy(original);
 
// then use in place of original 
ee.on('some event', spy);
 
// or use without original 
var spy_again = chai.spy();
ee.on('some other event', spy_again);
 
//or you can track object methods calls 
var array = [ 1, 2, 3 ];
chai.spy.on(array, 'push');
array.push(5);
 
//and you can reset the object calls 
array.push.reset();
 
//or you can create spy object 
var object = chai.spy.object([ 'push', 'pop' ]);
object.push(5);

Assertions

.spy

Asserts that object is a spy.

expect(spy).to.be.spy;
spy.should.be.spy;

.called

Assert that a spy has been called. Negation passes through.

expect(spy).to.have.been.called();
spy.should.have.been.called();

Note that called can be used as a chainable method.

.with

Assert that a spy has been called with a given argument.

expect(spy).to.have.been.called.with('foo');
spy.should.have.been.called.with('foo');

.once

Assert that a spy has been called exactly once.

expect(spy).to.have.been.called.once;
expect(spy).to.not.have.been.called.once;
spy.should.have.been.called.once;
spy.should.not.have.been.called.once;

.twice

Assert that a spy has been called exactly twice.

expect(spy).to.have.been.called.twice;
expect(spy).to.not.have.been.called.twice;
spy.should.have.been.called.twice;
spy.should.not.have.been.called.twice;

.exactly(n)

Assert that a spy has been called exactly n times.

expect(spy).to.have.been.called.exactly(3);
expect(spy).to.not.have.been.called.exactly(3);
spy.should.have.been.called.exactly(3);
spy.should.not.have.been.called.exactly(3);

.min(n) / .at.least(n)

Assert that a spy has been called minimum of n times.

expect(spy).to.have.been.called.min(3);
expect(spy).to.not.have.been.called.at.least(3);
spy.should.have.been.called.at.least(3);
spy.should.not.have.been.called.min(3);

.max(n) / .at.most(n)

Assert that a spy has been called maximum of n times.

expect(spy).to.have.been.called.max(3);
expect(spy).to.not.have.been.called.at.most(3);
spy.should.have.been.called.at.most(3);
spy.should.not.have.been.called.max(3);

.above(n) / .gt(n)

Assert that a spy has been called more than n times.

expect(spy).to.have.been.called.above(3);
expect(spy).to.not.have.been.called.gt(3);
spy.should.have.been.called.gt(3);
spy.should.not.have.been.called.above(3);

.below(n) / .lt(n)

Assert that a spy has been called fewer than n times.

expect(spy).to.have.been.called.below(3);
expect(spy).to.not.have.been.called.lt(3);
spy.should.have.been.called.lt(3);
spy.should.not.have.been.called.below(3);

Tests

Tests are written using mocha in the BDD interface. Node tests can be executed using make test. Browser tests can be seen by opening test/browser/index.html.

Contributors

project : chai-spies repo age : 3 years, 2 months active : 26 days commits : 77 files : 12 authors : 48 Jake Luer 62.3% 7 Glenn Jorde 9.1% 4 Keith Cirkel 5.2% 3 = 3.9% 3 Sergiy Stotskiy 3.9% 2 JamesMaroney 2.6% 2 PG Herveou 2.6% 2 Ryckes 2.6% 1 Veselin Todorov 1.3% 1 Steffen 1.3% 1 Daniel Walker 1.3% 1 Domenic Denicola 1.3% 1 Andre Jaenisch 1.3% 1 PG 1.3%

License

(The MIT License)

Copyright (c) 2012 Jake Luer jake@alogicalparadox.com

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.