cappuccino

hot mocking library on jasmine and node.js

It's built on jasmine and node.js, using the Arrange-Act-Assert pattern and extending jasmine-node for running tests from command-line.

How it works

You still write your jasmine specs, but by running them with cappuccino, it loads its mocking functions into the same context that jasmine has its testing functions, then it runs your specs with jasmine-node.

Installation

Using the node package manager

$ npm install cappuccino

Quick Start

Given the following User class

function User(name) {
  this.name = name;
  this.toString = function() {
    return "User name: " + this.name;
  };
  this.meet = function(someone) {
    return "Nice to meet you " + someone;
  };
}

Write a jasmine spec

describe('User meetings', function () {
  it('should meet people like', function () {
    // ...
  });
});

Mock an existent object

var user = new User('functioncallback');
var mockedUser = mock(user);

Stub a method to return a value

upon(mockedUser).toString().thenReturn('Mocked user name');

user.toString(); // returns "User name: functioncallback"
mockedUser.toString(); // returns "Mocked user name"

Verify that a method has called twice

mockedUser.toString();
mockedUser.toString();

verify(mockedUser).toString().twice();

Match a method call by argument value

upon(mockedUser).meet('foo').thenReturn('Hi foo'); // here, meet('foo') defaults to match equals('foo')

mockedUser.meet('foo'); // returns "Hi foo"
mockedUser.meet('bar'); // fails, as it doesn't match equals('foo')

Match a method call by argument type

upon(mockedUser).meet(match.any('number')).thenReturn('Hello, numberic value'); // now it will match any number

mockedUser.meet(123); // returns "Hello, numeric value"
mockedUser.meet('s'); // fails, as it's not a number

Run your specs with cappuccino

Any parameter that you provide will be passed along to jasmine-node, so you can run your specs like:

$ ./node_modules/cappuccino/bin/cappuccino --coffee --color --verbose spec

API

Primary functions

mock(object)
upon(mockedObject)
verify(mockedObject)

Built-in matchers

These functions strict a mock method to be called with arguments according to specific conditions. They are available under the match object, so you should use match.any(type) or match.a(Class) for example.

Non-matcher values default to equals(value)

any(type)
a(Class)
an(Class)
matching(regex)
containing(value)
startingWith(value)
endingWith(value)
not(matcher)
anyOf([matcher, ...])
allOf([matcher, ...])

Functions within contexts

upon(mockedObject).doesSomething()

These functions state how a mock method should behave

It defaults to return void/undefined

thenReturn(value)
thenThrow(error)
thenCall(callback)

verify(mockedObject).hasDoneSomething()

These functions verify that a mock method has been called a specific number of times

It defaults to allow the function to be called Infinity times

never()
once()
twice()
times(n)
atLeast(n)
atMost(n)
between(n1, n2)
only()

Note: only() is a bit different - it stricts a method to be the only one called from a given mock.

Running cappuccino specs

First, download source and install dependencies with npm

$ npm install

Then

$ make test

If you have watchr, you may run 'make watch' to observe changes to source files and keep tests running automatically.

Future directions

Verification in order
API to extend matchers

License

(The MIT License)

Copyright (c) 2011 Wagner Montalvao Camarao <functioncallback@gmail.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.