Posted By: Jim Weirich
Date: 2007-04-14 23:28
Summary: FlexMock 0.5.1
Project: Electric Calendar

= FlexMock 0.5.0 Released

FlexMock is a flexible mocking library for use in Ruby's Test::Unit
test framework. Version 0.5.1 is a minor bug fix release.

== New in 0.5.1

* Version 0.5.1 fixes a problem that caused some older versions of
RCov to core dump.

== What is FlexMock?

FlexMock is a flexible Ruby mocking library that works with Ruby's
Test::Unit framework to create easy to use mocks.

=== Features

* Easy integration with Test::Unit. Mocks created with the flexmock
method are automatically verified at the end of the test.

* A fluent interface that allows mock behavior to be specified very

* A "record mode" where an existing implementation can record its
interaction with a mock for later validation against a new

* Easy mocking of individual methods in existing, non-mock objects.

=== Example

Suppose you had a Dog object that wagged a tail when it was happy.
Something like this:

class Dog
def initialize(a_tail)
@tail = a_tail
def happy

To test the +Dog+ class without a real +Tail+ object (perhaps because
real +Tail+ objects activate servos in some robotic equipment), you
can do something like this:

require 'test/unit'
require 'flexmock'

class TestDog < Test::Unit::TestCase
include FlexMock::TestCase

def test_dog_wags_tail_when_happy
tail = flexmock("tail")
dog =

FlexMock will automatically verify that the mocked tail object
received the message +wag+ exactly one time. If it doesn't, the test
will not pass.

See the FlexMock documentation at for details on specifying
arguments and return values on mocked methods, as well as a simple
technique for mocking tail objects when the Dog class creates the tail
objects directly.

== Availability

You can make sure you have the latest version with a quick RubyGems command:

gem install flexmock (you may need root/admin privileges)

Otherwise, you can get it from the more traditional places:


You will find documentation at:

-- Jim Weirich

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