matchy¶ ↑

• github.com/jeremymcanally/matchy

Hate writing assertions? Need a little behavior-driven love in your tests? Then matchy is for you.

• Get the beauty of RSpec without all the overhead

• Create your own matchers with ease and def_matcher()

• Get BDD on your objects

  x = 13 * 4
  x.should == 42
  
  y = "hello"
  y.length.should_not be(4)
  

• Use familiar syntax to specify things

  # RSpec
  "my string".should =~ /string/
  lambda { raise "FAIL" }.should raise_error
  
  # matchy
  "my string".should =~ /string/
  lambda { raise "FAIL" }.should raise_error
  

• Most of familiar RSpec Matchers are built in

  # raise_error matcher
  lambda {raise}.should raise_error                                  #pass
  lambda {raise MyCustomError.new}.should raise_error(MyCustomError) #pass
  lambda {raise "message"}.should raise_error("message")             #pass
  lambda {raise "message"}.should raise_error(/essa/)                #pass
  
  # change matcher
  lambda {@var+=1}.should change {@var}
  # passes
  lambda { }.should change {@var}
  # fails
  @var = 1
  lambda {@var+=1}.should change {@var}.from(1).to(2)
  # passes
  
  # be_something matcher
  @obj.should be_something
  # passes if @obj.something? is true
  
  * a lot more ...

• Get the speed of Test:Unit with the syntax of RSpec

• Create your own matchers

  # nil_matcher (As a simple and quick example)
  def_matcher :be_nil do |receiver, matcher, args|
    receiver.nil?
  end
  
  nil.should be_nil            # pass
  nil.should_not be_nil        # fails
  'notnil'.should be_nil       # fails
  'notnil'.should_not be_nil   # pass
  
  # have(n).somethings matcher (A little bit more complex)
  def_matcher :have do |receiver, matcher, args|

count = args something = matcher.msgs.name actual = receiver.send(something).length matcher.positive_msg = “Expected #{receiver} to have #{actual} #{something}, but found #{count} ” actual == count end class Thing def widgets @widgets ||= [] end end @thing.should have(3).widgets

• Test::Unit (you got it)

$ gem sources -a http://gems.github.com
$ sudo gem install mhennemeyer-matchy

(The MIT License)

Copyright © 2008 Jeremy McAnally

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.