Adding ‘given a’ to rspec
Tuesday, February 16th, 2010Over the past few months I have grown to like the ‘given a’ syntax more and more (described here). So when I recently reactivated my Ruby On rails home project (see brikeyard deployed on heroku), I thought I would add that syntax to my rspec examples rather than use before(:each).
I have not spent too much time thinking about where to put this code. Nor did I spend much time peeling away the nested modules inside rspec. Ideas to make this better are very welcomed. I would also love to collect some feedback on this before I make a fool of myself by proposing its inclusion in rspec proper. Thanks in advance for your help !
Here is how the setup looks like in one of the specs:
describe :something do
given {
a StatisticalControl
a WorkItem, {:lead_time => 1}
another WorkItem, {:lead_time => 3}
a ProcessStage, {:work_in_process => [a_work_item, another_work_item]}
a ControlChart
@project = Project.new
@project.stub!(:lead_time_control).and_return(a_statistical_control)
@project.stub!(:closed_stage).and_return(a_process_stage)
}
it "should do something useful" do
(...)
end
end
And here is what I added to my spec_helper.rb file:
def a(type, stubs ={})
stub = mock_model(type, stubs)
member_name = type.name.gsub(/[A-Z]/) {|match|
"_#{match.downcase}"
}
instance_eval("
@a#{member_name} = stub
def a#{member_name}
return @a#{member_name}
end
")
end
def another(type, stubs ={})
stub = mock_model(type, stubs)
member_name = type.name.gsub(/[A-Z]/) {|match|
"_#{match.downcase}"
}
instance_eval("
@another#{member_name} = stub
def another#{member_name}
return @another#{member_name}
end
")
end
class Spec::Rails::Example::FunctionalExampleGroup
class << self
def given &block
before(:each, &block)
end
end
end
class Spec::Rails::Example::ModelExampleGroup
class << self
def given &block
before(:each, &block)
end
end
end
Please let me know what you think. I welcome suggestions to improve.
