Ruby Tutorials

It looks like this is going to be a three parter. For our current project we wanted to abstract some of the functionality which appeared in our models to a module. As we are taking TDD more seriously nowadays I set out to write a spec for the module first. Right. For a normal spec you need an instance of the object you are specing. But by their very nature models can not be instantiated! So how to write a spec then? Here you go:

before(:each) do
klass = Class.new { include FicklePricing }
@foo = klass.new
@foo.stub!(:id).and_return(1)
end

In this case we have created a class with does nothing but to include our module. And this almost empty class can by instantiated and used in this specs. Trivial example:

it "should respond_to price method" do
@item.should respond_to(:get_price)
end