[rspec-users] Using RSpec to test Rake tests

David Chelimsky dchelimsky at gmail.com
Tue Apr 27 07:18:48 EDT 2010


On Apr 26, 2010, at 4:29 PM, John Feminella wrote:

> hi guys,
> 
> I'm trying to be diligent about checking my `rake` tasks with RSpec
> tests, but in the process of feeling my way around I seem to have hit
> a wall. I've got a really simple RSpec test that looks like this:
> 
>    # ./test/meta_spec.rb
>    describe "Rake tasks" do
>      require 'rake'
> 
>      before(:each) do
>        @rake = Rake::Application.new
>        @rake.load_rakefile  # => Error here!
>        Rake.application = @rake
>      end
> 
>      after(:each) do
>        Rake.application = nil
>      end
> 
>      it "should have at least one RSpec test to execute" do
>        Rake.application["specs"].spec_files.size.should > 0
>      end
>    end
> 
> I have a simple task called "specs" defined in `./Rakefile.rb` which
> has a Spec::Rake::SpecTask that includes all the `*_spec.rb` files.

This is what the default spec task does, and it is well specified in rspec's own specs. There is a general rule of thumb that says "test your code, not everybody else's." This suggests that you don't really need to be testing this. Any reason you feel the need to?

David

> If I put the `@rake.load_rakefile` method in (which is my
> understanding of what the Rake docs tell you to do when
> programmatically instantiating Rake::Application instances), I want
> that Rakefile to load. But instead it just bombs out. If I comment it
> out, however, the test fails because the "specs" task is
> (understandably) not defined.
> 
> Where am I going wrong? (I suspect this might be more of a Rake
> question than a RSpec one, but I've posted on this list just in case
> my assessment is off.) Or is the goal of testing Rake tasks better
> served by something other than RSpec?
> 
> Any help is appreciated. Thanks very much!
> 
> ~ jf
> --
> John Feminella
> Principal Consultant, Distilled Brilliance
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