[Kde-bindings] problem with calling signals in block associated with Class.new and rspec

[Richard Dale]

On Sunday 23 November 2008 14:51:22 Stefano Crocco wrote:
> I wanted to write a method which generates a Qt::Object-derived class which
> defines signals determined at runtime. The definition of the method is the
> following:
>
> def MyModule.create *sigs
>   Class.new(Qt::Object) do
>     signals( *sigs)
>   end
> end
>
> This is called this way:
>
> MyModule.create 's1(QString)', 's2(QObject*, QPoint)'
>
> and returns a new class, derived from Qt::Object, which has the two signals
> passed as argument.
>
> When used by itself, this method works correctly, and returns a class
> which, has a 's1' and a 's2' method among its instance methods. The problem
> is that I want to test this code using RSpec. I do something like this:
>
> describe 'MyModule.create' do
>   it 'should work' do
>     cls = MyModule::Signaler.create 's1()', 's2(QString)', 's3(QObject*)'
>     cls.instance_methods.should include('s1')
>     cls.instance_methods.should include('s2')
>     cls.instance_methods.should include('s3')
>   end
> end
>
> but it doesn't work. Indeed, looking at the contents of
> cls.instance_methods, one can see that 's1', 's2' and 's3' aren't there.
> Now, I know it's very likely you won't know RSpec and its internals, but I
> was wandering if you know of some edge cases which can lead to the above
> behaviour. I tried to look at the source for the signals method in the
> qtruby4.rb file, but I couldn't find any hint on what may be failing.
It seems to work fine for me as long as I don't call create() more than once.

require 'Qt4'
require 'autotest/rspec'

module MyModule
  def MyModule.create *sigs
    Class.new(Qt::Object) do
      signals(*sigs)
    end
  end
end

describe 'MyModule.create' do
  it 'should work' do
    cls = MyModule.create 's1()', 's2(QString)', 's3(QObject*)'
    cls.instance_methods.should include('s1')
    cls.instance_methods.should include('s2')
    cls.instance_methods.should include('s3')
  end
end


app = Qt::Application.new(ARGV)
# s = MyModule.create("sig1()", "sig2()")
# p s.superclass
# p s.instance_methods.sort

If I uncomment the s = MyModule.create("sig1()", "sig2()") line, the RSpec 
test fails, otherwise it works.

-- Richard