gistfile1.rb

# Replaces `for_groups_matching`
RSpec.configure do |config|
  config.shared :type => :model do
    let(:foo) { 'only in models' }
  end
end

# I'm actually against being able to call `shared`
# on the configuration instance. It's just not needed.
# You could achieve the same by doing this:

# In support/model_configuration.rb
shared :type => :model do
  let(:foo) { 'only in models' }
end

# -------------------------------------
# Replaces `shared_examples_for`

# In support/slug_examples.rb
shared 'a model with a slug' do
  it 'sets the slug column upon initialization' do
    described_class.new.slug.should_not be_blank
  end
end

# In post_spec.rb
describe Post do
  it_should_behave_like 'a model with a slug'
end

# -------------------------------------
# Replaces `SharedContext`

# In support/user_setup.rb
shared 'basic user' do
  let(:user) { Factory(:user) }
  before { user.set_initial_password }
end

# In user_spec.rb
describe User do
  context 'that is suspended' do
    with_shared_context 'basic user'

    before { user.suspend! }

    it 'does not receive email' do
      user.receive_email?.should be_false
    end
  end
end