tag on shared_example by explicitly passing the tag name

tag_on_shared_examples_spec.rb

# fork of https://gist.github.com/3792621
# as per https://github.com/rspec/rspec-core/issues/692#issuecomment-8939172

# tag filtering does not work it_behaves_like (shared examples)
# the solution is to put the tag on the actual it block. ie use wip rather than derp tag

class Foo
  def one
  end

  def two
    one
  end
end

require 'rspec'
require 'debugger'

RSpec.configure do |config|
  config.treat_symbols_as_metadata_keys_with_true_values = true
  config.order = "random"
end

shared_examples_for "something" do |tag|
  it "should have some property", tag do
    puts "== [2] actual shared example"
    Foo.any_instance.should_receive(:one)   
    foo.two
  end
end

describe Foo do
  it_behaves_like "something", :derp do
    puts "== [1] calling shared example"
    let(:foo) { Foo.new }
  end
end