attr_accessor_matchers.rb

RSpec::Matchers.define :have_attr_accessor do |attribute|
  match do |object|
    object.respond_to?(attribute) && object.respond_to?("#{attribute}=")
  end

  description do
    "have attr_writer :#{attribute}"
  end
end

RSpec::Matchers.define :have_attr_reader do |attribute|
  match do |object|
    object.respond_to? attribute
  end

  description do
    "have attr_reader :#{attribute}"
  end
end

RSpec::Matchers.define :have_attr_writer do |attribute|
  match do |object|
    object.respond_to? "#{attribute}="
  end

  description do
    "have attr_writer :#{attribute}"
  end
end

class Foo
  attr_accessor :bar
end

describe Foo do
  it { Foo.new.should have_attr_accessor :bar }
end