rspec matcher for paper_trail 1.6.5 (the latest version working with rails 2.3.x)

have_paper_trail.rb

Spec::Matchers.define :have_paper_trail do
  match do |object|
    has_class_methods?(object) && has_instance_methods?(object)
  end

  failure_message_for_should do |object|
    "Expected #{object.class} to have a has_paper_trail"
  end

  failure_message_for_should_not do |object|
    "Not expected #{object.class} to have a has_paper_trail"
  end

  description do
    "have paper_trail"
  end
end

### WARNING! this should be updated when paper_trail version is changed
def has_class_methods?(object)
  [
    :paper_trail_off,
    :paper_trail_on,
    :has_paper_trail
  ].inject(true) do |result, method|
    result && object.class.respond_to?(method)
  end
end

def has_instance_methods?(object)
  [
    :previous_version,
    :next_version,
    :version_ids,
    :version_ids=,
    :paper_trail_active,
    :paper_trail_active=,
    :autosave_associated_records_for_versions,
    :version,
    :validate_associated_records_for_versions,
    :version=,
    :versions,
    :versions=,
    :meta,
    :meta=,
    :ignore,
    :ignore=,
    :live?,
    :originator,
    :version_at
  ].inject(true) do |result, method|
    result && object.respond_to?(method)
  end
end