Tests should be migrated to Rspec, or at least the testing methods should be refactored to give an Rspec interface. In many cases the syntax will likely be more natural.

Subsets

define_condition(condition) do
end

provided(condition) do
  it "should..."
end

File Testing

using_named_directory do |dir|
  it "should..." do
    task.enq(dir.input_files)
    app.run
    app.results.should_equal_expected_files_for(dir)
  end
end