gem 'cuke_slicer'

$ bundle

$ gem install cuke_slicer

require 'cuke_slicer'
# Choose which part of your test suite that you want to slice up
test_directory = 'path/to/your_test_directory'
# Choose your slicing filters
filters = {excluded_tags: ['@tag1','@tag2'],
           included_tags: '@tag3',
           excluded_paths: 'foo',
           included_paths: [/test_directory/]}
# Use the slicer to find all tests matching those filters
found_tests = CukeSlicer::Slicer.new.slice(test_directory, filters, :file_line)
# Arrange the sliced pieces to suit your particular needs. In this case, we will dump them
# into a file that Cucumber can consume.
File.open('tests_to_run.txt', 'w') { |file| file.puts found_tests }
system('cucumber @tests_to_run.txt')

CukeSlicer::Slicer.new.slice(test_directory, {}, :file_line) do |test_case|
  test_case.is_a?(CukeModeler::Scenario) &&
  test_case.get_ancestor(:feature).name =~ /first/
end