When /^I run Jekyll$/ do
  run_jekyll
end

Given /^I have a responsive_image configuration with:$/ do |config|
  write_file('_config.yml', "responsive_image:\n#{config}")
end

Given /^I have a file "([^\"]+)" with:$/ do |path, contents|
  write_file(path, contents)
end

Then /^I should see "(.*)" in "(.*)"$/ do |text, file|
  assert_match(Regexp.new(text), File.open(file).readlines.join)
end

def write_file(path, contents)
  File.open(path, 'w') do |f|
    f.write(contents)
    f.close
  end
end