waiting async processing helper for Capybara 2.5.0

usage.rb

scenario 'User likes the post' do
  visit post_path
  click_button 'Like'
  
  expect { page.has_css?('.liked-icon') }.to become_true
end

wait_steps.rb

require 'timeout'

# Wating async processing helper.
#
# Examples
#
#   expect { page.has_css?('...') }.to become_true
#
module WaitSteps
  extend RSpec::Matchers::DSL

  matcher :become_true do
    match do |block|
      begin
        Timeout.timeout(Capybara.default_max_wait_time) do
          value = nil
          loop do
            value = block.call
            break if value
            sleep(0.1)
          end
          value
        end
      rescue TimeoutError
        false
      end
    end

    def supports_block_expectations?
      true
    end
  end
end