Benchmarking rspec matchers "match" and "include"

test_match_spec.rb

require 'rails_helper'
require 'benchmark'

RSpec.describe 'testing match vs includes' do

  let(:subject) { "This is the time for all good men to come to the aid of their country" }
  HOW_MANY_TIMES = 100_000

  Benchmark.bm(10) do |bm|
    bm.report("match:") do
      HOW_MANY_TIMES.times do |x|
        it { is_expected.to match "good" }
      end
    end
    bm.report("include:") do
      HOW_MANY_TIMES.times do |x|
        it { is_expected.to include "good" }
      end
    end
  end
end

The output:

$ be rspec spec/test_match_spec.rb
Running via Spring preloader in process 63180
Applying workarounds
                 user     system      total        real
match:      10.060000   1.540000  11.600000 ( 11.694110)
include:     9.120000   1.440000  10.560000 ( 10.620734)