aaplication_spec.rb

require 'application'
require 'capybara/dsl'
require 'minitest/autorun'

Capybara.app = Sinatra::Application
set :environment, 'test'

describe 'main application' do
  include Capybara::DSL

  describe 'GET /' do
    it "must be succcessful" do
      visit '/'
      page.body.must_match /Hello World/
    end
  end
end

application.rb

require 'sinatra'

get "/" do
  "Hello World"
end

exec_spec.sh

#=================================================================
# using rbi 2.0.0 head with JIT
$ time rbi -X19 -I. -Ispec spec/store_spec.rb
Finished tests in 1.173194s, 0.8524 tests/s, 1.7047 assertions/s.
6.33s user 0.12s system 130% cpu 4.957 total

Finished tests in 1.184263s, 0.8444 tests/s, 1.6888 assertions/s.
6.31s user 0.12s system 130% cpu 4.923 total

Finished tests in 1.168855s, 0.8555 tests/s, 1.7111 assertions/s.
6.33s user 0.12s system 130% cpu 4.957 total
#=================================================================
# using rbi 2.0.0 head without JIT
$ time rbi -X19 -Xint -I. -Ispec spec/store_spec.rb
Finished tests in 1.427137s, 0.7007 tests/s, 1.4014 assertions/s.
4.48s user 0.09s system 99% cpu 4.584 total

Finished tests in 1.424297s, 0.7021 tests/s, 1.4042 assertions/s.
4.44s user 0.09s system 99% cpu 4.543 total

Finished tests in 1.417113s, 0.7057 tests/s, 1.4113 assertions/s.
4.43s user 0.09s system 99% cpu 4.531 total
#=================================================================
# using 1.9.3-p0
$ time ruby -I. -Ispec spec/store_spec.rb
Finished tests in 0.254037s, 3.9364 tests/s, 7.8729 assertions/s.
0.74s user 0.07s system 99% cpu 0.812 total

Finished tests in 0.230056s, 4.3468 tests/s, 8.6935 assertions/s.
0.72s user 0.07s system 99% cpu 0.790 total

Finished tests in 0.238203s, 4.1981 tests/s, 8.3962 assertions/s.
0.72s user 0.07s system 99% cpu 0.793 total