Add StackProf to the Gemfile, along with a utility to get a profile for a spec

bin/rspec-stackprof

@@ -0,0 +1,16 @@
+#!/usr/bin/env ruby
+
+require 'stackprof'
+$:.unshift 'spec'
+require 'rails_helper'
+
+filename = ARGV[0].split('/').last
+interval = ENV.fetch('INTERVAL', 1000).to_i
+limit = ENV.fetch('LIMIT', 20)
+output_file = "tmp/#{filename}.dump"
+
+StackProf.run(mode: :wall, out: output_file, interval: interval) do
+  RSpec::Core::Runner.run(ARGV, $stderr, $stdout)
+end
+
+system("stackprof #{output_file} --text --limit #{limit}")