Small benchmark for closure tree specs

closure_tree_benchmark

require 'benchmark'

TEST_COUNT = 20

overall_seconds = 0
tm_outer = Benchmark.measure do
  TEST_COUNT.times do |n|
    puts "Test run #{n+1}"
    tm_inner = Benchmark.measure do
      `rake spec all`
    end
    printf("%.2f seconds\n", tm_inner.real)
    overall_seconds += tm_inner.real
  end
end

puts '=== Result:'
puts tm_outer.inspect
printf("%.2f seconds\n", tm_outer.real)
puts '=== Average:'
printf("%.2f seconds\n", overall_seconds / TEST_COUNT)