Skip to content

Instantly share code, notes, and snippets.

Last active Aug 29, 2015
What would you like to do?
Minitest loads *slower* than RSpec?
require "benchmark/ips"
File.write "minitest_test.rb", <<-EOS
require "minitest/autorun"
require "minitest/pride"
class MintestTest < Minitest::Test
def test_foo
assert true
File.write "rspec_spec.rb", <<-EOS
require "rspec/autorun"
RSpec.describe "RSpec" do
it "foo" do
expect(true).to eq true
Benchmark.ips do |x|
x.config(time: 10)"rspec") { `ruby rspec_spec.rb` }"minitest") { `ruby minitest_test.rb` }!
# Calculating -------------------------------------
# rspec 1.000 i/100ms
# minitest 1.000 i/100ms
# -------------------------------------------------
# rspec 4.545 (± 0.0%) i/s - 46.000
# minitest 3.951 (± 0.0%) i/s - 40.000
# Comparison:
# rspec: 4.5 i/s
# minitest: 4.0 i/s - 1.15x slower
Copy link

runlevel5 commented Apr 9, 2015

I think you should remove pride and run the bm again

Copy link

janko commented Apr 9, 2015

I did, and then Minitest was 1.14x slower. I just required it to match RSpec's functionality more closely.

But I think there's something wrong with my Mac, because when @zenspider ran the same benchmarks, RSpec turned out to be 1.74x slower to load than Minitest. Maybe you can try running them.

Copy link

berislavbabic commented Apr 9, 2015

@janko-m on my 2014 MBP
This is the original script, with pride

☺  ruby spec_bench.rb                                                                                                                                                          2.2.1
Calculating -------------------------------------
               rspec     1.000  i/100ms
            minitest     1.000  i/100ms
               rspec      4.170  (± 0.0%) i/s -     42.000
            minitest      2.613  (± 0.0%) i/s -     27.000

               rspec:        4.2 i/s
            minitest:        2.6 i/s - 1.60x slower

Copy link

janko commented Apr 9, 2015

Thanks for chipping in. It seems like from 5 testers only @zenspider's computer is producing reverse results.

Copy link

mislav commented Apr 10, 2015

In my fork I've rewritten your benchmark:

Turns out there isn't much of a difference. Startup times of these test libraries don't matter anyway; so based on just that it's not really fair to say "X is faster than Y".

Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment