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Setup bootsnap to speedup TestRunnerTest

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When running `rails t` we skip the "fork" optimization. Because
of this Rails is loaded from scratch.

However the vast majority of the code is Rails and other gems
so it's the same for all tests.

By seting up bootsnap we can dramatically speed it up.

main:
```
$ bin/test test/application/test_runner_test.rb -n test_run_single_file
Run options: -n test_run_single_file --seed 8478

.

Finished in 7.313216s, 0.1367 runs/s, 0.2735 assertions/s.
```

This branch:
```
$ bin/test test/application/test_runner_test.rb -n test_run_single_file
Run options: -n test_run_single_file --seed 60063

.

Finished in 2.751576s, 0.3634 runs/s, 0.7269 assertions/s.
1 runs, 2 assertions, 0 failures, 0 errors, 0 skips
```
This commit is contained in:
Jean Boussier 2021-10-28 10:00:35 +02:00
parent a93a8f1a56
commit 05887d31f1
1 changed files with 11 additions and 1 deletions
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12
railties/test/isolation/abstract_unit.rb
View file

@ -38,6 +38,10 @@ module TestHelpers
File.join RAILS_FRAMEWORK_ROOT, "tmp/templates/app_template"
end
def bootsnap_cache_path
File.join RAILS_FRAMEWORK_ROOT, "tmp/templates/bootsnap"
end
def tmp_path(*args)
@tmp_path ||= File.realpath(Dir.mktmpdir(nil, File.join(RAILS_FRAMEWORK_ROOT, "tmp")))
File.join(@tmp_path, *args)
@ -368,7 +372,12 @@ module TestHelpers
Process.waitpid pid
else
output = `cd #{app_path}; #{command}`
ENV["BOOTSNAP_CACHE_DIR"] = bootsnap_cache_path
begin
output = `cd #{app_path}; #{command}`
ensure
ENV.delete("BOOTSNAP_CACHE_DIR")
end
end
raise "rails command failed (#{$?.exitstatus}): #{command}\n#{output}" unless allow_failure || $?.success?
@ -513,6 +522,7 @@ Module.new do
sh "#{Gem.ruby} #{RAILS_FRAMEWORK_ROOT}/railties/exe/rails new #{app_template_path} --skip-bundle --no-rc --quiet"
File.open("#{app_template_path}/config/boot.rb", "w") do |f|
f.puts 'require "bootsnap/setup" if ENV["BOOTSNAP_CACHE_DIR"]'
f.puts 'require "rails/all"'
end