[ Test ] Efficiently Speed Rspec test

Ref

5 tips to speed up testing using RSpec and Ruby on Rails

Conclusion

前面 1 ~ 4 点，学习一些技巧和写法，但是效能没特提到

但第 5 点 Efficiently load data records 得到几个方向

1. Use let, rather than let!
2. One is to use before_all instead of before_each in a test file
3. Another is to have a global variables file, which loads an instance of each record before all tests start
4. Another approach is to user FactoryBot’s build_stubbed method

Ref

Jasmine: Understanding the Difference between beforeAll and beforeEach

https://stackoverflow.com/questions/16617052/rails-rspec-before-all-vs-before-each

Conclusion

Always write this for my test

before(:each) do
   ....
end

Maybe can use this to do only 1 query or 1 times insert to DB

before(:all) do
    .....
end

REF

from ruby conf

Speeding Up Your Test Suite - RedDotRubyConf 2016 - Engineers.SG

Conclusion

Absolutely point to 5 steps to save time
7 examples from 22 sec down to 3 sec

Can use Zeus or Spring to save time.
Yesterday which I read also mention this:

http://www.betterspecs.org/zh_tw/#spork

5 steps to follow:

Measure test performance often and efficiently (now only 15 sec)

use Zeus | Spring, Rspec profile

Avoid forceful database clean after each test (now only 7 sec, compare before save 47%)

bad:

config.before(:each) do
    DatabaseCleaner.start
end
config.after(:each) do
    DatabaseCleaner.clean
end

good:

config.before(:all) do
    DatabaseCleaner.start
end
config.after(:all) do
    DatabaseCleaner.clean
end

Declare and reuse associations (now only 5 sec, compare before save 40%)

before(:all) do
  @user = FactoryGirl.create(:user)
end

Reuse in object declaration

before(:each) do
  @order_fulfillment = FactoryGirl.create(
    :order_fulfillment,
    user: @user,
    order: @order,
    shoper:@user
end

Use build stubbed, until you can’t (now only 4.8 sec, compare before save 4%)

FactoryGirl’s build strategied
1. create
2. build
3. build stubbed

before(:each) do
  @order_fulfillment = FactoryGirl.build_stubbed(
    :order_fulfillment,
    user: @user,
    order: @order,
    shoper:@user
end

Use mocks and stubs to imitate slow operations (now only 3 sec, compare before save 38%)

before do
    allow(FeatureToggles::GeeTest).
      to receive(:disabled?).
      and_return(false)
    allow_any_instance_of(Captcha::GeeTest).
      to receive(:validate!).
      and_raise(Captcha::GeeTest::Error.new("Captcha Validation Failed"))
end

我部落格搬家囉！以後會在這發文：

https://blog.gmifly.tw/