0.3.0

Features

• Added warmup functionality.

The warmup block is invoked once before the experiments. It aims to solve the caching-like problems, e.g. when your memoize something in your controller instance or use other caching techniques.

Without warming up the fist run might show more queries than the following runs.

RSpec usage:

context "N + 1", :n_plus_one do
  populate { |n| create_list :post, n }
  
  # cache something that must be cached
  warmup { get :index }
  
  specify do
    expect { get :index }.to perform_constant_number_of_queries
  end
end

Minitest usage:

def populate(n)
  create_list(:post, n)
end

def warmup
  get :index
end

def test_no_n_plus_one_error
  assert_perform_constant_number_of_queries do
    get :index
  end
end

# or with params

def test_no_n_plus_one
  populate = ->(n) { create_list(:post, n) }
  warmup = -> { get :index }
  
  assert_perform_constant_number_of_queries population: populate, warmup: warmup do
    get :index
  end
end