用于单个测试的 Rails/RSpec 切换缓存

Question

所以在我的应用程序中，我可以禁用所有测试的缓存，这将是理想的，但显然有许多遗留测试依赖于缓存的功能。有没有办法为单个 RSpec 测试启用 Rails 缓存？

类似：

before(:each) do
  @cache_setting = Rails.cache.null_cache
  Rails.cache.null_cache = true
end

after(:each) do
  Rails.cache.null_cache = @cache_setting
end

it 'does not hit the cache' do
  ...
end

Answer 1

在spec_helper.rb

RSpec.configure do |config|
  config.before(:example, disable_cache: true) do
    allow(Rails).to receive(:cache).and_return(ActiveSupport::Cache::NullStore.new)
  end

  config.after(:example, disable_cache: true) do
    allow(Rails).to receive(:cache).and_call_original
  end
end

在xxx_spec.rb

RSpec.describe "a group without matching metadata" do
  it "does not run the hook" do
     puts Rails.cache.class
  end

  it "runs the hook for a single example with matching metadata", disable_cache: true do
     puts Rails.cache.class
  end
end

https://www.relishapp.com/rspec/rspec-core/docs/hooks/filters