如何测试 Rspec 中的简单块参数？

Question

I am trying to write an expectation for this snippet of code:

Sidekiq::Queue.all.each(&:clear)

I know the shorthand generates a block and so far I have tried the satisfy matcher, and this is the current version I am working with. I know this syntax is incorrect, and I will keep updating what I try:

expect(Sidekiq::Queue).to receive_message_chain(:all, :each) { &:clear }.and_return(true)

Answer 1

This is the approach I used to solve this but I am open to other ideas on HOW not WHY as testing blocks can be tough, and I think this would be a great example.

expect(Sidekiq::Queue).to receive_message_chain(:all, :each) do |&block|
  expect(block).to be(Proc.new(&:clear))
end

Credit where credit is due: https://github.com/rspec/rspec-mocks/issues/1182