Pass a ruby &block using rspec

Question

I want to test the functionality of the method using rspec that receives anonymous block and not raise error. Below is my code:

class SP
  def speak(options={},&block)
    puts "speak called" 
    block.call()
  rescue StandardError => e
    puts e.inspect()
  end  
end


describe SP do
  it "testing speak functionality not to raise error" do
    sp = SP.new
    sp_mock = double(sp)
    expect(sp_mock).to receive(:speak).with(sp.speak{raise StandardError}).not_to raise_error
  end  
end

It is below throwing error

SP testing speak functionality not to raise error

 Failure/Error: expect(sp).to receive(:speak).with(sp.speak{raise StandardError})

   (#<SP:0x007fead2081d20>).speak(nil)
       expected: 1 time with arguments: (nil)
       received: 0 times
 # ./test.rb:22:in `block (2 levels) in <top (required)>'

Spent a lot of time browsing articles of ruby blocks and ruby documentation but can't figure out.

You don't need to put "EDITED" in your posts. This is not reddit. We can see full history of post edits. — Sergio Tulentsev, Jun 16 '17 at 17:36
Your expectation is for sp_mock to be called with with speak, but you are not calling sp_mock.speak in your test. — Yoav Epstein, Jun 18 '17 at 05:51

score 2 · Accepted Answer · answered Jun 16 '17 at 17:30

2

It's too complicated for no reason. Did you mean this?

it "testing speak functionality not to raise error" do
  sp = SP.new
  expect {
    sp.speak {raise StandardError}
  }.to_not raise_error
end

answered Jun 16 '17 at 17:30

Sergio Tulentsev

226,338
43
373
367

yes i can do it like this but my motive is to pass a block to a function using rspec – ojas Jun 16 '17 at 17:36
@OJASJUNEJA: what would you hope to accomplish with that? – Sergio Tulentsev Jun 16 '17 at 17:37
1

@OJASJUNEJA you can't pass anything with rspec. The `expect to receive` construct only sets an expectation. And you can get/call a block that was passed to you. But the actual invocation must be done by "regular ruby". – Sergio Tulentsev Jun 16 '17 at 17:40
Actually it is just a demo of my real work. I cant post it here. I have function which takes &block as parameter and call that block in its definition. I know how to write rspec test case. I am just not able to pass a block to a function using rspec – ojas Jun 16 '17 at 17:40
but we have rspec receive(:method).with()... source:https://relishapp.com/rspec/rspec-mocks/v/3-2/docs/setting-constraints/matching-arguments – ojas Jun 16 '17 at 17:45
@OJASJUNEJA: Yes, and that is not calling/passing anything. – Sergio Tulentsev Jun 16 '17 at 17:57

Pass a ruby &block using rspec

1 Answers1