As Jon pointed out, the rspec-mocks API allows you to use blocks to specify
implementation logic and/or return values so I don’t think that making it
also match on the block will work well. The solution you came up with looks
OK to me. You could shorten it further with a helper method:
module ReceiveWithBlock
def receive_with_block(method_name, &expected_block)
receive(method_name) { |&block| expect(block).to eq expected_block }
endend
RSpec.configure do |config|
config.include ReceiveWithBlockend
Which you could then use with:
expect(Foo).to receive_with_block(:baz, &my_block)
Given the rarity of this need and that there are solutions, I would lean
against adding anything additional to the RSpec API for it.
Myron
On Thu, Feb 18, 2016 at 3:13 PM, Jon Rowe <[email protected]> wrote:
> The problem with block arguments is there priority with Ruby… Consider
> that this:
>
> it “returns my value" do
> expect(Foo).to receive(:baz) { “my return value” }
> end
>
> Needs to return the same as this:
>
> it “still returns my value" do
> expect(Foo).to receive(:baz).with(:my_argument) { “my return value” }
> end
>
> And that is the same as this:
>
> it “still returns my value” do
> my_block = lambda { “my return value” }
> expect(Foo).to receive(:baz).with(:my_argument,&my_block)
> end
>
> And hopefully you can see why it doesn’t (and intend can’t) work the way
> you want it currently…
>
> I’d be open to adding another way to match this however, maybe an argument
> matcher?
>
> it "passes the given block to Foo" do
> my_block = lambda {}
>
> # pseudo code, won’t work atm
> expect(Foo).to receive(:baz).with(block_argument(my_block))
>
> Bar.baz_wrapper(&my_block)
> end
>
> Jon Rowe
> ---------------------------
> [email protected]
> jonrowe.co.uk
>
> On Friday, 19 February 2016 at 09:47, Nathan Wenneker wrote:
>
> I want to verify that this method passes a block to a collaborator:
>
>
> module Bar
> def self.baz_wrapper(&block)
> Foo.baz(&block)
> end
> end
>
> Something like this would be nice:
>
> it "passes the given block to Foo" do
> my_block = lambda {}
>
> expect(Foo).to receive(:baz).with(&my_block)
>
> Bar.baz_wrapper(&my_block)
> end
>
> However, the best I could come up with is this:
>
>
> it "passes the given block to Foo" do
> my_block = lambda {}
>
> expect(Foo).to receive(:baz) do |&block|
> expect(block).to eq(my_block)
> end
>
> Bar.baz_wrapper(&my_block)
> end
>
> Questions.
>
> 1. Is there a better way to do this?
>
> 2. If not, would you be open to a discussion on making `expect(Foo).to
> receive(:baz).with(&my_block)` work?
>
>
> Thank you,
>
> Nathan
>
>
>
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