output matcher expected block but was not a block

Question

here is a snippet from my spec:

context "Given array [1,2,3] and block {|e| puts e if e == 1}" do

subject { Array.new([1,2,3]) }

it "prints out 1 and returns [1,2,3]" do
  expect(subject.my_each { |e| puts e if e == 1 }).to output("1\n").to_stdout
  expect(subject.my_each { |e| puts e if e == 1 }).to eql([1,2,3])
end

end

here is the Rspec output:

1) .my_each Given array [1,2,3] and block {|e| puts e if e == 1} prints out 1 and returns [1,2,3] Failure/Error: expect(subject.my_each { |e| puts e if e == 1 }).to output("1\n").to_stdout

   expected block to output "1\n" to stdout, but was not a block
   Diff:
   @@ -1,2 +1 @@
   -1

 # ./spec/enumerable_spec.rb:30:in `block (3 levels) in <top (required)>'

Answer 1

Based on this, I changed my expect to this: expect { subject.my_each { |e| puts e if e == 1 } }.to output("1\n").to_stdout