This is odd that it's indented so far over.  Compare to how it was in rspec-expectations:

https://github.com/rspec/rspec-expectations/blob/9003d2d7ef0c124f06f135a436d84c031947a608/spec/rspec/expectations/diff_presenter_spec.rb#L219-L225

Maybe it was a copy/paste error?  Can you remove the extra indentation?