add support for yielding HTTP::Client method types

[repomaa]

i.e.

WebMock.stub(:get, "http://www.foo.bar").to_return(body_io: IO::Memory.new("foobar"))

HTTP::Client.get("http://www.foo.bar") do |response|
  File.open("dump", "w+") do |file|
    IO.copy(response.body_io, file)
  end
end

[wezm]

This PR would be useful for a project I'm working on. Anything needed (aside from perhaps resolving conflicts) to get it over the line?

[bcardiff]

@repomaa there are a couple of conflicts preventing this to be merged.

I also found confusing the description of the PR w.r.t. the specs added. All the example are about been able to set the response io, and that does not require the user of webmock to use yields or blocks. Am I overlooking something?

[repomaa]

@bcardiff you might be right about the confusion regarding the specs. The thing is that you can only access body_io on the yielding variant of HTTP::Client#get.

[bcardiff]

When possible I find it clearer to express things from the perspective for the user "Allow stubbing body IO (aka: file payloads)" rather than the implementation "Add X/Y overload".

Thanks for updating the PR @repomaa !

[wezm]

Great, thank you both for getting this over the line.

[msa7]

I have an issue #41 after these changes. Any suggestions how to fix?