Adds spec for calling given block for EventMachine::HttpClient

lib/webmock/http_lib_adapters/em_http_request/em_http_request_0_x.rb

@@ -59,6 +59,7 @@ def send_request(&block)
           client.on_error("WebMock timeout error") if webmock_response.should_timeout
           client.setup(make_raw_response(webmock_response), @uri,
             webmock_response.should_timeout ? "WebMock timeout error" : nil)
+          block.call(client) unless block.nil?
           client
         elsif WebMock.net_connect_allowed?(request_signature.uri)
           http = super

spec/acceptance/em_http_request/em_http_request_spec.rb

@@ -205,6 +205,11 @@ def response(resp)
       http_request(:post, "http://www.example.com").body.bytesize.should == body.bytesize
     end
 
+    it "should yield control to given block" do
+      stub_request(:get, "www.example.com").to_return(:body => "abc")
+      expect { |b| http_request(:get, "http://www.example.com/", &b) }.to yield_control
+    end
+
     describe "mocking EM::HttpClient API" do
       let(:uri) { "http://www.example.com/" }