Fix manticore streaming mode when WebMock is enabled

lib/webmock/http_lib_adapters/manticore_adapter.rb

@@ -127,8 +127,15 @@ def generate_manticore_response(webmock_response)
           def generate_webmock_response(manticore_response)
             webmock_response = WebMock::Response.new
             webmock_response.status = [manticore_response.code, manticore_response.message]
-            webmock_response.body = manticore_response.body
             webmock_response.headers = manticore_response.headers
+
+            # The attempt to read the body could fail if manticore is used in a streaming mode
+            webmock_response.body = begin
+              manticore_response.body
+            rescue ::Manticore::StreamClosedException
+              nil
+            end
+
             webmock_response
           end
         end

spec/acceptance/manticore/manticore_spec.rb

@@ -70,6 +70,38 @@
           expect(failure_handler).to have_received(:call)
         end
       end
+
+      context 'when used in a streaming mode' do
+        let(:webmock_server_url) {"http://#{WebMockServer.instance.host_with_port}/"}
+        let(:result_chunks) { [] }
+
+        def manticore_streaming_get
+          Manticore.get(webmock_server_url).tap do |req|
+            req.on_success do |response|
+              response.body do |chunk|
+                result_chunks << chunk
+              end
+            end
+          end
+        end
+
+        context 'when connections are allowed' do
+          it 'works' do
+            WebMock.allow_net_connect!
+            expect { manticore_streaming_get.call }.to_not raise_error
+            expect(result_chunks).to_not be_empty
+          end
+        end
+
+        context 'when stubbed' do
+          it 'works' do
+            stub_body = 'hello!'
+            stub_request(:get, webmock_server_url).to_return(body: stub_body)
+            expect { manticore_streaming_get.call }.to_not raise_error
+            expect(result_chunks).to eq [stub_body]
+          end
+        end
+      end
     end
   end
 end