support Faraday persistent connection closing

lib/vcr/middleware/faraday.rb

@@ -31,6 +31,11 @@ def call(env)
         RequestHandler.new(@app, env).handle
       end
 
+      # Close any persistent connections.
+      def close
+        @app.close if @app.respond_to?(:close)
+      end
+
       # @private
       class RequestHandler < ::VCR::RequestHandler
         attr_reader :app, :env

spec/lib/vcr/middleware/faraday_spec.rb

@@ -181,4 +181,25 @@ def make_request(disabled = false)
       end
     end
   end if defined?(::Typhoeus)
+
+  describe '#close' do
+    let(:faraday_app) { double }
+
+    def close
+      described_class.new(faraday_app).close
+    end
+
+    context 'when adapter supports persistent connections' do
+      it 'calls adapter close method' do
+        expect(faraday_app).to receive(:close)
+        close
+      end
+    end
+
+    context 'when adapter does not support persistent connections' do
+      it 'does not raise error' do
+        expect { close }.not_to raise_error
+      end
+    end
+  end
 end