return total bytes sent when resetting a stream in the flow controller

flowcontrol/flow_controller_test.go

@@ -108,6 +108,11 @@ var _ = Describe("Flow controller", func() {
 			Expect(controller.bytesSent).To(Equal(protocol.ByteCount(5 + 6)))
 		})
 
+		It("gets the bytesSent", func() {
+			controller.bytesSent = 8
+			Expect(controller.GetBytesSent()).To(Equal(protocol.ByteCount(8)))
+		})
+
 		It("gets the size of the remaining flow control window", func() {
 			controller.bytesSent = 5
 			controller.sendFlowControlWindow = 12