import { assert } from "chai" ; import * as sinon from "sinon" ; import { Duplex } from "stream" ; import { ExpandedDuplexTransportConfiguration } from "../../config/expanded" ; import { DuplexTransport } from "./duplex-transport" ; describe ( "./client/transport/duplex-transport" , function ( ) { describe ( "DuplexTransport" , function ( ) { it ( "should call the stream-getter function from the config once" , function ( ) { const stream = new Duplex ( ) ; const streamGetter = sinon . fake . returns ( stream ) ; const config = { type : "duplex" , stream : streamGetter , preSetup : false , } ; const transport = new DuplexTransport ( config ) ; assert . strictEqual ( streamGetter . callCount , 1 ) ; assert . strictEqual ( transport . stream , stream ) ; } ) ; } ) ; } ) ;