expectRangeRequest(uri, startByte, endByte, isInit) {
    shaka.test.FakeNetworkingEngine.expectRangeRequest(
        this.request, uri, startByte, endByte, isInit);
  }
Expects that a range request for the given segment has occurred.

@param {string} uri
@param {number} startByte
@param {?number} endByte
@param {boolean} isInit