code: @Test public void doublePushPromise() throws Exception {
    peer.setVariantAndClient(HTTP_20_DRAFT_09,false);
    peer.sendFrame().pushPromise(1,2,headerEntries("a","android"));
    peer.acceptFrame();
    peer.sendFrame().pushPromise(1,2,headerEntries("b","banana"));
    peer.acceptFrame();
    peer.play();
    SpdyConnection connection=connectionBuilder(peer,HTTP_20_DRAFT_09).build();
    connection.newStream(headerEntries("b","banana"),false,true);
    assertEquals(TYPE_HEADERS,peer.takeFrame().type);
    assertEquals(PROTOCOL_ERROR,peer.takeFrame().errorCode);
  }
  