}
          }
        };
    try {
      funnel.funnel(null, primitiveSink);
      fail();
    } catch (NullPointerException ok) {
    }
  }

  public void testAsOutputStream() throws Exception {
    PrimitiveSink sink = mock(PrimitiveSink.class);
    OutputStream out = Funnels.asOutputStream(sink);
    byte[] bytes = {1, 2, 3, 4};
    out.write(255);
    out.write(bytes);