steppingDispatcher.registerChannel(blockingChannel, testChannelHandler);
// trigger selection by writing some bytes from testTarget
testTarget.write(testString.getBytes());
testChannelHandler.waitForBlock();
// test cachedInterestOps
int cachedInterestOps = testChannelHandler.getCachedInterestOps();
assertEquals("cachedInterestOps: "
+ HandlerAdapter.interestToString(cachedInterestOps),