add some unit test for dubbo-auth

[CodingSinger]

#5461

[codecov-io]

Codecov Report

Merging #5547 into master will decrease coverage by 0.09%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##             master    #5547     +/-   ##
===========================================
- Coverage     61.26%   61.16%   -0.1%     
+ Complexity      422      421      -1     
===========================================
  Files           922      922             
  Lines         37498    37498             
  Branches       5431     5431             
===========================================
- Hits          22974    22937     -37     
- Misses        12048    12078     +30     
- Partials       2476     2483      +7

Impacted Files	Coverage Δ	Complexity Δ
...va/org/apache/dubbo/remoting/TimeoutException.java	22.22% <0%> (-11.12%)	0% <0%> (ø)
...dubbo/remoting/exchange/support/DefaultFuture.java	79.27% <0%> (-9.91%)	0% <0%> (ø)
.../remoting/transport/netty4/NettyServerHandler.java	59.09% <0%> (-9.1%)	0% <0%> (ø)
.../apache/dubbo/rpc/protocol/AsyncToSyncInvoker.java	79.16% <0%> (-8.34%)	0% <0%> (ø)
...ng/transport/dispatcher/all/AllChannelHandler.java	62.06% <0%> (-6.9%)	0% <0%> (ø)
.../org/apache/dubbo/remoting/ExecutionException.java	15.78% <0%> (-5.27%)	0% <0%> (ø)
.../remoting/transport/netty4/NettyClientHandler.java	59.32% <0%> (-5.09%)	0% <0%> (ø)
...che/dubbo/remoting/transport/mina/MinaChannel.java	50% <0%> (-3.95%)	16% <0%> (-1%)
...pache/dubbo/remoting/transport/AbstractServer.java	53.75% <0%> (-3.75%)	0% <0%> (ø)
...e/dubbo/remoting/transport/netty/NettyChannel.java	52.27% <0%> (-3.41%)	19% <0%> (-1%)
... and 6 more

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