pubsub_test failed two cases

[ausk]

env

master@win:/home/user/shadesmar-master/build$ uname -a
Linux win 5.10.16.3-microsoft-standard-WSL2 #1 SMP Fri Apr 2 22:23:49 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux
master@win:/home/user/shadesmar-master/build$ g++ --version
g++ (Ubuntu 9.4.0-1ubuntu1~20.04.1) 9.4.0
Copyright (C) 2019 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

run test

./pubsub_test
Increase buffer_size

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
pubsub_test is a Catch v2.12.1 host application.
Run with -? for options

-------------------------------------------------------------------------------
single_message
-------------------------------------------------------------------------------
/home/user/shadesmar-master/test/pubsub_test.cpp:39
...............................................................................

/home/user/shadesmar-master/test/pubsub_test.cpp:54: FAILED:
  REQUIRE( answer == message )
with expansion:
  0 == 3

Publishing: 1
Increase buffer_size
Publishing: 2
Increase buffer_size
Publishing: 3
Increase buffer_size
Publishing: 4
Increase buffer_size
Publishing: 5
Increase buffer_size
-------------------------------------------------------------------------------
multiple_messages
-------------------------------------------------------------------------------
/home/user/shadesmar-master/test/pubsub_test.cpp:57
...............................................................................

/home/user/shadesmar-master/test/pubsub_test.cpp:78: FAILED:
  REQUIRE( answers == messages )
with expansion:
  {  } == { 1, 2, 3, 4, 5 }

Publishing: 1
Publishing: 2
Publishing: 3
Publishing: 4
Publishing: 5
Subscribe message: 0
Subscriber: 0
Subscriber: 1
Subscriber: 2
Subscribe message: 1
Subscriber: 0
Subscriber: 1
Subscriber: 2
Subscribe message: 2
Subscriber: 0
Subscriber: 1
Subscriber: 2
Subscribe message: 3
Subscriber: 0
Subscriber: 1
Subscriber: 2
Subscribe message: 4
Subscriber: 0
Subscriber: 1
Subscriber: 2
Publishing: 1
Publishing: 2
Publishing: 3
Publishing: 4
Publishing: 5
Subscriber: 0
Subscribe message: 0
Subscribe message: 1
Subscribe message: 2
Subscribe message: 3
Subscribe message: 4
Subscriber: 1
Subscribe message: 0
Subscribe message: 1
Subscribe message: 2
Subscribe message: 3
Subscribe message: 4
Subscriber: 2
Subscribe message: 0
Subscribe message: 1
Subscribe message: 2
Subscribe message: 3
Subscribe message: 4
Publishing: 1
Publishing: 2
Publishing: 3
Publishing: 4
Publishing: 5
Publishing: 1
Publishing: 2
Publishing: 3
Publishing: 4
Publishing: 5
===============================================================================
test cases: 10 |  8 passed | 2 failed
assertions: 33 | 31 passed | 2 failed