Consistently use BOOST_TEST instead of BOOST_CHECK in tests

Summary:
related to T13767
We used BOOST_CHECK in older tests and BOOST_TEST macro in newer tests.
Now we use BOOST_TEST consistently.

Reviewers: ivica!

Subscribers: iljazovic, miljen

Differential Revision: https://repo.mireo.local/D31701

test/integration/client.cpp

@@ -20,24 +20,12 @@
 #include <boost/asio/ssl.hpp>
 
 #include <boost/beast/websocket.hpp>
+#include <boost/beast/ssl/ssl_stream.hpp> // async_teardown specialization for websocket ssl stream
 
 #include <boost/system/error_code.hpp>
 
 #include <async_mqtt5.hpp>
 
-namespace boost::beast::websocket {
-
-template <typename TeardownHandler>
-void async_teardown(
-	boost::beast::role_type /* role */,
-	asio::ssl::stream<asio::ip::tcp::socket>& stream,
-	TeardownHandler&& handler
-) {
-	return stream.async_shutdown(std::forward<TeardownHandler>(handler));
-}
-
-} // end namespace boost::beast::websocket
-
 namespace async_mqtt5 {
 
 template <typename StreamBase>