role_type is in boost/beast/core/role.hpp (API Change):

This enumeration is now part of the library core and
not specific to websocket.

include/boost/beast/_experimental/test/impl/stream.hpp

@@ -392,7 +392,7 @@ async_write_some(
 template<class TeardownHandler>
 void
 async_teardown(
-    websocket::role_type,
+    role_type,
     stream& s,
     TeardownHandler&& handler)
 {

include/boost/beast/_experimental/test/impl/stream.ipp

@@ -255,7 +255,7 @@ close_remote()
 
 void
 teardown(
-    websocket::role_type,
+    role_type,
     stream& s,
     boost::system::error_code& ec)
 {

include/boost/beast/_experimental/test/stream.hpp

@@ -13,8 +13,8 @@
 #include <boost/beast/core/detail/config.hpp>
 #include <boost/beast/core/bind_handler.hpp>
 #include <boost/beast/core/flat_buffer.hpp>
+#include <boost/beast/core/role.hpp>
 #include <boost/beast/core/string.hpp>
-#include <boost/beast/websocket/role.hpp>
 #include <boost/beast/_experimental/test/fail_count.hpp>
 #include <boost/asio/async_result.hpp>
 #include <boost/asio/buffer.hpp>
@@ -494,7 +494,7 @@ public:
     BOOST_BEAST_DECL
     void
     teardown(
-        websocket::role_type,
+        role_type,
         stream& s,
         boost::system::error_code& ec);
 
@@ -503,7 +503,7 @@ public:
     BOOST_BEAST_DECL
     void
     async_teardown(
-        websocket::role_type role,
+        role_type role,
         stream& s,
         TeardownHandler&& handler);
 #endif