[C++]: make sure test is explicit on size.
[C++]: make sure test is explicit on size.

mikeb01/Aeron,real-logic/Aeron,real-logic/Aeron,galderz/Aeron,galderz/Aeron,EvilMcJerkface/Aeron,mikeb01/Aeron,galderz/Aeron,real-logic/Aeron,real-logic/Aeron,mikeb01/Aeron,EvilMcJerkface/Aeron,EvilMcJerkface/Aeron,EvilMcJerkface/Aeron,mikeb01/Aeron,galderz/Aeron