[C++] small test fix #1002

Job	Run time
C++ Clang 9 (Ubuntu 20.04)	1m 32s
C++ Clang 13 (Ubuntu 22.04)	1m 22s
C++ Clang 10 (Ubuntu 20.04)	1m 48s
C++ Xcode (macOS)	2m 23s
C++ Clang 14 (Ubuntu 22.04)	1m 20s
C++ Clang 11 (Ubuntu 20.04)	1m 25s
C++ GCC 6 (Ubuntu 20.04)	1m 38s
C++ Clang 15 (Ubuntu 22.04)	1m 23s
C++ GCC 7 (Ubuntu 20.04)	1m 27s
C++ Clang 12 (Ubuntu 20.04)	1m 36s
C++ Clang 16 (Ubuntu 22.04)	1m 20s
C++ GCC 8 (Ubuntu 20.04)	1m 25s
C++ GCC 11 (Ubuntu 22.04)	1m 26s
C++ Clang 17 (Ubuntu 22.04)	1m 22s
C++ GCC 9 (Ubuntu 20.04)	1m 35s
C++ GCC 12 (Ubuntu 22.04)	1m 31s
C++ MSVC (Windows) (windows-latest)	3m 7s
C++ GCC 10 (Ubuntu 20.04)	2m 3s
C++ GCC 13 (Ubuntu 22.04)	1m 29s
C# 8.0.x	2m 27s
Java 8 (ubuntu-22.04)	1m 21s
Rust stable	58s
Java 8 (windows-latest)	1m 57s
Rust beta	57s
Java 17 (ubuntu-22.04)	1m 34s
Rust nightly	52s
Java 17 (windows-latest)	2m 6s
Java 21 (ubuntu-22.04)	1m 34s
Java 21 (windows-latest)	2m 12s
	47m 10s

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