refactor: rename testbench to test.

- rename testbench to test.
- add benchmark for future development.

test/yycc/windows/com.cpp

@@ -0,0 +1,16 @@
+#include <gtest/gtest.h>
+#include <yycc.hpp>
+#include <yycc/windows/com.hpp>
+
+#define COM ::yycc::windows::com
+
+namespace yycctest::windows::com {
+#if defined(YYCC_OS_WINDOWS) && defined(YYCC_STL_MSSTL)
+
+    TEST(WindowsCom, IsInitialized) {
+        // COM environment should always be ready.
+        EXPECT_TRUE(COM::is_initialized());
+    }
+
+#endif
+}