feat: All tests run in a child process now.

cpp_test.cpp

@@ -0,0 +1,8 @@
+#include "set.h"
+#include "set_asserts.h"
+
+TEST(Basic) { ASSERT_EQ(2, 2); }
+
+SUIT(Basic) { ADD_TEST(Basic); }
+
+BUNDLE() { ADD_SUIT(Basic); }