The intent of this test is to exercise some error handling in CppUTest's memory leak detection feature. However, as far as I can tell, delete (char*) 0x1234678; is undefined behavior regardless of the use of a custom delete implementation. This test is known to hang when compiled with clang-cl. I have #1676 open to remove this test. In the meantime, I recommend disabling CppUTest's leak detection for your usage.

Ok ok, I merged the open PR.