This library contains wrappers and utilities to simplify writing tests. As a general rule one needs to check the result of every system call or library call. It‘s important, but it’s also a pain. The wrappers here check the result and only return upon success. E.g., tu_malloc() only returns if malloc succeeded. If the call fails the process is terminated. It‘s possible to be a bit more clever but for the particular things that are wrapped, if the call fails there’s not much point in continuing the test. And if there is a point to continuing the test then don‘t use these wrappers. Note that that means that these calls aren’t to be used willy-nilly. If you're testing, say, memory exhaustion with malloc then you do want to verify that malloc returns NULL and thus you do not want to use the tu_malloc wrapper for this.