Thanks! Where does the "want" come from to compare your "got"s to? If the customer code handles errors gracefully, can you still surface undesirable behavior?
We provide a bunch of different ways for you to express your test properties. (1) A lot of stuff we can detect automatically, like crashes, OOMs, etc. (2) You should turn on assertions in all the code you send to us. (3) We can write generalized temporal regexes against your log messages or other output. (4) We offer SDKs that allow you to declare test properties inline in your code. (5) We can integrate with off-the-shelf sanitizers like ASAN, the Go race detector, etc.