Can I check if expectations have been met, without panicing if they haven't?

[dnaaun]

I want this because I'm using mockall in a wasm context, where due to the nature of the JS event loop, I have to do the equivalent of Jest's waitFor to make sure that a mock has been hit, and Rust doesn't let me catch panics on wasm.

[asomers]

Not really. The only supported way to verify expectations is by dropping the mock object or by calling its checkpoint method, which panics on failure. You could try catching those panics yourself, within your test method. Or, though it's undocumented and unstable, you could try checking Mockall's private metadata. It's technically pub, since the proc macro must access it, but the docs are hidden. It would be something like:

let foo = MockFoo::new();
let expectation = foo.expect_methodname()... ;
...
expectation.common.times.is_satisfied()