[question] [swift] Is fuzzer capable of intercepting failures in Swift code?

[dodikk]

 NSArray *reports = [runner enumerateMutantsUsingBlock:^(NSDictionary *mutant) {
    [deserializer deserializeUser:mutant];
  }];

We need to check if failures are recorded properly if deserializer is written Swift and mention the status in the readme.

---

As far as I know, the main sources of failures are

• force unwrapped optionals (operator !)
• force exception handlers (try!)
• force casts (as!)
• unowned captures in closures

[AlexDenisov]

Good point, I didn't check those cases.

[dodikk]

I've tried

• force unwrapped optionals
• fatalError() function

Fuzzer runner fails to intercept both of them and the entire test bundle stops. For some reason the xcode's test report contains more than one test case with a crash and contains no records about other crash-free test cases.

Either xcode it has some treshold or the reason is "XCTest parallelizes test runs".

[dodikk]

Seems like Fuzzer might need an implementation of something like this https://github.com/Quick/Nimble/issues/234