[Pitch] Test cancellation

Evolution Pitches
,
18

Hi Jonathan,

Having an option to cancel all test cases when one fails at once sounds like a smart addition. Especially if tests are expensive to run.

For the cancel a single test case case, is there a difference between Test.Case.cancel and Issue.record (and return-ing early)?

For instance, is there a difference in behaviour between the code example:

@Test(arguments: Species.all(in: .dinosauria))
func `Are all dinosaurs extinct?`(_ species: Species) throws {
    if species.in(.aves)  {
        try Test.Case.cancel("\(species) is birds!")
    }
    // ...
}

and what is suggested in Migrating a test from XCTest | Apple Developer Documentation :

@Test(arguments: Species.all(in: .dinosauria))
func `Are all dinosaurs extinct?`(_ species: Species) throws {
    if species.in(.aves)  {
        Issue.record("\(species) is birds!")
        return
    }
    // ...
}

I.e. is this an api improvement (not having to worry about early return is a win in itself) and/or is there an actual behavioural difference?