EXC_BREAKPOINT breaking tests in Xcode 16.4

Question

In trying to run tests on my app in Swift, I am encountering a problem. I do not have any breakpoints set, and yet, the execution of the tests is being interrupted on the line containing "throw errorResult", with this:

Thread 23: EXC_BREAKPOINT (code=1, subcode=0x180d7bc70)

This error is handled as you can see in the second code snippet. How can I prevent this from interrupting testing? This is expected behaviour that I am trying to test. This does not happen if I delete this line and instead throw a generic error.

 func doTheBiz<T: Decodable>(
    query: GQLQuery,
    serviceApiConfig: ServiceApiConfig
) async throws -> T {
    capturedQueryString = query.body
    
    if let successResult = successResult, let result = successResult as? T {
        return result
    } else if let errorResult = errorResult {
        throw errorResult // stops here
    } else {
        throw NSError.generic()
    }
}

This is the context for the call:

do {
    ...
    bizInfo = try await bizService.doTheBiz(...)
    ...
    self.state = .data
} catch {
    if state == .data { return }
    self.handleFailureResponse(error)
}

These tests ran absolutely fine in Xcode 16.2.

Are you sure you don't happen to have an exception breakpoint or Swift error breakpoint added to your project? — David Pasztor
– David Pasztor, Commented Jun 11 at 13:00
Yes, I'm sure. I have posted the actual reason as an answer. — ratbum
– ratbum, Commented Jun 11 at 13:01

ratbum · Accepted Answer · 2025-06-11 12:53:34Z

0

This was happening because of the way we were mocking errors.

Old code:

mockBizService.errorResult = NSError()

New code:

mockBizService.errorResult = NSError(domain: "com.biz.test", code: 0, userInfo: nil)

answered Jun 11 at 12:53

ratbum

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