Problem Statement
Describe how you would structure unit or integration tests in Swift for asynchronous code using `async/await`, and how you would handle edge cases such as time-outs and cancellations.
Explanation
To test asynchronous code with `async/await` in Swift you mark your test methods with `async` and possibly `throws`. Inside the test you `await` the asynchronous function, then assert the result. You may also use `XCTestExpectation` in older APIs to wait for completions. /n/n For edge cases: you test time-outs by injecting shorter execution times or using mock dependencies, test cancellations by creating a `Task` and cancelling it before completion, and validate correct error propagation. You also make sure your tests don’t depend on real network or UI state by using mocks or stubs. Managing these properly shows your readiness for modern Swift concurrency and testing.
Practice Sets
This question appears in the following practice sets: