async-test-case.swift

///
/// A subclass of ``XCTestCase`` that supports async setup and teardown.
///
class XCAsyncTestCase: XCTestCase {
    
    func asyncSetUpWithError() async throws {
        fatalError("Must override")
    }
    
    func asyncTearDownWithError() async throws {
        fatalError("Must override")
    }
    
    override func setUpWithError() async throws {
        wait {
            try await self.asyncSetUpWithError()
        }
    }
    
    override func tearDownWithError() throws {
        wait {
            try await self.asyncTearDownWithError()
        }
    }
    
    func wait(asyncBlock: @escaping (() async throws -> Void)) {
        let semaphore = DispatchSemaphore(value: 0)
        Task.init {
            try await asyncBlock()
            semaphore.signal()
        }
        semaphore.wait()
    }
}