XCTest + async/await

xctest_async_test.swift

import XCTest
import _Concurrency

extension XCTestCase {
    func asyncTest(
        expectationDescription: String? = nil,
        timeout: TimeInterval = 3,
        file: StaticString = #file,
        line: Int = #line,
        closure: @escaping () async throws -> ()
    ) {
        let expectation = self.expectation(description: expectationDescription ?? "Async operation")

        _ = Task.runDetached {
            do {
                try await closure()
                expectation.fulfill()
            } catch {
                XCTFail("Error thrown while executing async function @ \(file):\(line): \(error)")
            }
        }

        self.wait(for: [expectation], timeout: timeout)
    }
}