XCTestExpectation 似乎在 Task() 中不起作用

Question

我正在尝试运行发出网络请求的测试 actor，如果您在它仍有请求时调用它，它将取消第一个请求并抛出 CancellationError.我使用 Task() 来模拟它被异步调用两次，代码似乎工作正常。我可以看到正确的错误被抛出并且 catch-block 被执行。下面是代码。

func testCancellation() async throws {
    //setup code

    let expectation = XCTestExpectation(description: "Cancellation Error thrown")
    let autocompleteHandler = AutocompleteHandler(session: session)
        
    Task() {
        do {
            let _ = try await autocompleteHandler.autocomplete(query: "Grizzly Bear")
        } catch {
            if error is CancellationError { expectation.fulfill() }
        }
    }
    Task() {
        do {
            let _ = try await autocompleteHandler.autocomplete(query: "Grizzly Bear")
        } catch {
            if error is CancellationError { expectation.fulfill() }
        }
    }
        
    wait(for: [expectation], timeout: 1)
}

当运行执行此操作时，出现以下错误：

Asynchronous wait failed: Exceeded timeout of 1 seconds, with unfulfilled expectations: "Cancellation Error thrown".

但正如我所说。我可以看到 catch 块正在执行，error 是正确的类型并且正在调用 expectation.fulfill()。

Answer 1

看完@Alexander 的评论后，我意识到我确实不需要等待任何事情。我将代码重新格式化为以下内容，现在可以使用了。

func testCancellation() async {
    //Setup code

    let autocompleteHandler = AutocompleteHandler(session: session)
        
    async let first = autocompleteHandler.autocomplete(query: "Grizzly Bear")
    async let second = autocompleteHandler.autocomplete(query: "Grizzly Bear")
        
    do {
        let _ = [try await first, try await second]
        XCTFail("Should have thrown cancellation error")
    } catch {
        XCTAssert(error is CancellationError)
    }
}

这按预期工作。

XCTestExpectation 似乎在 Task() 中不起作用

XCTestExpectation does not seem to work in Task()

swift

async-await

task

xctest

ios15