我是一名经验丰富的iOS开发人员，我注意到了一些以前没有注意到的事情，那就是当您创建一个新的XCTestCase类时，它的示例测试函数末尾都有这个新词“throws”，我想知道为什么（因为我以前从来没有添加过它，我只是去了func testThisThing（），末尾没有“throws”），我想知道这是否是一个新的标准实践？我看了苹果的文档，他们似乎也在他们的例子中使用它...
下面是从Xcode生成的XCTestCase类的样子：

class BasicTests: XCTestCase {

    override func setUpWithError() throws {
        // Put setup code here. This method is called before the invocation of each test method in the class.
    }

    override func tearDownWithError() throws {
        // Put teardown code here. This method is called after the invocation of each test method in the class.
    }

    func testExample() throws {
        // This is an example of a functional test case.
        // Use XCTAssert and related functions to verify your tests produce the correct results.
        // Any test you write for XCTest can be annotated as throws and async.
        // Mark your test throws to produce an unexpected failure when your test encounters an uncaught error.
        // Mark your test async to allow awaiting for asynchronous code to complete. Check the results with assertions afterwards.
    }

    func testPerformanceExample() throws {
        // This is an example of a performance test case.
        self.measure {
            // Put the code you want to measure the time of here.
        }
    }

}

正如你在testExample（）和testPerformanceExample（）的末尾看到的，它写的是“throws”，为什么这是一个新的练习，它的意思是什么，如果我不包括“throws”，它的意思是什么？
干杯