提问人:meaning-matters 提问时间:5/9/2018 最后编辑:meaning-matters 更新时间:3/8/2023 访问量:23438
如何在 XCTest 中等待 T 秒而不会出现超时错误?
How to wait in a XCTest for T seconds without timeout error?
问:
我想在不生成超时的情况下将测试进度延迟 T 秒。
首先,我尝试了显而易见的方法:
sleep(5)
XCTAssert(<test if state is correct after this delay>)
但这失败了。
然后我试了一下:
let promise = expectation(description: "Just wait 5 seconds")
waitForExpectations(timeout: 5) { (error) in
promise.fulfill()
XCTAssert(<test if state is correct after this delay>)
}
我现在成功了。但因超时而失败。XCTAssert()
waitForExpectations()
这是根据 XCTest
等待函数的文档说的:
超时始终被视为测试失败。
我有哪些选择?
答:
80赞
A.Munzer
5/9/2018
#1
可以使用 XCTWaiter.wait 函数。
例如:
let exp = expectation(description: "Test after 5 seconds")
let result = XCTWaiter.wait(for: [exp], timeout: 5.0)
if result == XCTWaiter.Result.timedOut {
XCTAssert(<test if state is correct after this delay>)
} else {
XCTFail("Delay interrupted")
}
28赞
Robin Stewart
1/11/2021
#2
如果您知道某件事需要多少时间,并且只想等待该持续时间然后再继续测试,则可以使用以下一行:
_ = XCTWaiter.wait(for: [expectation(description: "Wait for n seconds")], timeout: 2.0)
13赞
André Henrique da Silva
3/26/2021
#3
对我最有效的是:
let timeInSeconds = 2.0 // time you need for other tasks to be finished
let expectation = XCTestExpectation(description: "Your expectation")
DispatchQueue.main.asyncAfter(deadline: .now() + timeInSeconds) {
expectation.fulfill()
}
wait(for: [expectation], timeout: timeInSeconds + 1.0) // make sure it's more than what you used in AsyncAfter call.
//do your XCTAssertions here
XCTAssertNotNil(value)
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