Ios 在XCTESCASE的setUp()中等待多个异步调用
在运行Ios 在XCTESCASE的setUp()中等待多个异步调用,ios,swift,asynchronous,xctestcase,Ios,Swift,Asynchronous,Xctestcase,在运行test()方法之前,我需要执行多个调用。我有一个完成块,我正在使用waitforexpections()。因为有不止一个异步调用,所以我使用了一个计数器。我让expection.fulfill()只在计数器达到调用数时发生 override func setUp() { super.setUp() let exp = expectation(description: "waitForSetUp") var counter = 0 // Issue an
test()
方法之前,我需要执行多个调用。我有一个完成块,我正在使用waitforexpections()
。因为有不止一个异步调用,所以我使用了一个计数器。我让expection.fulfill()
只在计数器达到调用数时发生
override func setUp() {
super.setUp()
let exp = expectation(description: "waitForSetUp")
var counter = 0
// Issue an async request
self.addEventToCalendar(title: "Test1", description: "Description test1", startDate: NSDate().addingTimeInterval(-36000), endDate: NSDate()){(success, error) in
if (success) && (error == nil) {
counter = counter + 1
if(counter == 2){exp.fulfill()}
}
}
self.addEventToCalendar(title: "Test2", description: "Description test2", startDate: NSDate(), endDate: NSDate().addingTimeInterval(36000)){(success, error) in
if (success) && (error == nil) {
counter = counter + 1
if(counter == 2){exp.fulfill()}
}
}
waitForExpectations(timeout: 40, handler: nil)
}
这种结构不起作用。test()
方法有时在调用返回之前运行(不总是)
如何使
setUp()
等待返回多个异步调用?我也遇到过类似的情况。我最终要做的解决方案是调用几个函数,这些函数为我的先决条件添加期望值,并将期望值的超时设置为合理的值。在期望的完成处理程序中,我触发了设置算法的下一步。在所有初步步骤通过后,我开始实际的测试逻辑
附加到苹果文档
编辑:请参见下面的示例代码:
class CommonTests: XCTestCase {
var validate: XCTestExpectation? = nil
func testMytest() {
validate(completion: {
loadSomeStuff(completion: { (list: [Stuff]?) in
// actual test
}
})
}
func validate(completion: @escaping ()->()) {
self.validateExpectation = self.expectation(description: "Setup")
// async operation can be fired here
// or if already started from somewhere else just wait for it to complete
self.waitForExpectations(timeout: 60) { (error: Error?) in
XCTAssert((error == nil), error?.localizedDescription ?? "Failed with unknown error")
completion()
}
}
func validateAsyncCompleted() {
self.validateExpectation?.fulfill()
}
func loadStuff(completion: @escaping ([Stuff]?)->()) {
// possible place for assertion or some other checks
let expectation = self.expectation(description: "loading")
DispatchQueue.global().async {
let result: [Stuff]? = nil
// load operation
expectation.fulfill()
completion(result)
}
self.waitForExpectations(timeout: 90) { (error: Error?) in
XCTAssert((error == nil), error?.localizedDescription ?? "load - failed with unknown error")
}
}
}
注意:对于期望有两种方法,第一种方法保存在变量中,因此如果需要,可以从另一个函数中实现,另一种方法在函数体中本地创建并从闭包中实现。您是否尝试实现处理程序并检查可能的错误?