ios - 断言日期时测试失败

Question

我正在尝试验证我存储的两个项目是否相同。但是，在测试期间，我在检查 Date 属性时遇到错误。

注意:我的 Item 类实现了 Equatable 协议(protocol)。

这是我的设置方法:

class InputViewControllerTests: XCTestCase {

    var sut: InputViewController!
    var placemark: MockPlacemark!

    override func setUp() {
        super.setUp()
        let storyboard = UIStoryboard(name: "Main",
                                      bundle: nil)
        sut = storyboard
            .instantiateViewController(
                withIdentifier: "InputViewController")
            as! InputViewController
        _ = sut.view
    }
}

这是我的测试类的扩展:

extension InputViewControllerTests {
    class MockGeocoder: CLGeocoder {
        var completionHandler: CLGeocodeCompletionHandler?
        override func geocodeAddressString(
            _ addressString: String,
            completionHandler: @escaping CLGeocodeCompletionHandler) {
            self.completionHandler = completionHandler
        }
    }

    class MockPlacemark : CLPlacemark {
        var mockCoordinate: CLLocationCoordinate2D?
        override var location: CLLocation? {
            guard let coordinate = mockCoordinate else
            { return CLLocation() }
            return CLLocation(latitude: coordinate.latitude,
                              longitude: coordinate.longitude)
        }
    }
}

这是我的测试:

func test_Save_UsesGeocoderToGetCoordinateFromAddress() {
        let dateFormatter = DateFormatter()
        dateFormatter.dateFormat = "MM/dd/yyyy"
        let timestamp = 1456095600.0
        let date = Date(timeIntervalSince1970: timestamp)
        sut.titleTextField.text = "Foo"
        sut.dateTextField.text = dateFormatter.string(from: date)
        sut.locationTextField.text = "Bar"
        sut.addressTextField.text = "Infinite Loop 1, Cupertino"
        sut.descriptionTextField.text = "Baz"
        let mockGeocoder = MockGeocoder()
        sut.geocoder = mockGeocoder
        sut.itemManager = ItemManager()
        sut.save()
        placemark = MockPlacemark()
        let coordinate = CLLocationCoordinate2DMake(37.3316851,
                                                    -122.0300674)
        placemark.mockCoordinate = coordinate
        mockGeocoder.completionHandler?([placemark], nil)
        let item = sut.itemManager?.item(at: 0)
        let testItem = ToDoItem(title: "Foo",
                                itemDescription: "Baz",
                                timestamp: timestamp,
                                location: Location(name: "Bar",
                                                   coordinate: coordinate))
        XCTAssertEqual(item, testItem)
    }

这是 save() 方法的实现:

class InputViewController: UIViewController {
    // ...
    @IBAction func save() {
        guard let titleString = titleTextField.text,
            titleString.characters.count > 0 else { return }
        let date: Date?
        if let dateText = self.dateTextField.text,
            dateText.characters.count > 0 {
            date = dateFormatter.date(from: dateText)
        } else {
            date = nil
        }
        let descriptionString = descriptionTextField.text
        if let locationName = locationTextField.text,
            locationName.characters.count > 0 {
            if let address = addressTextField.text,
                address.characters.count > 0 {
                geocoder.geocodeAddressString(address) {
                    [unowned self] (placeMarks, error) -> Void in
                    let placeMark = placeMarks?.first
                    let item = ToDoItem(
                        title: titleString,
                        itemDescription: descriptionString,
                        timestamp: date?.timeIntervalSince1970,
                        location: Location(
                            name: locationName,
                            coordinate: placeMark?.location?.coordinate))
                    self.itemManager?.add(item)
                }
            }
        }
    }
}

我无法弄清楚这有什么问题。我得到的错误是:

test_Save_UsesGeocoderToGetCoordinateFromAddress()] failed: XCTAssertEqual failed: ("Optional(ToDo.ToDoItem(title: "Foo", itemDescription: Optional("Baz"), timestamp: Optional(1456030800.0), location: Optional(ToDo.Location(name: "Bar", coordinate: Optional(__C.CLLocationCoordinate2D(latitude: 37.331685100000001, longitude: -122.03006739999999))))))") is not equal to ("Optional(ToDo.ToDoItem(title: "Foo", itemDescription: Optional("Baz"), timestamp: Optional(1456095600.0), location: Optional(ToDo.Location(name: "Bar", coordinate: Optional(__C.CLLocationCoordinate2D(latitude: 37.331685100000001, longitude: -122.03006739999999))))))") -

可以清楚地看到，问题是两者的时间戳不一样，我不知道为什么会发生变化。

编辑:正如@ganzogo 所发现的，这两个项目之间也存在 18 小时的差异。我住在 GTM-5 的厄瓜多尔。也许这可能是找出问题的线索。

Answer 1

在你的行之后:

let dateFormatter = DateFormatter()

试试这个:

dateFormatter.timeZone = TimeZone(secondsFromGMT: 64800)

如果还是不行，试试:

dateFormatter.timeZone = TimeZone(secondsFromGMT: -64800)

:-)

但是，如果您只是对单元测试进行修改直到通过，那么您就有点违背了单元测试的目的。您确实需要了解 testItem 或 item 现在是否表现出正确的行为，这取决于您的应用程序。