Test fails when asserting dates - ios

Question

I am trying to verify that two items I am storing are the same. However, while testing I am getting an error when checking a Date property.
Note: my Item class implements the Equatable protocol.
This is my setUp method:
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
}
}
This is the extension of my test class:
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)
}
}
}
This is my test:
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)
}
This is the implementation of the save() method:
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)
}
}
}
}
}
I am having trouble trying to figure out what is wrong with this. The error I am getting is:
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))))))") -
As it can be clearly seen, the problem is that the timestamp is not the same in both, and I have no idea why it is changing.
EDIT: As #ganzogo found, there is a difference of exactly 18 hours between this too items. I am living in Ecuador which is GTM-5. Perhaps this could be a cue to figure out the problem.

Answer 1

After your line:
let dateFormatter = DateFormatter()
Try this:
dateFormatter.timeZone = TimeZone(secondsFromGMT: 64800)
If that doesn't work, try:
dateFormatter.timeZone = TimeZone(secondsFromGMT: -64800)
:-)
But you're kind of defeating the purpose of a unit test if you're just hacking it until in passes. You really need to understand whether the testItem or the item is exhibiting the correct behaviour right now, and that will depend on your application.

Answer 2

In func
test_Save_UsesGeocoderToGetCoordinateFromAddress()
timestamp transform to sut.dateTextField.text，then
In sut.save()
sut.dateTextField.text
transform to timestamp, the minute and second are drop