How to check multiple XCTestExpectations using a predicate checking hittable attribute in XCTest

Question

How to check multiple XCTestExpectations using a predicate checking hittable attribute in XCTest

Using the class XCTest XCTWaiter

, I would like to check for predicate

, namely: NSPredicate(format: "hittable == true")

pending XCTNSPredicateExpectation in open

class func wait(for expectations: [XCTestExpectation], timeout seconds: TimeInterval, enforceOrder enforceOrderOfFulfillment: Bool) -> XCTWaiterResult`

I would like to test this predicate against multiple XCTest Expectation. I think this is the most efficient way to check that multiple items are not allowed on a specific screen.

I found that the combination of using the hittable predicate on an array with more than one wait results in an error

`Assertion Failure: <unknown>:0: Neither attributes nor error returned`

If I use the existence predicate, the expectation array validation wait(for:timeout:enforceOrder:)

works well. Also, if the wait array contains only one wait, the check works fine when combined with the hittable predicate

.

Here is a test method that shows the problem, if you run it in an XCTestCase subclass , you need to set ids to something in your application that is simultaneously displayed on the screen:

func testAssertThatMultipleElementsAreHittable() {
    let accessibilityIdentifiers = ["lapTimer", "eventTimer", "startButton", "stopButton"]
    let predicate = NSPredicate(format: "hittable == true") //fails with hittable, but passes with exists!
    var expectations = [XCTNSPredicateExpectation]()

    accessibilityIdentifiers.forEach { (identifier) in
        expectations.append(XCTNSPredicateExpectation(predicate: predicate, object: XCUIApplication().descendants(matching: .any)[identifier]))
    }

    let result = XCTWaiter.wait(for: expectations, timeout: 5.0, enforceOrder: false)
    if result != .completed { 
        XCTFail("waiting failed!")
    }
}