Answer by kubi for UITests in Xcode 7 finds wrong 'Next' button

The specific solution to this problem is to look for elements that are descendants of the main window.

func testNextButtonDisabled() {  let app = XCUIApplication()  XCTAssertFalse(app.childrenMatchingType(.Window).elementBoundByIndex(0).buttons["Next"].enabled)}

For a general solution to solve problems like this: In Xcode run the "Record UI Test" again to see how Xcode thinks you should be referencing the element in which you're interested.