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When running unit tests for a second+ time, we often run into:"Failed to create temporary staging dir in <PATH_TO_SIMULATOR>/data/Library/Caches/com.apple.mobile.installd.staging"If we delete derived data, it always works the first run, but then fails on subsequent runs.Something in Xcode is deleting the directory it needs. Has anyone else seen this and found a solution?

Here is some sample code that behaves differently under iOS 12 and earlier vs 13.1/13.2b. Previously, we would get "EUR100.00" but now we get "EUR 100.00" where the space is a non-breaking space.Why was this changed? How can we get consistent behavior from NumberFormatter? let numberFormatter = NumberFormatter() let currencyID = "EUR" let locale = Locale(identifier: "en_US") numberFormatter.formatterBehavior = .behavior10_4 numberFormatter.generatesDecimalNumbers = true numberFormatter.minimumFractionDigits = 2 numberFormatter.maximumFractionDigits = 2 numberFormatter.currencyCode = currencyID numberFormatter.locale = locale numberFormatter.numberStyle = .currency let symbol = "EUR" numberFormatter.currencySymbol = symbol numberFormatter.internationalCurrencySymbol = symbol let number = NSDecimalNumber(integerLiteral: 100) let result = numberFormatter.string(from: number) print("\(String(describing: result))")

We are switching to Xcode 10 and are noticing some issues with Xcode 10's code coverage. Entire swaths of code are getting no coverage. So far I have noticed* Computed vars* class functions in extensions* guard statements in extensionsFor example:import UIKit extension Date { func dayNumberOfWeek() -> Int? { return Calendar.current.dateComponents([.weekday], from: self).weekday } } extension UIView { // Testing with this function compiled will cause no code coverage // for steveWasHereHelper to be generated. // // However, if I comment out steveWasHere, then code coverage for // steveWasHereHelper is generated, despite that this function is also // called by wyattWasHere @discardableResult public class func steveWasHere(value: Int) -> Bool { return self.steveWasHereHelper(value: value) } // The usage of Date here is to try and rule out compiler optimization @discardableResult public class func steveWasHereHelper(value: Int) -> Bool { let d = Date().dayNumberOfWeek() let testValue = value + d! if testValue >= 42 { return true } return false } fileprivate class func neverCalled() { print("This is never called") } // steveWasHereHelper is also called here @discardableResult public class func wyattWasHere(value: Int) -> Bool { return self.steveWasHereHelper(value: value) } }In this example, steveWasHereHelper will not get any coverage. It won't be green, it won't be red, its as if the code is not called. If I remove all tests EXCEPT for the direct test of steveWasHereHelper, it still gets no coverage.HOWEVER, if I then comment out steveWasHere, THEN steveWasHereHelper shows coverage.I have opened a Radar with Apple on this issue (45468318) but I was wondering if anyone else has seen this (This is not the only example of issues with code coverage in Xcode 10) and if there is a workaround.I have also tested this in 10.1b3, getting the same results.self. was added to the function calls just to see if it had any impact.Narrator: It didn't