             
             XCTAssertEqual(sf, stringResult)
         }
-#endif
 
         let quarterTimestamps: [Double : String] = [
             1451679712 : "1", 1459542112 : "2", 1467404512 : "3", 1475353312 : "4"

        f.timeZone = TimeZone(identifier: DEFAULT_TIMEZONE)
        f.locale = Locale(identifier: DEFAULT_LOCALE)

#if os(macOS) // timestyle zzzz is currently broken on Linux
        f.dateFormat = "EEEE, MMMM d, y 'at' hh:mm:ss a zzzz"
        for (timestamp, stringResult) in timestamps {
            


    func test_dateFormatString() {
        let f = DateFormatter()
        f.locale = Locale(identifier: DEFAULT_LOCALE)
        f.timeZone = TimeZone(abbreviation: DEFAULT_TIMEZONE)
        
        // .medium cases fail for the date part on Linux and so have been commented out.
        let formats: [String: (DateFormatter.Style, DateFormatter.Style)] = [
            "": (.none, .none),
            "h:mm a": (.none, .short),
            "h:mm:ss a": (.none, .medium),
            "h:mm:ss a z": (.none, .long),
            "h:mm:ss a zzzz": (.none, .full),
            "M/d/yy": (.short, .none),
            "M/d/yy, h:mm a": (.short, .short),
            "M/d/yy, h:mm:ss a": (.short, .medium),
            "M/d/yy, h:mm:ss a z": (.short, .long),
            "M/d/yy, h:mm:ss a zzzz": (.short, .full),
            "MMM d, y": (.medium, .none),
            //"MMM d, y 'at' h:mm a": (.medium, .short),
            //"MMM d, y 'at' h:mm:ss a": (.medium, .medium),
            //"MMM d, y 'at' h:mm:ss a z": (.medium, .long),
            //"MMM d, y 'at' h:mm:ss a zzzz": (.medium, .full),
            "MMMM d, y": (.long, .none),
            "MMMM d, y 'at' h:mm a": (.long, .short),
            "MMMM d, y 'at' h:mm:ss a": (.long, .medium),
            "MMMM d, y 'at' h:mm:ss a z": (.long, .long),
            "MMMM d, y 'at' h:mm:ss a zzzz": (.long, .full),
            "EEEE, MMMM d, y": (.full, .none),
            "EEEE, MMMM d, y 'at' h:mm a": (.full, .short),
            "EEEE, MMMM d, y 'at' h:mm:ss a": (.full, .medium),
            "EEEE, MMMM d, y 'at' h:mm:ss a z": (.full, .long),
            "EEEE, MMMM d, y 'at' h:mm:ss a zzzz": (.full, .full),
        ]
        
        for (dateFormat, styles) in formats {
