Add #available checks for NSKeyedArchiver methods in tests (#21311)

(cherry picked from commit d8d6c78)

Author: itaiferber

test/stdlib/ErrorBridged.swift

@@ -70,6 +70,8 @@ ErrorBridgingTests.test("NSCopying") {
   }
 }
 
+// Gated on the availability of NSKeyedArchiver.archivedData(withRootObject:).
+@available(macOS 10.11, iOS 9.0, tvOS 9.0, watchOS 2.0, *)
 func archiveAndUnarchiveObject<T: NSCoding>(
   _ object: T
 ) -> T?
@@ -81,11 +83,13 @@ where T: NSObject {
   return unarchiver.decodeObject(of: T.self, forKey: "root")
 }
 ErrorBridgingTests.test("NSCoding") {
-  autoreleasepool {
-    let orig = EnumError.ReallyBadError as NSError
-    let unarchived = archiveAndUnarchiveObject(orig)!
-    expectEqual(orig, unarchived)
-    expectTrue(type(of: unarchived) == NSError.self)
+  if #available(macOS 10.11, iOS 9.0, tvOS 9.0, watchOS 2.0, *) {
+    autoreleasepool {
+      let orig = EnumError.ReallyBadError as NSError
+      let unarchived = archiveAndUnarchiveObject(orig)!
+      expectEqual(orig, unarchived)
+      expectTrue(type(of: unarchived) == NSError.self)
+    }
   }
 }
 

test/stdlib/TestUserInfo.swift

@@ -130,12 +130,16 @@ class TestUserInfo : TestUserInfoSuper {
     func test_classForCoder() {
         // confirm internal bridged impl types are not exposed to archival machinery
         // we have to be circuitous here, as bridging makes it very difficult to confirm this
-        let note = Notification(name: Notification.Name(rawValue: "TestSwiftNotification"), userInfo: [AnyHashable("key"):"value"])
-        let archivedNote = NSKeyedArchiver.archivedData(withRootObject: note)
-        let noteAsPlist = try! PropertyListSerialization.propertyList(from: archivedNote, options: [], format: nil)
-        let plistAsData = try! PropertyListSerialization.data(fromPropertyList: noteAsPlist, format: .xml, options: 0)
-        let xml = NSString(data: plistAsData, encoding: String.Encoding.utf8.rawValue)!
-        expectEqual(xml.range(of: "_NSUserInfoDictionary").location, NSNotFound)
+        //
+        // Gated on the availability of NSKeyedArchiver.archivedData(withRootObject:).
+        if #available(macOS 10.11, iOS 9.0, tvOS 9.0, watchOS 2.0, *) {
+            let note = Notification(name: Notification.Name(rawValue: "TestSwiftNotification"), userInfo: [AnyHashable("key"):"value"])
+            let archivedNote = NSKeyedArchiver.archivedData(withRootObject: note)
+            let noteAsPlist = try! PropertyListSerialization.propertyList(from: archivedNote, options: [], format: nil)
+            let plistAsData = try! PropertyListSerialization.data(fromPropertyList: noteAsPlist, format: .xml, options: 0)
+            let xml = NSString(data: plistAsData, encoding: String.Encoding.utf8.rawValue)!
+            expectEqual(xml.range(of: "_NSUserInfoDictionary").location, NSNotFound)
+        }
     }
 
     func test_AnyHashableContainingNotification() {