Add test for NSUUID.UUIDString

Author: 0xced

Foundation/NSUUID.swift

@@ -46,8 +46,8 @@ public class NSUUID : NSObject, NSCopying, NSSecureCoding, NSCoding {
     public var UUIDString: String {
         get {
             let strPtr = UnsafeMutablePointer<Int8>.alloc(37)
-            _cf_uuid_unparse_upper(buffer, strPtr)
-            return String(strPtr)
+            _cf_uuid_unparse_lower(buffer, strPtr)
+            return String.fromCString(strPtr)!
         }
     }
 

TestFoundation/TestNSUUID.swift

@@ -24,6 +24,7 @@ class TestNSUUID : XCTestCase {
             ("test_Equality", test_Equality),
             ("test_InvalidUUID", test_InvalidUUID),
             ("test_InitializationWithNil", test_InitializationWithNil),
+            ("test_UUIDString", test_UUIDString),
         ]
     }
 
@@ -47,4 +48,9 @@ class TestNSUUID : XCTestCase {
         let uuid = NSUUID(UUIDBytes: nil)
         XCTAssertEqual(uuid, NSUUID(UUIDBytes: [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]), "The convenience initializer `init(UUIDBytes bytes:)` must return the Nil UUID when UUIDBytes is nil.")
     }
+    
+    func test_UUIDString() {
+        let uuid = NSUUID(UUIDBytes: [0xe6,0x21,0xe1,0xf8,0xc3,0x6c,0x49,0x5a,0x93,0xfc,0x0c,0x24,0x7a,0x3e,0x6e,0x5f])
+        XCTAssertEqual(uuid.UUIDString, "e621e1f8-c36c-495a-93fc-0c247a3e6e5f", "The UUIDString representation must be lowercase as defined by RFC 4122.")
+    }
 }