Add test for initializing NSUUID with nil

Author: 0xced

Foundation/NSUUID.swift

@@ -32,7 +32,11 @@ public class NSUUID : NSObject, NSCopying, NSSecureCoding, NSCoding {
     }
 
     public init(UUIDBytes bytes: UnsafePointer<UInt8>) {
-        memcpy(unsafeBitCast(buffer, UnsafeMutablePointer<Void>.self), UnsafePointer<Void>(bytes), 16)
+        if (bytes != nil) {
+            memcpy(unsafeBitCast(buffer, UnsafeMutablePointer<Void>.self), UnsafePointer<Void>(bytes), 16)
+        } else {
+            memset(unsafeBitCast(buffer, UnsafeMutablePointer<Void>.self), 0, 16)
+        }
     }
 
     public func getUUIDBytes(uuid: UnsafeMutablePointer<UInt8>) {

TestFoundation/TestNSUUID.swift

@@ -23,6 +23,7 @@ class TestNSUUID : XCTestCase {
         return [
             ("test_Equality", test_Equality),
             ("test_InvalidUUID", test_InvalidUUID),
+            ("test_InitializationWithNil", test_InitializationWithNil),
         ]
     }
 
@@ -41,4 +42,9 @@ class TestNSUUID : XCTestCase {
         let uuid = NSUUID(UUIDString: "Invalid UUID")
         XCTAssertNil(uuid, "The convenience initializer `init?(UUIDString string:)` must return nil for an invalid UUID string.")
     }
+    
+    func test_InitializationWithNil() {
+        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.")
+    }
 }