Merge branch 'pr/67'

Author: parkera

Foundation.xcodeproj/project.pbxproj

@@ -1733,6 +1733,7 @@
 				22B9C1E11C165D7A00DECFF9 /* TestNSDate.swift in Sources */,
 				848A30581C137B3500C83206 /* TestNSHTTPCookie.swift in Sources */,
 				EA66F6541BF1619600136161 /* TestNSSet.swift in Sources */,
+				366C227D1C1649590069EBFD /* TestNSData.swift in Sources */,
 				EA66F64A1BF1619600136161 /* TestNSArray.swift in Sources */,
 				5BC1D8BE1BF3B09E009D3973 /* TestNSCharacterSet.swift in Sources */,
 				EA66F6561BF1619600136161 /* TestNSString.swift in Sources */,

Foundation/NSData.swift

@@ -458,9 +458,22 @@ extension NSData {
         }
         return false
     }
-    
+
+    ///    Write the contents of the receiver to a location specified by the given file URL.
+    ///
+    ///    - parameter url:              The location to which the receiver’s contents will be written.
+    ///    - parameter writeOptionsMask: An option set specifying file writing options.
+    ///
+    ///    - throws: This method returns Void and is marked with the `throws` keyword to indicate that it throws an error in the event of failure.
+    ///
+    ///      This method is invoked in a `try` expression and the caller is responsible for handling any errors in the `catch` clauses of a `do` statement, as described in [Error Handling](https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/ErrorHandling.html#//apple_ref/doc/uid/TP40014097-CH42) in [The Swift Programming Language](https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/index.html#//apple_ref/doc/uid/TP40014097) and [Error Handling](https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/BuildingCocoaApps/AdoptingCocoaDesignPatterns.html#//apple_ref/doc/uid/TP40014216-CH7-ID10) in [Using Swift with Cocoa and Objective-C](https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/BuildingCocoaApps/index.html#//apple_ref/doc/uid/TP40014216).
     public func writeToURL(url: NSURL, options writeOptionsMask: NSDataWritingOptions) throws {
-        NSUnimplemented()
+        guard let path = url.path where url.fileURL == true else {
+            let userInfo = [NSLocalizedDescriptionKey : "The folder at “\(url)” does not exist or is not a file URL.", // NSLocalizedString() not yet available
+                            NSURLErrorKey             : url.absoluteString ?? ""] as Dictionary<String, Any>
+            throw NSError(domain: NSCocoaErrorDomain, code: 4, userInfo: userInfo)
+        }
+        try writeToFile(path, options: writeOptionsMask)
     }
 
     internal func enumerateByteRangesUsingBlockRethrows(block: (UnsafePointer<Void>, NSRange, UnsafeMutablePointer<Bool>) throws -> Void) throws {

TestFoundation/TestNSData.swift

@@ -26,9 +26,23 @@ class TestNSData: XCTestCase {
             ("test_longDebugDescription", test_longDebugDescription),
             ("test_limitDebugDescription", test_limitDebugDescription),
             ("test_edgeDebugDescription", test_edgeDebugDescription),
+            ("test_writeToURLOptions", test_writeToURLOptions),
         ]
     }
 
+    func test_writeToURLOptions() {
+        let saveData = NSData(contentsOfURL: NSBundle.mainBundle().URLForResource("Test", withExtension: "plist")!)
+        let savePath = "/var/tmp/Test.plist"
+        do {
+            try saveData!.writeToFile(savePath, options: NSDataWritingOptions.DataWritingAtomic)
+            let fileManager = NSFileManager.defaultManager()
+            XCTAssertTrue(fileManager.fileExistsAtPath(savePath))
+            try! fileManager.removeItemAtPath(savePath)
+        } catch let error {
+            XCTFail((error as! NSError).localizedDescription)
+        }
+    }
+
     func test_emptyDescription() {
         let expected = "<>"