[NSTimeZone] Add implementation of abbreviation property and tests

This adds the implementation of NSTimeZone's `abbreviation` property and a test case for it.

Author: thii

Foundation.xcodeproj/project.pbxproj

@@ -196,6 +196,7 @@
 		5BF7AEBF1BCD51F9008F214A /* NSURL.swift in Sources */ = {isa = PBXBuildFile; fileRef = 5BDC3F4A1BCC5DCB00ED97BB /* NSURL.swift */; };
 		5BF7AEC01BCD51F9008F214A /* NSUUID.swift in Sources */ = {isa = PBXBuildFile; fileRef = 5BDC3F4B1BCC5DCB00ED97BB /* NSUUID.swift */; };
 		5BF7AEC11BCD51F9008F214A /* NSValue.swift in Sources */ = {isa = PBXBuildFile; fileRef = 5BDC3F4C1BCC5DCB00ED97BB /* NSValue.swift */; };
+		84BA558E1C16F90900F48C54 /* TestNSTimeZone.swift in Sources */ = {isa = PBXBuildFile; fileRef = 84BA558D1C16F90900F48C54 /* TestNSTimeZone.swift */; };
 		C93559291C12C49F009FD6A9 /* TestNSAffineTransform.swift in Sources */ = {isa = PBXBuildFile; fileRef = C93559281C12C49F009FD6A9 /* TestNSAffineTransform.swift */; };
 		E876A73E1C1180E000F279EC /* TestNSRange.swift in Sources */ = {isa = PBXBuildFile; fileRef = E876A73D1C1180E000F279EC /* TestNSRange.swift */; };
 		EA66F6361BEED03E00136161 /* TargetConditionals.h in Headers */ = {isa = PBXBuildFile; fileRef = EA66F6351BEED03E00136161 /* TargetConditionals.h */; settings = {ATTRIBUTES = (Public, ); }; };
@@ -519,6 +520,7 @@
 		5BDC3FCF1BCF17E600ED97BB /* NSCFSet.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = NSCFSet.swift; sourceTree = "<group>"; };
 		5BDC405C1BD6D83B00ED97BB /* TestFoundation.app */ = {isa = PBXFileReference; explicitFileType = wrapper.cfbundle; includeInIndex = 0; path = TestFoundation.app; sourceTree = BUILT_PRODUCTS_DIR; };
 		5BF7AEC21BCD568D008F214A /* ForSwiftFoundationOnly.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = ForSwiftFoundationOnly.h; sourceTree = "<group>"; };
+		84BA558D1C16F90900F48C54 /* TestNSTimeZone.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = TestNSTimeZone.swift; sourceTree = "<group>"; };
 		C93559281C12C49F009FD6A9 /* TestNSAffineTransform.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = TestNSAffineTransform.swift; sourceTree = "<group>"; };
 		E876A73D1C1180E000F279EC /* TestNSRange.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = TestNSRange.swift; sourceTree = "<group>"; };
 		EA313DFC1BE7F2E90060A403 /* CFURLComponents_Internal.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = CFURLComponents_Internal.h; sourceTree = "<group>"; };
@@ -1024,6 +1026,7 @@
 				525AECEB1BF2C96400D15BB0 /* TestNSFileManager.swift */,
 				5B40F9F11C125187000E72E3 /* TestNSXMLParser.swift */,
 				22B9C1E01C165D7A00DECFF9 /* TestNSDate.swift */,
+				84BA558D1C16F90900F48C54 /* TestNSTimeZone.swift */,
 			);
 			name = Tests;
 			sourceTree = "<group>";
@@ -1711,6 +1714,7 @@
 				E876A73E1C1180E000F279EC /* TestNSRange.swift in Sources */,
 				EA66F6521BF1619600136161 /* TestNSPropertyList.swift in Sources */,
 				4DC1D0801C12EEEF00B5948A /* TestNSPipe.swift in Sources */,
+				84BA558E1C16F90900F48C54 /* TestNSTimeZone.swift in Sources */,
 				52829AD71C160D64003BC4EF /* TestNSCalendar.swift in Sources */,
 				C93559291C12C49F009FD6A9 /* TestNSAffineTransform.swift in Sources */,
 				EA66F64E1BF1619600136161 /* TestNSIndexSet.swift in Sources */,

Foundation/NSTimeZone.swift

@@ -162,7 +162,15 @@ extension NSTimeZone {
     public class func timeZoneDataVersion() -> String { NSUnimplemented() }
 
     public var secondsFromGMT: Int { NSUnimplemented() }
-    public var abbreviation: String? { NSUnimplemented() }
+
+    /// The abbreviation for the receiver, such as "EDT" (Eastern Daylight Time). (read-only)
+    ///
+    /// This invokes `abbreviationForDate:` with the current date as the argument.
+    public var abbreviation: String? {
+        let currentDate = NSDate()
+        return abbreviationForDate(currentDate)
+    }
+
     public var daylightSavingTime: Bool { NSUnimplemented() }
     public var daylightSavingTimeOffset: NSTimeInterval { NSUnimplemented() }
     /*@NSCopying*/ public var nextDaylightSavingTimeTransition: NSDate?  { NSUnimplemented() }

TestFoundation/TestNSTimeZone.swift

@@ -0,0 +1,34 @@
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2015 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See http://swift.org/LICENSE.txt for license information
+// See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+
+
+
+#if DEPLOYMENT_RUNTIME_OBJC || os(Linux)
+    import Foundation
+    import XCTest
+#else
+    import SwiftFoundation
+    import SwiftXCTest
+#endif
+
+
+
+class TestNSTimeZone: XCTestCase {
+
+    var allTests : [(String, () -> ())] {
+        return [
+            ("test_abbreviation", test_abbreviation),
+        ]
+    }
+
+    func test_abbreviation() {
+        let tz = NSTimeZone.systemTimeZone()
+        XCTAssertEqual(tz.abbreviation, tz.abbreviationForDate(NSDate()))
+    }
+}

TestFoundation/main.swift

@@ -37,4 +37,5 @@ XCTMain([
     TestNSRange(),
     TestNSXMLParser(),
     TestNSDate(),
+    TestNSTimeZone(),
 ])