Merge pull request #1809 from ogres/nsnull-description

Author: swift-ci

Foundation/NSNull.swift

@@ -34,6 +34,10 @@ open class NSNull : NSObject, NSCopying, NSSecureCoding {
         return true
     }
 
+    open override var description: String {
+        return "<null>"
+    }
+    
     open override func isEqual(_ object: Any?) -> Bool {
         return object is NSNull
     }

TestFoundation/TestNSNull.swift

@@ -11,7 +11,8 @@ class TestNSNull : XCTestCase {
 
     static var allTests: [(String, (TestNSNull) -> () throws -> Void)] {
         return [
-            ("test_alwaysEqual", test_alwaysEqual)
+            ("test_alwaysEqual", test_alwaysEqual),
+            ("test_description", test_description),
         ]
     }
 
@@ -34,4 +35,8 @@ class TestNSNull : XCTestCase {
         //Make sure that NSNull() != .None
         XCTAssertNotEqual(null_1, null_4)        
     }
+    
+    func test_description() {
+        XCTAssertEqual(NSNull().description, "<null>")
+    }
 }

TestFoundation/main.swift

@@ -86,7 +86,6 @@ XCTMain([
     testCase(TestURLResponse.allTests),
     testCase(TestHTTPURLResponse.allTests),
     testCase(TestURLSession.allTests),
-    testCase(TestNSNull.allTests),
     testCase(TestNSUUID.allTests),
     testCase(TestNSValue.allTests),
     testCase(TestUserDefaults.allTests),