Fixed nsdata which can not access contents of URL

Author: tid-kijyun

Foundation/NSData.swift

@@ -218,7 +218,7 @@ open class NSData : NSObject, NSCopying, NSMutableCopying, NSSecureCoding {
             guard let data = resData else {
                 throw resError!
             }
-            _init(bytes: UnsafeMutableRawPointer(mutating: data._nsObject.bytes), length: length, copy: true)
+            _init(bytes: UnsafeMutableRawPointer(mutating: data._nsObject.bytes), length: data.count, copy: true)
         }
     }
 

TestFoundation/TestNSData.swift

@@ -15,7 +15,7 @@
     import SwiftXCTest
 #endif
 
-class TestNSData: XCTestCase {
+class TestNSData: LoopbackServerTest {
 
     class AllOnesImmutableData : NSData {
         private var _length : Int
@@ -201,6 +201,7 @@ class TestNSData: XCTestCase {
             ("test_openingNonExistentFile", test_openingNonExistentFile),
             ("test_contentsOfFile", test_contentsOfFile),
             ("test_contentsOfZeroFile", test_contentsOfZeroFile),
+            ("test_contentsOfURL", test_contentsOfURL),
             ("test_basicReadWrite", test_basicReadWrite),
             ("test_bufferSizeCalculation", test_bufferSizeCalculation),
             ("test_dataHash", test_dataHash),
@@ -1473,6 +1474,16 @@ extension TestNSData {
 #endif
     }
 
+    func test_contentsOfURL() {
+        let urlString = "http://127.0.0.1:\(TestURLSession.serverPort)/country.txt"
+        let url = URL(string: urlString)!
+        let contents = NSData(contentsOf: url)
+        XCTAssertNotNil(contents)
+        if let contents = contents {
+            XCTAssertTrue(contents.length > 0)
+        }
+    }
+
     func test_basicReadWrite() {
         let url = URL(fileURLWithPath: NSTemporaryDirectory(), isDirectory: true).appendingPathComponent("testfile")
         let count = 1 << 24