| // This source file is part of the Swift.org open source project |
| // |
| // Copyright (c) 2014 - 2016 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 |
| // |
| |
| class TestNSNull : XCTestCase { |
| |
| static var allTests: [(String, (TestNSNull) -> () throws -> Void)] { |
| return [ |
| ("test_alwaysEqual", test_alwaysEqual), |
| ("test_description", test_description), |
| ] |
| } |
| |
| func test_alwaysEqual() { |
| let null_1 = NSNull() |
| let null_2 = NSNull() |
| |
| let null_3: NSNull? = NSNull() |
| let null_4: NSNull? = nil |
| |
| //Check that any two NSNull's are == |
| XCTAssertEqual(null_1, null_2) |
| |
| //Check that any two NSNull's are ===, preserving the singleton behavior |
| XCTAssertTrue(null_1 === null_2) |
| |
| //Check that NSNull() == .Some(NSNull) |
| XCTAssertEqual(null_1, null_3) |
| |
| //Make sure that NSNull() != .None |
| XCTAssertNotEqual(null_1, null_4) |
| } |
| |
| func test_description() { |
| XCTAssertEqual(NSNull().description, "<null>") |
| } |
| } |
