TestBridging.swift

// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2017 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 NS_FOUNDATION_ALLOWS_TESTABLE_IMPORT
#if canImport(SwiftFoundation) && !DEPLOYMENT_RUNTIME_OBJC
@testableimport SwiftFoundation
#else
@testableimport Foundation
#endif
#endif

structStructWithDescriptionAndDebugDescription:
CustomStringConvertible,CustomDebugStringConvertible
{
vardescription:String{"description"}
vardebugDescription:String{"debugDescription"}
}

classTestBridging:XCTestCase{
func testBridgedDescription()throws{
#if canImport(Foundation) && canImport(SwiftFoundation)
 /*
 Do not test this on Darwin.
 On systems where swift-corelibs-foundation is the Foundation module,
 the stdlib gives us the ability to specify how bridging works
 (by using our __SwiftValue class), which is what we're testing
 here when we do 'a as AnyObject'. But on Darwin, bridging is out
 of SCF's hands — there is an ObjC __SwiftValue class vended by
 the runtime.
 Deceptively, below, when we say 'NSObject', we mean SwiftFoundation.NSObject,
 not the ObjC NSObject class — which is what __SwiftValue actually
 derives from. So, as? NSObject below returns nil on Darwin.
 Since this functionality is tested by the stdlib tests on Darwin,
 just skip this test here.
 */
#else
 // Struct with working (debug)description properties:
leta=StructWithDescriptionAndDebugDescription()
XCTAssertEqual("description", a.description)
XCTAssertEqual("debugDescription", a.debugDescription)

 // Wrap it up in a SwiftValue container
letb=(a asAnyObject)as?NSObject
XCTAssertNotNil(b)
letc=tryXCTUnwrap(b)

 // Check that the wrapper forwards (debug)description
 // to the wrapped description property.
XCTAssertEqual("description", c.description)
XCTAssertEqual("description", c.debugDescription)
#endif
}

func testDynamicCast()throws{
 // Covers https://github.com/apple/swift-corelibs-foundation/pull/2500
classTestClass{}
letanyArray:Any=[TestClass()]
XCTAssertNotNil(anyArray as?NSObject)
}

func testConstantsImmortal()throws{
func release(_ ptr:UnsafeRawPointer, count:Int){
letobject:Unmanaged<NSNumber>=Unmanaged.fromOpaque(ptr)
for_in0..<count {
 object.release()
}
}

lettrueConstant=NSNumber(value:true)
letfalseConstant=NSNumber(value:false)

 // To accurately read the whole refcount, we need to read the second
 // word of the pointer.
lettruePtr=unsafeBitCast(trueConstant, to: UnsafePointer<Int>.self)
letfalsePtr=unsafeBitCast(falseConstant, to: UnsafePointer<Int>.self)

lettrueRefCount= truePtr.advanced(by:1).pointee
letfalseRefCount= falsePtr.advanced(by:1).pointee

XCTAssertEqual(trueRefCount, falseRefCount)

release(truePtr, count:5)
release(falsePtr, count:5)

XCTAssertEqual(trueRefCount, truePtr.advanced(by:1).pointee)
XCTAssertEqual(falseRefCount, falsePtr.advanced(by:1).pointee)
}
}