@objc protocol MyProtocol {
    
}

class MyClass {
    
}

extension MyClass: MyProtocol {
    
}

class MyClassWithDate {
    var date = Date()
}

extension MyClassWithDate: MyProtocol {
    
}

class MyClassWithDateAndDirectConformance: MyProtocol {
    var date = Date()
}

    func testMyClass() {
        let myClass = MyClass()
        let anyObject: AnyObject = myClass
        XCTAssertTrue(anyObject is MyProtocol) // Passes
        XCTAssertNotNil(anyObject as? MyProtocol) // Passes
    }
    
    func testMyClassWithDate() {
        let myClassWithDate = MyClassWithDate()
        let anyObject: AnyObject = myClassWithDate
        XCTAssertTrue(anyObject is MyProtocol) // Fails
        XCTAssertNotNil(anyObject as? MyProtocol) // Fails
    }
    
    func testMyClassWithDateAndDirectConformance() {
        let myClassWithDateAndDirectConformance = MyClassWithDateAndDirectConformance()
        let anyObject: AnyObject = myClassWithDateAndDirectConformance
        XCTAssertTrue(anyObject is MyProtocol) // Passes
        XCTAssertNotNil(anyObject as? MyProtocol) // Passes
    }