Is it possible to test methods declared as private within a class?

In iOS (Swift/Objective-C), direct testing of private methods is not recommended and usually impossible due to access restrictions. Private methods are intended for internal class implementation and should not be tested directly.

However, there are a few approaches:

1. Test public methods that use private methods — this way, you indirectly verify the logic of private methods.
2. In Swift, you can use @testable import and make methods internal instead of private, so tests can access them.
3. In Objective-C, you can use categories in tests to access private methods.

Example in Swift:

// In the main module
class MyClass {
    private func privateMethod() -> Int {
        return 42
    }
    func publicMethod() -> Int {
        return privateMethod() + 1
    }
}

// In tests
@testable import MyModule

func testPublicMethod() {
    let obj = MyClass()
    XCTAssertEqual(obj.publicMethod(), 43)
}

Thus, it is better to test the class behavior through the public interface rather than directly testing private methods.