What methods and approaches are used to verify the functioning of individual components of the software product?

Checking the functionality of individual components of a software product in iOS is carried out using the following methods:

• Unit Testing — testing individual classes, functions, or methods using XCTest.
• UI Testing — automated testing of the user interface.
• Integration Testing — testing the interaction of multiple components.
• Using mocks and stubs to isolate components during testing.
• Static code analysis — tools that identify potential errors without running the application.

Example of a simple unit test with XCTest:

import XCTest
@testable import YourApp

class MyComponentTests: XCTestCase {
    func testExample() {
        let component = MyComponent()
        XCTAssertEqual(component.doSomething(), expectedValue)
    }
}