Do you have practical experience writing unit tests for code?

Practical experience in writing unit tests for iOS code usually involves using the XCTest framework, which is built into Xcode. Unit tests allow testing individual components of the application (such as classes, methods) in isolation from the rest of the system.

Test cases are created in tests, where the correctness of functions with different input data, error handling, etc., is checked.

An example of a simple test in Swift:

import XCTest
@testable import MyApp

class MyClassTests: XCTestCase {
    func testSum() {
        let myClass = MyClass()
        let result = myClass.sum(a: 2, b: 3)
        XCTAssertEqual(result, 5, "The sum should be 5")
    }
}

This approach helps identify errors early in development and maintain code quality.