Just one function of my test class to test the logic of my calculator operations

CalculatorInteractorTestSnippet.swift

// MARK: Frameworks

import XCTest

// MARK: CalculatorInteractorTests

class CalculatorInteractorTests: XCTestCase {
    
    // MARK: Variables
    
    var calculatorInteractor: CalculatorInteractor!

    // MARK: Setup Methods

    override func setUp() {
        super.setUp()

        calculatorInteractor = CalculatorInteractor()
    }
    
    // MARK: Addition Tests

    func testAddition() {
        let numberOne: Float = 4
        let numberTwo: Float = 9
        
        let result = calculatorInteractor.add(numberOne: numberOne, to: numberTwo)

        XCTAssertEqual(result, 13)
    }
}