Unable to get started with Mocking using MockSwift.

[azamsharp]

I created a very simple protocol which I want to mock.

protocol CalculatorServiceProtocol {
    func add(a: Int, b: Int) -> Int
}

In my test I write the following:

final class when_user_performs_add_operation_using_calculator: XCTestCase {

    @Mock private var calculatorService: CalculatorServiceProtocol
    
    func test_should_add_successfully() {
       
        // expectation
        given(calculatorService).??? // how to call the add method and return value
        
        }
}

My confusion is that how do I call the add method on the CalculatorServiceProtocol. The .add method never shows up.

[leoture]

Hello!

You need 3 extensions (Mock, Given, Then) as described here https://github.com/leoture/MockSwift#write-mocks.
I suggest you to use Sourcery to generate them.

Result for CalculatorServiceProtocol:

extension Mock: CalculatorServiceProtocol where WrappedType == CalculatorServiceProtocol {
  public func add(a: Int, b: Int) -> Int {
    mocked(a, b)
  }
}

extension Given where WrappedType == CalculatorServiceProtocol {
  public func add(a: Predicate<Int>, b: Predicate<Int>) -> Mockable<Int> {
    mockable(a, b)
  }
  public func add(a: Int, b: Int) -> Mockable<Int> {
    mockable(a, b)
  }
}

extension Then where WrappedType == CalculatorServiceProtocol {
  public func add(a: Predicate<Int>, b: Predicate<Int>) -> Verifiable<Int> {
    verifiable(a, b)
  }
  public func add(a: Int, b: Int) -> Verifiable<Int> {
    verifiable(a, b)
  }
}