abiaad

extension XCTestCase {
    /// Assert that a `Result` value is in `Success`.
    /// - Parameters:
    ///    - result: input from your test.
    ///    - valueHandler: a closure that returns `Success` value from input. You can assert equality here. Optional.
    func assertSuccess<T, E: Error>(on result: Result<T, E>, valueHandler: ((T) -> Void)? = nil) {
        guard case let .success(value) = result
        else {
            XCTFail("assertSuccess must be success")
            return