class LoginViewModelTests: XCTestCase {

    var viewModel: LoginViewModel!
    var disposeBag: DisposeBag? = DisposeBag()

    override func setUp() {
        super.setUp()
        disposeBag = DisposeBag()
    }

    func testButtonIsDisabled() {
        viewModel = LoginViewModel(
            input: (
                username: Observable.just("A"),
                password: Observable.just("BC")
            )
        )

        viewModel.signInButtonEnabled
            .subscribeNext {
                XCTAssertFalse($0)
        }
        .addDisposableTo(disposeBag)
    }

    func testButtonIsEnabled() {
        viewModel = LoginViewModel(
            input: (
                username: Observable.just("A"),
                password: Observable.just("BCDE")
            )
        )

        viewModel.signInButtonEnabled
            .subscribeNext {
                XCTAssertTrue($0)
        }
        .addDisposableTo(disposeBag)
    }

    override func tearDown() {
        super.tearDown()
        disposeBag = nil
    }
}