[TestMethod]
public void ICanLoginWithCorrectCredentials()
{
    IApp app = new App();
    ILoginWindow loginPage = new LoginWindow();

    string login = GetTestParameter("login");
    string password = GetTestParameter("password");

    //Step 1
    app.Launch();
    Assert.IsTrue(app.IsLaunched, "App was not launched”);

    //Step 2
    Assert.IsTrue(loginPage.Login(login, password), "Cannot login with given credentials");
}