public void Can_sign_driver_to_team()
{
var team = new Team {Name = "McLaren"};
var driver = new Driver { Name = "Test Driver" };
var season = new Season {Id = 1};
Assert.AreEqual(0, team.Drivers.Count());
var contract = team.SignDriver(driver, season);
Assert.AreEqual(1, team.Drivers.Count());
Assert.IsNotNull(contract);
Assert.AreEqual(team, contract.Team);
}