public void BikeRace_Ride_CallsRideOnCompetitor()
{
// Arrange
Mock <IBikeRace> mockRace = new Mock <IBikeRace>();
Mock <Competitor> mockCompetitor = new Mock <Competitor>();
mockRace.Setup(x => x.GetCompetitor(It.IsAny <BikeType>())).Returns(mockCompetitor.Object);
Competitor competitor = mockRace.Object.GetCompetitor(BikeType.Hybrid);
// Act
competitor.Ride();
// Assert
mockCompetitor.Verify(m => m.Ride(), Times.Once);
}