public async Task AddVehicleModelYearAsync()
{
// Arrange
_context.VehicleMakes.Add(_testModelYear1.Model.Make);
_context.VehicleModels.Add(_testModelYear1.Model);
await _context.SaveChangesAsync();
// Act
var vehicleModelYear = await _vehicleService.AddVehicleModelYearAsync(_testModelYear1);
// Assert
var vehicleModelYearsInDb = await _context.VehicleModelYears.ToListAsync();
Assert.AreEqual(1, vehicleModelYearsInDb.Count);
Assert.AreEqual(_testModelYear1.Model.Make.Name, vehicleModelYearsInDb[0].Model.Make.Name);
Assert.AreEqual(_testModelYear1.Year, vehicleModelYearsInDb[0].Year);
}