public async Task TotalParts()
{
//Arrange
var dbOptions = new DbContextOptionsBuilder <HyperCarsDbContext>()
.UseInMemoryDatabase("HyperCarsDb")
.Options;
var db = new HyperCarsDbContext(dbOptions);
var partService = new PartService(db);
await db.SaveChangesAsync();
//Act
var result = partService.Total();
//Assert
result.Equals(db.Parts.CountAsync());
}