public async Task DeletePart() { //Arrange var dbOptions = new DbContextOptionsBuilder <HyperCarsDbContext>() .UseInMemoryDatabase("HyperCarsDb") .Options; var db = new HyperCarsDbContext(dbOptions); var part = new Part { Id = 3, Name = "Test3" }; var partService = new PartService(db); var totalCars = db.Parts.CountAsync(); await db.SaveChangesAsync(); //Act var result = partService.DeletePart(3); //Assert result.Equals(true); }