public async Task ManufacturerService_Should_Update_Manufacturer() { // Arrange SetUpUnitOfWork(); var service = new ManufacturerService(_unitOfWork.Object, _mapper); var entity = new ManufacturerDTO() { Name = "TestName", }; var newEntity = new ManufacturerDTO() { Name = "NewTestName", }; await service.CreateAsync(entity); await _unitOfWork.Object.SaveAsync(); // Act entity.Name = newEntity.Name; await service.UpdateAsync(entity); await _unitOfWork.Object.SaveAsync(); // Assert Assert.NotNull(entity); Assert.Equal(newEntity.Name, entity.Name); }