public void AddUnit_ShouldReturn_Success()
        {
            // Arrange
            UnitsModel unit = new UnitsModel {
                Name = "g", Notes = "gram"
            };

            fakeUnitsRepository.Setup(a => a.Add(unit));
            unitsService = new UnitsService(fakeUnitsRepository.Object);

            try
            {
                // Act
                unitsService.AddUnit(new UnitsDtoModel {
                    Name = unit.Name, Notes = unit.Notes
                });
                operationSucceeded = true;
            }
            catch (Exception ex)
            {
                errorMessage = ex.Message + " | " + ex.StackTrace;
            }

            // Assert
            Assert.IsTrue(operationSucceeded, errorMessage);
        }