public void GetActiveSizes_WhenCalled_ReturnsAllActiveSizesOnly()
        {
            //arrange
            _context
            .Setup(c => c.Get(a => a.IsInactive == false))
            .Returns(() => {
                var result = _sizes.Where(a => a.IsInactive == false).ToList();
                return(result);
            });
            //act
            var result = _sizeService.GetActiveSizes();

            //assert
            Assert.That(result.Count, Is.EqualTo(2));
        }