public void CheckAvailability_ReturnsZero_WhenMaterialNotFound()
 {
     #region ARRANGE
     var materialsService = new MaterialsService(inMemoryDbContext);
     #endregion
     #region ACT
     var materialQuantity = materialsService.CheckAvailability(string.Empty, string.Empty);
     #endregion
     #region ASSERT
     Assert.Equal(0, materialQuantity);
     #endregion
 }