private void AddCaseForFiltersExcept([NotNull] TestCasesBuilder builder)
            {
                NotifyFilters union  = GetUnionForFilters();
                NotifyFilters except = ~union & TestNotifyFilters.All;

                builder.Add(except, "");
            }
            private void AddCasesForSingleFilter([NotNull] TestCasesBuilder builder)
            {
                int bitmask = 1;

                NotifyFilters filters = GetUnionForFilters();

                while (filters != 0)
                {
                    var currentFilter = (NotifyFilters)bitmask;

                    if (filters.HasFlag(currentFilter))
                    {
                        builder.Add(currentFilter, GetExpectedTextForFilters(currentFilter));
                        filters &= ~currentFilter;
                    }

                    bitmask = bitmask << 1;
                }
            }
            private void AddCaseForAllFilters([NotNull] TestCasesBuilder builder)
            {
                string expectedText = GetExpectedTextForFilters(TestNotifyFilters.All);

                builder.Add(TestNotifyFilters.All, expectedText);
            }