public void FilterTocs(TocFilter tocFilter, int expected)
{
var source = ComesFromSource;
((CifSchedule)source[0].Service.Details).Operator = new Toc("GR");
((CifSchedule)source[1].Service.Details).Operator = new Toc("VT");
((CifSchedule)source[2].Service.Details).Operator = new Toc("VT");
((CifSchedule)source[3].Service.Details).Operator = new Toc("SW");
var filter = Factory.ProvidedByToc(tocFilter, Factory.NoFilter);
var results = filter(source).ToArray();
Assert.Equal(expected, results.Length);
}