public async Task CreateNewShouldReturnCollectionWithOneBudgetInIt()
{
var subject = Arrange();
//subject.WriteToDiskMock = (f, d) => { };
SetPrivateBudgetCollection(subject);
var filename = "FooBar.xml";
var collection = await subject.CreateNewAndSaveAsync(filename);
Assert.IsTrue(collection.Count == 1);
}