public void OnBeforeSave_Calls_DocumentLocator(
            [Frozen] IDocumentLocator locator,
            DocumentEventHandler sut,
            uint docCookie)
        {
            sut.OnBeforeSave(docCookie);

            locator
            .Received(1)
            .FindDocument(docCookie);
        }
        public void OnBeforeSave_Calls_DocumentFormatter(
            [Frozen] IDocumentLocator locator,
            [Frozen] IDocumentFormatter formatter,
            DocumentEventHandler sut,
            uint docCookie,
            Document document)
        {
            locator
            .FindDocument(docCookie)
            .Returns(document);

            sut.OnBeforeSave(docCookie);

            formatter
            .Received(1)
            .Format(document);
        }