public void DocumentShouldBeSaved()
{
// Arrange
var doc = new OfficeDocument(this.sourceFile);
var viewModel = new OfficeDocumentViewModel(doc);
viewModel.InsertPart(XmlParts.RibbonX12);
Assume.That(File.Exists(this.destFile), Is.False, "File was not deleted before test");
// Act
doc.Save(this.destFile);
// Assert
Assert.IsTrue(File.Exists(this.destFile), "File was not saved");
}