public void AddReference_AddReferenceToNUnitFramework_ProjectIsSavedAfterAddingReference()
        {
            CreateTestProject();
            CreateProjectSystem(project);
            project.IsSaved = false;

            string fileName = @"d:\projects\packages\nunit\nunit.framework.dll";

            projectSystem.AddReference(fileName, null);

            Assert.AreEqual(1, project.ItemsWhenSaved.Count);
        }