public void IndexTest()
{
// Act
var result = controller.Index();
// Assert
Assert.IsInstanceOfType(result, typeof(ViewResult));
ViewResult viewResult = (ViewResult)result;
Assert.IsInstanceOfType(viewResult.ViewData.Model, typeof(List <MaterialModel>));
List <MaterialModel> lista = (List <MaterialModel>)viewResult.ViewData.Model;
Assert.AreEqual(3, lista.Count);
}