public void AlfaRomeo_ReturnsAString()
{
// Arrange
var controller = new CarController();
// Act
var result = controller.AlfaRomeo();
// Assert
var contentResult = Assert.IsAssignableFrom <ContentResult>(result);
var actual = contentResult.Content;
var expected = "Alfa Romeo is another sport brand. Returned in text.";
Assert.Equal(expected, actual.ToString());
}