public void ska_presentera_antalet_i_text()
{
// Arrange
var _mockSystemOut = new Mock<TextWriter>();
var vy = new AntalFilmerVy(_mockSystemOut.Object);
// Act
vy.Presentera(0);
// Assert
_mockSystemOut.Verify(x => x.WriteLine("Du har inga filmer i samlingen"), Times.Once());
}