public void AnEmptyLibraryWillAlwaysCountZero()
{
// Act
int actual = library.BookCounter();
// Assert
Assert.That(actual, Is.EqualTo(0));
}
/// <summary>
/// Show statistics
/// </summary>
/// <param name="library">The library service.</param>
public static void Statistics(LibraryService library)
{
WriteLine(StatisticsMessage);
WriteLine("\t" + StatisticsBooks + $" {library.BookCounter()}");
}