public void Given_100And1000_ReturnsCountOf12() => Generating.GetStrobogrammaticNumbers("100", "1000").Should().Be(12);
 public void Given_0And1_ReturnsCountOf2() => Generating.GetStrobogrammaticNumbers("0", "1").Should().Be(2);
 public void Given_0And25_ReturnsCountOf4() => Generating.GetStrobogrammaticNumbers("0", "25").Should().Be(4);
 public void Given_0And0_ReturnsCountOf1() => Generating.GetStrobogrammaticNumbers("0", "0").Should().Be(1);