public void TestCircularShift()
{
var x = new[] { 1.0, 2, 3, 4, 5, 6, 7, 8 };
var output = Dsp.CircularShift(x, 0).ToReadOnlyList();
FilterAssert.ListsAreEqual(x, output);
output = Dsp.CircularShift(x, -2).ToReadOnlyList();
FilterAssert.ListsAreEqual(new[] { 7, 8, 1.0, 2, 3, 4, 5, 6 }, output);
output = Dsp.CircularShift(x, 2).ToReadOnlyList();
FilterAssert.ListsAreEqual(new[] { 3, 4, 5, 6, 7, 8, 1.0, 2 }, output);
Assert.That(Dsp.CircularShift(new List <double>(), 2).ToReadOnlyList().Count == 0);
Assert.Throws <ArgumentNullException>(() => Dsp.CircularShift <double>(null, 2).ToReadOnlyList());
}