public void Append_Test()
{
var sut = new Append();
var result = sut.Execute(new int[] { 1, 2, 3, 4, 5 }, 9);
Assert.AreEqual(result[0], 1);
Assert.AreEqual(result[1], 2);
Assert.AreEqual(result[2], 3);
Assert.AreEqual(result[3], 4);
Assert.AreEqual(result[4], 5);
Assert.AreEqual(result[5], 9);
Assert.AreEqual(result.Length, 6);
}
protected override object EvaluateString(string value) => $"{value}{Append.Execute()}";