public void add_statement()
{
var step = new Step(new TcoTask(new MockRootObject(), "SomeTask", "SomeTask"));
var actual = step.AddStatement("_components.Piston.MoveOut().Done");
Assert.AreEqual(1, step.Statements.Count());
Assert.AreEqual("_components.Piston.MoveOut().Done", actual);
Assert.AreEqual("_components.Piston.MoveOut().Done", step.Statements.First());
}