public void TestProcessAction()
{
//Arrange
Stack <double> myStack = new Stack <double>();
myStack.Push(1);
myStack.Push(2);
var data = A.Fake <IDataHolder <double> >();
var calc = A.Fake <ICalculatorFunctions>();
A.CallTo(() => data.RemoveElement()).Invokes(() => myStack.Pop()).Returns(myStack.Peek());
A.CallTo(() => data.InsertElement(A <double> .Ignored)).Invokes(() => myStack.Push(3));
WCFCalculatorImpl service = new WCFCalculatorImpl(data, calc);
//Act
service.ProcessAction("+");
//Assert
Assert.AreEqual(1, myStack.Count);
Assert.AreEqual(3, myStack.Peek());
}
