public void should_add_1_plus_1_correctly()
        {
            Calculator calculator = null;

            Feature.AddScenario()
                .Given("a calculator",                       () => calculator = new Calculator())
                .And("I have entered 1 into the calculator", () => calculator.Enter(1))
                .And("I have entered 1 into the calculator", () => calculator.Enter(1))
                .When("I add the numbers",                   () => calculator.Add())
                .Then("the sum should be  2",                () => calculator.Value().ShouldEqual(2));
        }
 protected void Given_a_calculator()
 {
     _calculator = new Calculator();
 }