void circle_circumference()
{
context["when radius is 1"] = () =>
it["result is 2*pi"] = () =>
target.CircumferenceOfCircle(1)
.ShouldBe(2 * Math.PI);
context["when radius is 5"] = () =>
it["result is 10*pi"] = () =>
target.CircumferenceOfCircle(5)
.ShouldBe(10 * Math.PI);
}
