public void CircleD_TryParse_FailsForInvalidStrings()
        {
            var result    = default(CircleD);
            var succeeded = CircleD.TryParse("foo", out result);

            TheResultingValue(succeeded).ShouldBe(false);
        }
        public void CircleD_TryParse_SucceedsForValidStrings()
        {
            var str    = "123.45 456.78 100.10";
            var result = default(CircleD);

            if (!CircleD.TryParse(str, out result))
            {
                throw new InvalidOperationException("Unable to parse string to CircleD.");
            }

            TheResultingValue(result)
            .ShouldHavePosition(123.45, 456.78)
            .ShouldHaveRadius(100.10);
        }