public void EveryKnockedPinGivesOnePoint(int count)
        {
            BowlingGame sut = CreateSut();

            sut.Roll(count);
            Assert.That(sut.Score(), Is.EqualTo(count));
        }
        public void RollOver10FramesThrowsException()
        {
            for (int i = 0; i < 20; i++)
            {
                bowlingGame.Roll(4);
            }

            var ex = Assert.Throws <Exception>(() => bowlingGame.Roll(4));

            Assert.AreEqual("You cannot roll another ball. Bowling game has been completed!", ex.Message);
        }