The “spare” test should look like this:

    TEST_METHOD(OneSparePlusBonusWorks)
    {
        game.Roll(4);
        game.Roll(6); // spare!
        game.Roll(8);
        RollMany(17, 0);
        Assert::AreEqual(26, game.Score());
    }

And it fails properly: Assert failed. Expected:<26> Actual:<18>.

Let’s write just enough code to pass that test, and then click Next