public static char RandomBraille(ulong seed, int dots)
{
string s = BrailleByDots[dots % 9];
return(s[RNG.DetermineBounded(seed, s.Length)]);
}
public void TestDetermineBounded()
{
ulong[] states =
{
0UL,
ulong.MinValue,
ulong.MaxValue,
ulong.MaxValue / 2
};
int[] boundaries =
{
int.MaxValue,
int.MinValue,
0,
1,
-1,
2,
-2,
int.MaxValue / 2,
int.MinValue / 2
};
foreach (ulong state in states)
{
for (ulong adding = 0; adding <= 300; adding += 3)
{
foreach (int bound in boundaries)
{
int value = RNG.DetermineBounded(state + adding, bound);
Assert.AreEqual(value, RNG.DetermineBounded(state + adding, bound));
switch (bound)
{
case 0:
Assert.AreEqual(0, value);
break;
case { } _ when bound > 0:
Assert.IsTrue(value >= 0, $"Boundary fail with value {value} and bound {bound}");
Assert.IsTrue(value < bound, $"Boundary fail with value {value} and bound {bound}");
break;
case { } _ when bound < 0:
Assert.IsTrue(value <= 0, $"Boundary fail with value {value} and bound {bound}");
Assert.IsTrue(value > bound, $"Boundary fail with value {value} and bound {bound}");
break;
default:
Assert.Fail($"Untested value: {bound}");
break;
}
}
int sum = 0;
for (ulong i = 0; i < 1000; i++)
{
sum += RNG.DetermineBounded(state + adding + i, -2);
}
Assert.IsTrue(sum <-375 && sum> -625, $"Sum of 1000 calls to DetermineBounded(-2): {sum}");
}
}
}
