public void TestRandomSeed()
{
// since it's random; these != 0 checks MAY THEORETICALLY fail; but the risk should be 1 in uint.maxvalue
var a = RandomSeed.GetUInt32();
Assert.IsTrue(a != 0);
var b = RandomSeed.GetUInt64();
Assert.IsTrue(b != 0);
var expanded = RandomSeed.ExpandSeed(123);
Assert.IsTrue((expanded & 0b11111111_11111111_11111111_11111111_00000000_00000000_00000000_00000000ul) != 0);
}
public void TestDataWriter2()
{
ulong ss = RandomSeed.GetUInt64();
byte[] small = new byte[64];
using (var wrt = new DataWriter(1))
{
for (int runs = 0; runs < 10000; runs++)
{
wrt.Clear();
var originalSeed = PRNG.NextUInt64(ref ss);
var seed = originalSeed;
{
int numOps = PRNG.Next(ref seed, 1, 15);
for (int o = 0; o < numOps; o++)
{
switch (PRNG.Next(ref seed, 0, 6))
{
case 0:
wrt.WriteBool(PRNG.NextBool(ref seed));
break;
case 1:
wrt.WriteSingle((float)PRNG.Next(ref seed, 1, 100));
break;
case 2:
wrt.WriteVariableInt32(PRNG.Next(ref seed, -50, 50));
break;
case 3:
wrt.WriteString(PRNG.NextUInt32(ref seed).ToString());
break;
case 4:
wrt.WriteUInt16((ushort)PRNG.Next(ref seed, 0, ushort.MaxValue));
break;
case 5:
var sss = small.AsSpan(0, PRNG.Next(ref seed, 1, 25));
wrt.WriteBytes(sss);
break;
}
}
}
// read
var rdr = wrt.ReadOnlySpan;
seed = originalSeed;
{
int numOps = PRNG.Next(ref seed, 1, 15);
for (int o = 0; o < numOps; o++)
{
switch (PRNG.Next(ref seed, 0, 6))
{
case 0:
{
var facit = PRNG.NextBool(ref seed);
Assert.AreEqual(facit, rdr.ReadBool());
}
break;
case 1:
{
var facit = (float)PRNG.Next(ref seed, 1, 100);
Assert.AreEqual(facit, rdr.ReadSingle());
}
break;
case 2:
{
var facit = PRNG.Next(ref seed, -50, 50);
Assert.AreEqual(facit, rdr.ReadVariableInt32());
}
break;
case 3:
{
var facit = PRNG.NextUInt32(ref seed).ToString();
Assert.AreEqual(facit, rdr.ReadString());
}
break;
case 4:
{
var facit = (ushort)PRNG.Next(ref seed, 0, ushort.MaxValue);
Assert.AreEqual(facit, rdr.ReadUInt16());
}
break;
case 5:
{
var sss = small.AsSpan(0, PRNG.Next(ref seed, 1, 25));
var aaa = rdr.ReadBytes(sss.Length);
Assert.IsTrue(sss.SequenceEqual(aaa));
}
break;
}
}
}
}
}
}
public void Test7BitEncoding()
{
byte[] arr = new byte[1024];
// test variable lengths
var numbers = new ulong[7];
numbers = new ulong[] { 1, 25, 137, 255, 256, 10000, 1000000 };
ulong state = RandomSeed.GetUInt64();
for (int runs = 0; runs < 250000; runs++)
{
var work = arr.AsSpan();
for (int i = 0; i < numbers.Length; i++)
{
work.WriteVariableUInt64(numbers[i]);
}
int resultLength = arr.Length - work.Length;
ReadOnlySpan <byte> res = arr.AsSpan(0, resultLength);
for (int i = 0; i < numbers.Length; i++)
{
var nr = res.ReadVariableUInt64();
Assert.AreEqual(numbers[i], nr);
}
// re-randomize
numbers[0] = (ulong)PRNG.Next(ref state, 0, 6);
numbers[1] = (ulong)PRNG.Next(ref state, 7, 300);
numbers[2] = (ulong)PRNG.Next(ref state, 300, 5000);
numbers[3] = (ulong)PRNG.Next(ref state, 5000, 50000);
numbers[4] = (ulong)PRNG.Next(ref state, 50000, 500000);
numbers[5] = (ulong)PRNG.NextUInt64(ref state);
numbers[6] = (ulong)PRNG.NextUInt64(ref state);
}
// signed
var signed = new long[7];
for (int runs = 0; runs < 250000; runs++)
{
// re-randomize
signed[0] = (long)PRNG.Next(ref state, -5, 5);
signed[1] = (long)PRNG.Next(ref state, -100, 100);
signed[2] = (long)PRNG.Next(ref state, -300, 300);
signed[3] = (long)PRNG.Next(ref state, -5000, 5000);
signed[4] = (long)PRNG.Next(ref state, -70000, 70000);
signed[5] = (long)PRNG.NextUInt64(ref state);
signed[6] = (long)PRNG.NextUInt64(ref state);
var work = arr.AsSpan();
for (int i = 0; i < signed.Length; i++)
{
work.WriteVariableInt64(signed[i]);
}
int resultLength = arr.Length - work.Length;
ReadOnlySpan <byte> res = arr.AsSpan(0, resultLength);
for (int i = 0; i < signed.Length; i++)
{
var nr = res.ReadVariableInt64();
Assert.AreEqual(signed[i], nr);
}
}
}
public void TestPRNG()
{
const int iterations = 5000000;
Console.WriteLine();
int trues = 0;
int larger = 0;
int smaller = 0;
for (int i = 0; i < iterations; i++)
{
if (PRNG.NextBool())
{
trues++;
}
int val = PRNG.Next(5, 8); // 5, 6 or 7
switch (val)
{
case 5:
smaller++;
break;
case 6:
break;
case 7:
larger++;
break;
default:
Assert.Fail("Value " + val + " isn't 5, 6 or 7");
break;
}
// ranged
var r1 = (int)PRNG.NextUInt32();
var r2 = (int)PRNG.NextUInt32();
if (r1 < r2)
{
var rr = PRNG.Next(r1, r2);
Assert.IsTrue(rr >= r1 && rr < r2, rr.ToString() + " is not between " + r1 + " and " + r2);
}
else if (r1 > r2)
{
var rr = PRNG.Next(r2, r1);
Assert.IsTrue(rr >= r2 && rr < r1, rr.ToString() + " is not between " + r2 + " and " + r1);
}
}
var p = (double)trues / (double)iterations;
Assert.IsTrue(p > 0.495 && p < 0.505);
const double third = 1.0 / 3.0;
const double offset = third * 0.05;
const double low = third - offset;
const double high = third + offset;
p = (double)smaller / (double)iterations;
Assert.IsTrue(p > low && p < high);
p = (double)larger / (double)iterations;
Assert.IsTrue(p > low && p < high);
// make sure nextdouble() and nextfloat() don't generate numbers outside range
var state = RandomSeed.GetUInt64();
for (int r = 0; r < 10000000; r++)
{
double d = PRNG.NextDouble(ref state);
Assert.IsTrue(d >= 0.0 && d < 1.0);
float f = PRNG.NextFloat(ref state);
Assert.IsTrue(f >= 0.0f && f < 1.0f);
}
}
