40 lines
1.8 KiB
C#
40 lines
1.8 KiB
C#
using System;
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using NUnit.Framework;
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using SVSim.BattleEngine.Rng;
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namespace SVSim.BattleEngine.Tests
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{
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[TestFixture]
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public class RngSeamTests
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{
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// RandomSourceBridge.Range must mirror the engine's exact roll arithmetic:
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// BattleManagerBase.StableRandom does `(int)Math.Floor((double)val * unit)`.
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[Test]
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public void Bridge_Range_mirrors_engine_floor_arithmetic()
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{
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Assert.That(RandomSourceBridge.Range(7, 0.0), Is.EqualTo(0)); // floor(7*0) = 0
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Assert.That(RandomSourceBridge.Range(7, 0.999), Is.EqualTo(6)); // floor(6.993) = 6 (never == val)
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Assert.That(RandomSourceBridge.Range(3, 0.5), Is.EqualTo(1)); // floor(1.5) = 1 (middle of 3)
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Assert.That(RandomSourceBridge.Range(1, 0.5), Is.EqualTo(0)); // floor(0.5) = 0
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}
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// SeededRandomSource(seed) must reproduce the engine's own generators EXACTLY: BattleManagerBase
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// seeds both _stableRandom and _stableRandomOnlySelf as `new System.Random(RandomSeed)`
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// (BattleManagerBase.cs:721-722). NextUnit() == synced.NextDouble(); NextSelf(max) == self.Next(max).
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[Test]
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public void SeededSource_reproduces_two_System_Random_streams()
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{
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const int seed = 12345;
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var src = new SeededRandomSource(seed);
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var refSynced = new System.Random(seed); // mirrors _stableRandom
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var refSelf = new System.Random(seed); // mirrors _stableRandomOnlySelf (separate stream)
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for (int i = 0; i < 8; i++)
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Assert.That(src.NextUnit(), Is.EqualTo(refSynced.NextDouble()), $"NextUnit drift at {i}");
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for (int i = 0; i < 8; i++)
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Assert.That(src.NextSelf(100), Is.EqualTo(refSelf.Next(100)), $"NextSelf drift at {i}");
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}
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}
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}
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