Initial commit: Theriapolis baseline at port/godot branch point

Captures the pre-Godot-port state of the codebase. This is the rollback anchor for the Godot port (M0 of theriapolis-rpg-implementation-plan-godot-port.md). All Phase 0 through Phase 6.5 work is included; Phase 7 is in flight. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
2026-04-30 20:40:51 -07:00
commit b451f83174
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+using Theriapolis.Core.World.Generation;
+using Xunit;
+
+namespace Theriapolis.Tests.Determinism;
+
+/// <summary>
+/// Phase 1 determinism contract:
+/// seed 0xCAFEBABE run twice → byte-identical elevation, moisture, temperature,
+/// and biome arrays.
+///
+/// Uses variant 0 and variant 1 so the WorldCache fixture returns two
+/// independent pipeline runs of the same seed (otherwise comparing the cached
+/// context against itself would prove nothing).
+/// </summary>
+public sealed class WorldgenDeterminismTests : IClassFixture<WorldCache>
+{
+    private const ulong TestSeed = 0xCAFEBABEUL;
+    private readonly WorldCache _cache;
+
+    public WorldgenDeterminismTests(WorldCache cache) => _cache = cache;
+
+    [Fact]
+    public void SameSeed_ProducesIdenticalElevation()
+    {
+        var h1 = _cache.Get(TestSeed, variant: 0).World.HashElevation();
+        var h2 = _cache.Get(TestSeed, variant: 1).World.HashElevation();
+        Assert.Equal(h1, h2);
+    }
+
+    [Fact]
+    public void SameSeed_ProducesIdenticalMoisture()
+    {
+        var h1 = _cache.Get(TestSeed, variant: 0).World.HashMoisture();
+        var h2 = _cache.Get(TestSeed, variant: 1).World.HashMoisture();
+        Assert.Equal(h1, h2);
+    }
+
+    [Fact]
+    public void SameSeed_ProducesIdenticalTemperature()
+    {
+        var h1 = _cache.Get(TestSeed, variant: 0).World.HashTemperature();
+        var h2 = _cache.Get(TestSeed, variant: 1).World.HashTemperature();
+        Assert.Equal(h1, h2);
+    }
+
+    [Fact]
+    public void SameSeed_ProducesIdenticalBiomes()
+    {
+        var h1 = _cache.Get(TestSeed, variant: 0).World.HashBiomes();
+        var h2 = _cache.Get(TestSeed, variant: 1).World.HashBiomes();
+        Assert.Equal(h1, h2);
+    }
+
+    [Fact]
+    public void DifferentSeeds_ProduceDifferentElevation()
+    {
+        var h1 = _cache.Get(TestSeed).World.HashElevation();
+        var h2 = _cache.Get(TestSeed + 1).World.HashElevation();
+        Assert.NotEqual(h1, h2);
+    }
+}