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Test that Substitute carries params, constants and picks

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Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Meta Vens 2026-10-14 06:40:09 +02:00
commit 0a4a14dd5e
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37
packages/cultmath/tests/CultMath.Tests/ExprTests.cs
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@ -268,6 +268,43 @@ public sealed class ExprTests
Assert.Equal("bare-multi-result", Assert.Throws<ExprGraphException>(() => d.Substitute(field, new Dictionary<string, ExprValue> { ["x"] = cell })).Rule);
}
[Fact]
public void SubstituteCarriesParamsConstantsAndPicks()
{
// o = p * k + cellular(p, p, k).edge.w - 0.5, with k a param of default 0.25.
var g = new ExprBuilder();
var gp = g.Input("p");
var gk = g.Param("k", 0.25f);
var cell = g.Call("cellular3", gp, gp, gk);
g.Output("o", g.Call("sub", g.Call("add", g.Call("mul", gp, gk), g.Pick(cell, 7)), g.Const(0.5f)));
var graph = g.Build();
var b = new ExprBuilder();
var shifted = b.Call("add", b.Input("x"), b.Const(1.5f));
b.Output("o", b.Substitute(graph, new Dictionary<string, ExprValue> { ["p"] = shifted })["o"]);
var rebuilt = b.Build();
Assert.Equal(new[] { "x" }, rebuilt.InputNames);
Assert.Equal(graph.ParamNames, rebuilt.ParamNames);
Assert.Equal(graph.ParamDefaultBits, rebuilt.ParamDefaultBits);
var x = Column(new System.Random(3), 512, -5f, 5f, 0.1);
foreach (var k in new[] { 0.25f, 0.9f })
{
var expected = x.Select(v =>
{
var p = v + 1.5f;
return p * k + cellular(new float3(p, p, k)).edge.w - 0.5f;
}).ToArray();
var bindings = ExprBindings.Bind(rebuilt, new Dictionary<string, float> { ["k"] = k });
AssertSame(expected, Run(rebuilt, bindings, x), 0, "substituted graph, k=" + k);
}
// A param met again with other default bits is a conflict, not a silent pick.
var c = new ExprBuilder();
c.Param("k", 0.5f);
Assert.Equal("port-conflict", Refusal(() => c.Substitute(graph, new Dictionary<string, ExprValue>())).Rule);
}
private static string Signature(ExprGraph g) =>
string.Join(";", g.InputNames) + "|" + string.Join(";", g.ParamNames.Zip(g.ParamDefaultBits, (n, v) => n + "=" + v)) + "|" +
string.Join(";", g.OutputNames.Zip(g.OutputNodes, (n, v) => n + "=" + v)) + "|" +