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FloatingBodyTests: the legacy drift table is keyed by the normal's length, not its square

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Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
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Meta Vens 2026-10-07 17:43:08 +02:00
commit 4dea45bb19
1 changed files with 5 additions and 6 deletions
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11
tests/Aetheria.Shared.Tests/FloatingBodyTests.cs
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@ -200,14 +200,13 @@ public sealed class FloatingBodyTests : IDisposable
[Fact]
public void DriftMatchesLegacyFloatingItemsAtSixtyFps()
{
// After 5 s at 60 fps with GravityStrength 1 and force magnitude |f|^2 = m, the legacy GridObject drift
// position (measured by Soul, 2026-10-07, off 3035230b's GridObject.Update): .05 -> 1.7371, .1 -> 7.0012,
// .3 -> 68.55, .5 -> 231.04.
// After 5 s at 60 fps with GravityStrength 1 and a normal of length |f| along x, the legacy GridObject drift
// position (measured by Soul, 2026-10-07, off 3035230b's GridObject.Update): |f| .05 -> 1.7371, .1 -> 7.0012,
// .3 -> 68.55, .5 -> 231.04. The sim steps the same law with exp decay where GridObject used 1 - k dt.
var s = Settings();
foreach (var (m, expected) in new[] { (.05f, 1.7371f), (.1f, 7.0012f), (.3f, 68.55f), (.5f, 231.04f) })
foreach (var (norm, expected) in new[] { (.05f, 1.7371f), (.1f, 7.0012f), (.3f, 68.55f), (.5f, 231.04f) })
{
var f = new float2(sqrt(m), 0);
var body = Run(new KinematicBody(), 5f, 1f / 60f, Zone.GravityAcceleration(f, 1f), s);
var body = Run(new KinematicBody(), 5f, 1f / 60f, Zone.GravityAcceleration(new float2(norm, 0), 1f), s);
Assert.InRange(body.Position.x, expected * .999f, expected * 1.001f);
Assert.Equal(0f, body.Position.y, 4);
}