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SimRateTests: rounds leave from the shooter's pose at their moment; a zero cooldown fires at the shortest cycle

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soul 2026-10-23 00:50:05 +02:00
commit 2b09e87733
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tests/Aetheria.Shared.Tests/SimRateTests.cs
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@ -301,6 +301,46 @@ public sealed partial class ContactRevealTests
}
}
// Rounds born in one step leave from where the shooter was at their own moment: the origins of two rounds of a step are
// apart by the shooter's velocity times the time between them.
[Fact]
public void RoundsOfOneStepLeaveFromWhereTheShooterWasAtTheirMoment()
{
var dt = 1f / 15f;
var ship = Add(float3(0, 0, 0), new[] { GunWithCooldown(.01f) }, new[] { "Targeting", "Reactor" });
ship.Velocity = float2(30, 0);
var gun = (InstantWeapon) Guns(ship)[0].Behaviors.Single(b => b is InstantWeapon);
var born = new List<(float step, float time, float x, float velocity)>();
gun.OnFire += id =>
{
if (_zone.TryGetShot(id, out var shot)) born.Add((_zone.Time, shot.FireTime, shot.FireOrigin.x, ship.Velocity.x));
};
ship.SetTarget(TargetRef.None);
for (var i = 0; i < 20; i++)
{
gun.Activate();
Tick(dt);
}
var pairs = 0;
for (var i = 1; i < born.Count; i++)
{
if (born[i].step != born[i - 1].step) continue;
pairs++;
var expected = born[i].velocity * (born[i].time - born[i - 1].time);
Assert.True(abs(born[i].x - born[i - 1].x - expected) < 1e-2f, $"round {i}: origins {born[i - 1].x} and {born[i].x}, expected {expected} apart");
}
Assert.True(pairs > 100, $"{pairs} pairs of rounds in one step");
}
// A cooldown of nothing is a gun as fast as the shortest cycle, not a step that never ends.
[Fact]
public void AGunWithNoCooldownFiresAtTheShortestCycle()
{
var ship = Add(float3(0, 0, 0), new[] { GunWithCooldown(0f) }, new[] { "Targeting", "Reactor" });
var rounds = HoldTrigger(ship, Guns(ship)[0], 1f / 30f, 1f);
Assert.True(abs(rounds.Count - 2000f) <= 1.01f, $"{rounds.Count} rounds in 1 s, expected 2000 +-1");
}
// The cluster's cost: a point-defence battery of 0.005 s guns holding its trigger, every round a queued shot with its own
// roll. The step wall time and the heap bytes per round are written beside the test for the report.
[Fact, Trait("Category", "Slow")]