67 lines
1.9 KiB
C#
67 lines
1.9 KiB
C#
using Age.Engine.Hosting;
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using Xunit;
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public class FrameClockTests
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{
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[Fact]
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public void Advance_AtSpeed1_AddsRealMilliseconds()
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{
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var c = new FrameClock(); // Speed defaults to 1.0
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c.Advance(0.016); // one ~60fps frame
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Assert.Equal(16, c.NowMs);
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}
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[Fact]
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public void Advance_ScalesBySpeed()
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{
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var c = new FrameClock { Speed = 4.0 };
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c.Advance(0.016);
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Assert.Equal(64, c.NowMs); // 4x virtual time
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}
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[Fact]
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public void Advance_RetainsFractionalMillisecondsAtSlowSpeed()
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{
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var c = new FrameClock { Speed = 0.1 };
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for (int i = 0; i < 10; i++) c.Advance(1.0 / 144.0);
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Assert.Equal(6, c.NowMs);
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}
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[Fact]
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public void WallClockPacer_RateDoesNotDependOnRenderCallbackCount()
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{
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static long Simulate(int callbacks)
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{
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var c = new FrameClock();
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var p = new WallClockOpPacer(c);
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long ops = 0;
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p.OpcodeCompleted(); ops++;
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for (int frame = 0; frame < callbacks; frame++)
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{
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c.Advance(1.0 / callbacks);
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while (p.CanRunNext) { p.OpcodeCompleted(); ops++; }
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}
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return ops;
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}
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long at60 = Simulate(60), at144 = Simulate(144), at240 = Simulate(240);
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Assert.InRange(at60, 198, 202);
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Assert.InRange(at144, 198, 202);
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Assert.InRange(at240, 198, 202);
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Assert.InRange(System.Math.Abs(at60 - at144), 0, 2);
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Assert.InRange(System.Math.Abs(at60 - at240), 0, 2);
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}
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[Fact]
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public void WallClockPacer_ResetDropsParkedTimeCredit()
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{
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var c = new FrameClock();
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var p = new WallClockOpPacer(c);
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p.OpcodeCompleted();
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c.Advance(10);
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p.Reset();
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p.OpcodeCompleted();
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Assert.False(p.CanRunNext);
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}
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}
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