Initial commit.

PerfectNumbers.Core.Tests/GpuWorkLimiterTests.cs

@@ -0,0 +1,39 @@
+using System.Diagnostics;
+using FluentAssertions;
+using PerfectNumbers.Core.Gpu;
+using Xunit;
+
+namespace PerfectNumbers.Core.Tests;
+
+[Collection("GpuNtt")]
+public class GpuWorkLimiterTests
+{
+    [Fact]
+    [Trait("Category", "Fast")]
+    public async Task Acquire_blocks_when_limit_reached()
+    {
+        GpuWorkLimiter.SetLimit(1);
+
+        var startedSecond = new TaskCompletionSource<bool>();
+        var sw = new Stopwatch();
+
+        using var first = GpuWorkLimiter.Acquire();
+        sw.Start();
+
+        var secondTask = Task.Run(() =>
+        {
+            using var second = GpuWorkLimiter.Acquire();
+            startedSecond.TrySetResult(true);
+        });
+
+        await Task.Delay(50);
+        startedSecond.Task.IsCompleted.Should().BeFalse();
+
+        first.Dispose();
+
+        await secondTask.WaitAsync(TimeSpan.FromSeconds(1));
+        sw.Stop();
+
+        sw.ElapsedMilliseconds.Should().BeGreaterThanOrEqualTo(50);
+    }
+}