diff --git a/src/cs/Tests/MonoGame.Extended.Tests/Collections/BagTests.cs b/src/cs/Tests/MonoGame.Extended.Tests/Collections/BagTests.cs new file mode 100644 index 00000000..471743de --- /dev/null +++ b/src/cs/Tests/MonoGame.Extended.Tests/Collections/BagTests.cs @@ -0,0 +1,42 @@ +using MonoGame.Extended.Collections; +using System; +using System.Collections.Generic; +using System.Diagnostics; +using System.Runtime.CompilerServices; +using System.Runtime.InteropServices; +using Xunit; + +namespace MonoGame.Extended.Tests.Collections +{ + public class BagTests + { + [Fact] + public void Bag_Enumeration_Does_Not_Allocate() + { + var bag = new Bag(); + for (int i = 0; i < 100; i++) bag.Add(i); + // ensure we have plenty of memory and that the heap only increases for the duration of this test + Assert.True(GC.TryStartNoGCRegion(Unsafe.SizeOf.BagEnumerator>() * 1000)); + var heapSize = GC.GetAllocatedBytesForCurrentThread(); + + // this should NOT allocate + foreach (int i in bag) + { + // assert methods cause the NoGCRegion to fail, so do this manually + if (GC.GetAllocatedBytesForCurrentThread() != heapSize) + Assert.True(false); + } + + // sanity check: this SHOULD allocate + foreach (int _ in (IEnumerable)bag) + { + // assert methods cause the NoGCRegion to fail, so do this manually + if (GC.GetAllocatedBytesForCurrentThread() == heapSize) + Assert.True(false); + } + + GC.EndNoGCRegion(); + } + + } +}