Handle ambient activities in EventSource test (#56442)

diff --git a/src/libraries/System.Diagnostics.Tracing/tests/BasicEventSourceTest/TestsUserErrors.cs b/src/libraries/System.Diagnostics.Tracing/tests/BasicEventSourceTest/TestsUserErrors.cs
index 58347d9..3073655 100644 (file)
--- a/src/libraries/System.Diagnostics.Tracing/tests/BasicEventSourceTest/TestsUserErrors.cs
+++ b/src/libraries/System.Diagnostics.Tracing/tests/BasicEventSourceTest/TestsUserErrors.cs
@@ -133,7 +133,7 @@ namespace BasicEventSourceTests
             {
                 EventWrittenEventArgs ea = elEvent.Data;
                 Assert.NotNull(ea);
-                Assert.Equal(Guid.Empty, ea.ActivityId);
+                Assert.Equal(EventSource.CurrentThreadActivityId, ea.ActivityId);
                 Assert.Equal(EventChannel.None, ea.Channel);
                 Assert.Equal(0, ea.EventId);
                 Assert.Equal("EventSourceMessage", ea.EventName);