test(diagnostics): add unit tests to check creation context

For activity tracing.

Author: sgryphon

Diff for: tests/Hangfire.Core.Tests/DiagnosticsActivityFilterFacts.cs

@@ -0,0 +1,83 @@
+#if NET6_0_OR_GREATER
+using System;
+using System.Diagnostics;
+using Hangfire;
+using Moq;
+using Xunit;
+
+namespace Hangfire.Core.Tests
+{
+    public class DiagnosticsActivityFilterFacts
+    {
+        // dotnet test -f net6.0 -l "console;verbosity=detailed" --filter "FullyQualifiedName~Hangfire.Core.Tests.DiagnosticsActivityFilterFacts"
+
+        private readonly CreateContextMock _createContext;
+        private readonly PerformContextMock _performContext;
+
+        public DiagnosticsActivityFilterFacts()
+        {
+            _createContext = new CreateContextMock();
+            _performContext = new PerformContextMock();
+        }
+
+        [Fact]
+        public void OnCreating_WhenActivityIsConfigured_CreationContextIsStored()
+        {
+            // Arrange
+            using var listener = new ActivityListener
+            {
+                ShouldListenTo = _ => true,
+                Sample = (ref ActivityCreationOptions<ActivityContext> _) => ActivitySamplingResult.AllData,
+                ActivityStarted = activity => {},
+                ActivityStopped = activity => {}
+            };
+            ActivitySource.AddActivityListener(listener);
+
+            var testActivity = new Activity("test");
+            testActivity.Start();
+            var expectedTraceId = testActivity.TraceId.ToHexString();
+
+            var filter = CreateFilter();
+
+            // Act
+            filter.OnCreating(_createContext.GetCreatingContext());
+
+            // Assert
+            Assert.Equal(((string)_createContext.Object.Parameters["traceparent"]).Substring(3,32), expectedTraceId);
+        }
+
+        [Fact]
+        public void OnPerforming_WhenActivityParametersExist_CreationContextIsUsed()
+        {
+            // Arrange
+            using var listener = new ActivityListener
+            {
+                ShouldListenTo = _ => true,
+                Sample = (ref ActivityCreationOptions<ActivityContext> _) => ActivitySamplingResult.AllData,
+                ActivityStarted = activity => {},
+                ActivityStopped = activity => {}
+            };
+            ActivitySource.AddActivityListener(listener);
+
+            var expectedTraceId = "abcdef0123456789abcdef0123456789";
+            var traceParent = $"00-{expectedTraceId}-123456789abcdef0-01";
+            _performContext.Connection
+                .Setup(x => x.GetJobParameter(_performContext.BackgroundJob.Id, "traceparent"))
+                .Returns($"\"{traceParent}\"");
+
+            var filter = CreateFilter();
+
+            // Act
+            filter.OnPerforming(_performContext.GetPerformingContext());
+
+            // Assert
+            Assert.Equal(Activity.Current.TraceId.ToHexString(), expectedTraceId);
+        }
+
+        private DiagnosticsActivityFilter CreateFilter()
+        {
+            return new DiagnosticsActivityFilter();
+        }
+    }
+}
+#endif