feat(html-report): omit redundant test body span from trace timeline

TUnit.Core/TUnitActivitySource.cs

@@ -16,6 +16,7 @@ internal static class TUnitActivitySource
     internal const string SpanTestAssembly = "test assembly";
     internal const string SpanTestSuite = "test suite";
     internal const string SpanTestCase = "test case";
+    internal const string SpanTestBody = "test body";
 
     // Tag keys used across init/dispose spans and the HTML report.
     internal const string TagTestId = "tunit.test.id";

TUnit.Engine/Reporters/Html/HtmlReportGenerator.cs

@@ -1485,8 +1485,15 @@ function gd(s) {
 function renderTrace(tid, rootSpanId) {
     const allSpans = spansByTrace[tid];
     if (!allSpans || !allSpans.length) return '';
-    const sp = getDescendants(allSpans, rootSpanId);
+    let sp = getDescendants(allSpans, rootSpanId);
     if (!sp.length) return '';
+    // 'test body' must match TUnitActivitySource.SpanTestBody in C#
+    const directChildren = sp.filter(s => s.parentSpanId === rootSpanId);
+    if (directChildren.length === 1 && directChildren[0].name === 'test body') {
+        const tbId = directChildren[0].spanId;
+        sp = sp.filter(s => s.spanId !== tbId).map(s => s.parentSpanId === tbId ? {...s, parentSpanId: rootSpanId} : s);
+    }
+    if (sp.length <= 1) return '';
     // Include the parent suite span so the test bar is shown relative to the class duration
     const root = bySpanId[rootSpanId];
     if (root && root.parentSpanId && bySpanId[root.parentSpanId]) {

TUnit.Engine/TestExecutor.cs

@@ -166,7 +166,7 @@ await _eventReceiverOrchestrator.InvokeFirstTestInClassEventReceiversAsync(
             if (TUnitActivitySource.Source.HasListeners())
             {
                 testBodyActivity = TUnitActivitySource.StartActivity(
-                    "test body",
+                    TUnitActivitySource.SpanTestBody,
                     ActivityKind.Internal,
                     executableTest.Context.Activity?.Context ?? default);
             }