Make perfetto trace sections for tests more identifiable by prefixing with "test:" and using fully qualified class name.

PiperOrigin-RevId: 853342216

Author: copybara-androidxtest

runner/android_junit_runner/CHANGELOG.md

@@ -8,6 +8,8 @@
 
 **New Features**
 
+* Make perfetto trace sections for tests more identifiable by prefixing with "test:" and using fully qualified class name. (b/204992764)
+
 **Breaking Changes**
 
 **API Changes**

runner/android_junit_runner/java/androidx/test/internal/runner/listener/TraceRunListener.java

@@ -36,7 +36,7 @@ public void testStarted(Description description) throws Exception {
     String testClassName =
         description.getTestClass() != null ? description.getTestClass().getSimpleName() : "None";
     String methodName = description.getMethodName() != null ? description.getMethodName() : "None";
-    Trace.beginSection(sanitizeSpanName(testClassName + "#" + methodName));
+    Trace.beginSection(sanitizeSpanName("test:" + testClassName + "#" + methodName));
   }
 
   @Override

runner/android_junit_runner/javatests/androidx/test/runner/TraceRunListenerTest.java

@@ -52,7 +52,8 @@ public void createsSection_withShortName() throws Exception {
     listener.testFinished(description);
 
     assertThat(ShadowTrace.getCurrentSections()).isEmpty();
-    assertThat(ShadowTrace.getPreviousSections()).containsExactly("ClassUnderTest#theMethodName");
+    assertThat(ShadowTrace.getPreviousSections())
+        .containsExactly("test:ClassUnderTest#theMethodName");
   }
 
   @Test
@@ -72,7 +73,7 @@ public void createsSection_withLongName() throws Exception {
     assertThat(ShadowTrace.getCurrentSections()).isEmpty();
     assertThat(ShadowTrace.getPreviousSections())
         .containsExactly(
-            "ClassUnderTest#anExcessivelyLongDescriptionStringWithLengthAboveThe127CharLimitWillBeTrimmedToAvoidThrowingAnExceptionFromBegin");
+            "test:ClassUnderTest#anExcessivelyLongDescriptionStringWithLengthAboveThe127CharLimitWillBeTrimmedToAvoidThrowingAnExceptionFrom");
   }
 
   private static final class ClassUnderTest {}