--- a/testing/mochitest/tests/SimpleTest/SpawnTask.js
+++ b/testing/mochitest/tests/SimpleTest/SpawnTask.js
@@ -267,17 +267,20 @@ var add_task = (function () {
       // Use setTimeout to ensure the master task runs after the client
       // script finishes.
       setTimeout(function () {
         spawn_task(function* () {
           // We stop the entire test file at the first exception because this
           // may mean that the state of subsequent tests may be corrupt.
           try {
             for (var task of task_list) {
+              var name = task.name || "";
+              info("SpawnTask.js | Entering test " + name);
               yield task();
+              info("SpawnTask.js | Leaving test " + name);
             }
           } catch (ex) {
             try {
               ok(false, "" + ex);
             } catch (ex2) {
               ok(false, "(The exception cannot be converted to string.)");
             }
           }