test(profiling): improve gevent task testing (#2994)

This tests still fails from time to time because we don't see sleep() or
_nothing() in the last stack: calling gevent sleep might trigger the gevent hub
switch() function which is reported as the last function called.

Nevertheless, _nothing() and/or sleep() are still in the stack trace, which is
what we want. We just need to look deeper.

Author: Julien Danjou

tests/profiling/collector/test_stack.py

@@ -626,13 +626,15 @@ def _nothing():
                 pytest.fail("Task with no name detected, is it the Hub?")
             else:
                 main_thread_found = True
-        elif event.task_id in {t.ident for t in threads} and event.frames[0][2] in (
-            "_nothing",
-            "sleep",
-        ):
-            # Make sure we capture the sleep call and not a gevent hub frame
-            sleep_task_found = True
-
-    # Make sure we did at least one check
-    assert main_thread_found, events
-    assert sleep_task_found, events
+        elif event.task_id in {t.ident for t in threads}:
+            for filename, lineno, funcname in event.frames:
+                if funcname in (
+                    "_nothing",
+                    "sleep",
+                ):
+                    # Make sure we capture the sleep call and not a gevent hub frame
+                    sleep_task_found = True
+                    break
+
+    assert main_thread_found
+    assert sleep_task_found