[aDAG] Unflake aDAG + PP tests (#7600)

tests/utils.py

@@ -384,6 +384,7 @@ def fork_new_process_for_each_test(
         os.setpgrp()
         from _pytest.outcomes import Skipped
         pid = os.fork()
+        print(f"Fork a new process to run a test {pid}")
         if pid == 0:
             try:
                 f(*args, **kwargs)
@@ -401,11 +402,11 @@ def fork_new_process_for_each_test(
             pgid = os.getpgid(pid)
             _pid, _exitcode = os.waitpid(pid, 0)
             # ignore SIGTERM signal itself
-            old_singla_handler = signal.signal(signal.SIGTERM, signal.SIG_IGN)
+            old_signal_handler = signal.signal(signal.SIGTERM, signal.SIG_IGN)
             # kill all child processes
             os.killpg(pgid, signal.SIGTERM)
             # restore the signal handler
-            signal.signal(signal.SIGTERM, old_singla_handler)
+            signal.signal(signal.SIGTERM, old_signal_handler)
             assert _exitcode == 0, (f"function {f} failed when called with"
                                     f" args {args} and kwargs {kwargs}")