tests: Reduce test flakiness on macOS

On Linux systems, we use `/proc/$pid/syscall` to wait until the tracked
process is blocked in the `connect` or `accept` call we want to
interrupt. There's no analogous mechanism on macOS, so we just sleep
there. On the GitHub Actions macOS runners, sometimes this delay is not
long enough. Increase it to try to reduce test flakiness.

Signed-off-by: Matt Wozniski <godlygeek@gmail.com>

Author: godlygeek

tests/integration/test_main.py

@@ -82,8 +82,10 @@ def track_and_wait(output_dir, sleep_after=100):
 
 
 def _wait_until_process_blocks(pid: int) -> None:
+    # Sleep longer on GitHub Actions macOS runners to reduce test flakiness
+    default_sleep = 5.0 if "GITHUB_ACTIONS" in os.environ else 1.0
     if "linux" not in sys.platform:
-        time.sleep(1.0)
+        time.sleep(default_sleep)
         return
     # Signal numbers from https://filippo.io/linux-syscall-table/
     arch = platform.machine()
@@ -100,7 +102,7 @@ def _wait_until_process_blocks(pid: int) -> None:
     else:
         # No idea what syscalls numbers to wait on, so we will just
         # sleep for a long enough period and hope for the best
-        time.sleep(1.0)
+        time.sleep(default_sleep)
         return
     syscalls_to_wait = {sleep_syscall, clock_nanosleep, connect_syscall, accept_syscall}
     current_syscall = ""