fix(tests): make test_get_platform less flaky (#2040)

tests/test_client.py

@@ -6,6 +6,7 @@
 import os
 import sys
 import json
+import time
 import asyncio
 import inspect
 import subprocess
@@ -1797,10 +1798,20 @@ async def test_main() -> None:
             [sys.executable, "-c", test_code],
             text=True,
         ) as process:
-            try:
-                process.wait(2)
-                if process.returncode:
-                    raise AssertionError("calling get_platform using asyncify resulted in a non-zero exit code")
-            except subprocess.TimeoutExpired as e:
-                process.kill()
-                raise AssertionError("calling get_platform using asyncify resulted in a hung process") from e
+            timeout = 10  # seconds
+
+            start_time = time.monotonic()
+            while True:
+                return_code = process.poll()
+                if return_code is not None:
+                    if return_code != 0:
+                        raise AssertionError("calling get_platform using asyncify resulted in a non-zero exit code")
+
+                    # success
+                    break
+
+                if time.monotonic() - start_time > timeout:
+                    process.kill()
+                    raise AssertionError("calling get_platform using asyncify resulted in a hung process")
+
+                time.sleep(0.1)