testutils/platform: Refactor to be compatible with Python 3.9chandan/py39-platform

Starting from Python 3.9, it seems like the `_replace()` method no
longer works on `platform.uname_result` objects, that are returned by
`platform.uname()`. This causes some of our tests to fail on Python 3.9.
See https://bugs.python.org/issue42163 for upstream issue.

Fix it by slightly changing the way we override the values of the
`platform.uname()` function, such that it works on both Python 3.9 and
3.8 (and below).

1 files changed, 12 insertions, 6 deletions

diff --git a/tests/testutils/platform.py b/tests/testutils/platform.py
index f8faf286e..d8078062a 100644
--- a/tests/testutils/platform.py
+++ b/tests/testutils/platform.py
@@ -17,6 +17,7 @@
 #  Authors:
 #        Angelos Evripiotis <jevripiotis@bloomberg.net>
 
+import collections
 from contextlib import contextmanager
 import platform
 
@@ -32,15 +33,20 @@ import platform
 @contextmanager
 def override_platform_uname(*, system=None, machine=None):
     orig_func = platform.uname
-    result = platform.uname()
+    orig_system, node, release, version, orig_machine, processor = platform.uname()
 
-    if system is not None:
-        result = result._replace(system=system)
-    if machine is not None:
-        result = result._replace(machine=machine)
+    system = system or orig_system
+    machine = machine or orig_machine
 
     def override_func():
-        return result
+        # NOTE:
+        #  1. We can't use `_replace` here because of this bug in
+        #     Python 3.9.0 - https://bugs.python.org/issue42163.
+        #  2. We need to create a new subclass because the constructor of
+        #     `platform.uname_result` doesn't share the same interface between
+        #     Python 3.8 and 3.9.
+        uname_result = collections.namedtuple("uname_result", "system node release version machine processor")
+        return uname_result(system, node, release, version, machine, processor)
 
     platform.uname = override_func
     try: