Merge ~sylvain-pineau/checkbox-ng:remove_test_pod_namedtuple_internals into checkbox-ng:master

[Sylvain Pineau]

Fixes the focal builds by removing a check on namedtuple internals:

======================================================================
FAIL: test_namedtuple_cls (plainbox.impl.test_pod.PODTests)
Check that .namedtuple_cls is set up by PODMeta.
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/<<BUILDDIR>>/checkbox-ng-1.6.0+git201911251424+pkg137~ubuntu20.04.1/plainbox/impl/test_pod.py", line 307, in test_namedtuple_cls
    self.assertIsInstance(T.namedtuple_cls.f1, property)
AssertionError: <_collections._tuplegetter object at 0x7fec3bcd22e0> is not an instance of <class 'property'>

----------------------------------------------------------------------
Ran 1758 tests in 14.210s

FAILED (failures=1, expected failures=2)
Test failed: <unittest.runner.TextTestResult run=1758 errors=0 failures=1>
error: Test failed: <unittest.runner.TextTestResult run=1758 errors=0 failures=1>
E: pybuild pybuild:341: test: plugin distutils failed with: exit code=1: python3.8 setup.py test

[Sylvain Pineau (sylvain-pineau)]

self-approved

review: Approve

diff --git a/plainbox/impl/test_pod.py b/plainbox/impl/test_pod.py
index 02e9262..5f0ae9c 100644
--- a/plainbox/impl/test_pod.py
+++ b/plainbox/impl/test_pod.py
@@ -304,9 +304,6 @@ class PODTests(TestCase):
             f3 = Field(initial_fn=lambda: m())
 
         self.assertEqual(T.namedtuple_cls.__name__, 'T')
-        self.assertIsInstance(T.namedtuple_cls.f1, property)
-        self.assertIsInstance(T.namedtuple_cls.f2, property)
-        self.assertIsInstance(T.namedtuple_cls.f3, property)
 
     def test_initializer_positional_arguments(self):
         """.__init__() works correctly with positional arguments."""