'GreenStream' object has no attribute 'encoding'

[fchauvel]

I'm currently migrating my CAMP application from Python 2.7 to Python 3.5.3 (on Debian 9) and I now get several tests that fail only when I use green (they pass if I run a python setup.py test -s tests.generate.test_samples.

See the logs I get below using green. The output intercepted by Green shows that the z3 module (which we depend on) tried to access the 'encoding' attribute of sys.stdout

$ green -qfvv -d tests.generate.test_samples
2019-04-03 15:31:29     DEBUG Attempting to load target 'tests.generate.test_samples' with file_pattern 'test*.py'
2019-04-03 15:31:30     DEBUG Test case names: ['test_orchestrations', 'test_single_component', 'test_stack', 'test_variables']
2019-04-03 15:31:30     DEBUG Test case names: []
2019-04-03 15:31:30     DEBUG Load method: DOTTED OBJECT - tests.generate.test_samples
2019-04-03 15:31:30     DEBUG Found 4 tests for target 'tests.generate.test_samples'
2019-04-03 15:31:30     DEBUG Sending tests.generate.test_samples to runner <function poolRunner at 0x7f98dae526a8>
2019-04-03 15:31:30     DEBUG Attempting to load target 'tests.generate.test_samples' with file_pattern 'test*.py'
2019-04-03 15:31:30     DEBUG Test case names: ['test_orchestrations', 'test_single_component', 'test_stack', 'test_variables']
2019-04-03 15:31:30     DEBUG Test case names: []
2019-04-03 15:31:30     DEBUG Load method: DOTTED OBJECT - tests.generate.test_samples
2019-04-03 15:31:30     DEBUG Found 4 tests for target 'tests.generate.test_samples'
E

Error in tests.generate.test_samples.FilesAreGenerated.test_orchestrations
  File "/usr/lib/python3.5/unittest/case.py", line 59, in testPartExecutor
    yield
  File "/usr/lib/python3.5/unittest/case.py", line 601, in run
    testMethod()
  File "/home/fchauvel/Documents/camp/tests/generate/test_samples.py", line 108, in test_orchestrations
    self.assert_configuration_count_is(2)
  File "/home/fchauvel/Documents/camp/tests/generate/test_samples.py", line 127, in assert_configuration_count_is
    for each_file in listdir(destination):
FileNotFoundError: [Errno 2] No such file or directory: '/tmp/tmp6ba9wovk/camp_fzcika6m/generate/out'

Captured stdout for tests.generate.test_samples.FilesAreGenerated.test_orchestrations
CAMP v0.3.1 (MIT)
Copyright (C) 2017 -- 2019 SINTEF Digital

Loaded '/tmp/tmp6ba9wovk/camp_fzcika6m/generate/camp.yaml'.
Unexpected error:
 - 'GreenStream' object has no attribute 'encoding'
   In file: /usr/lib/python3.5/z3/z3core.py
      82: enc = sys.stdout.encoding
   Please report this at 'https://github.com/STAMP-project/camp/issues'.

That's all folks!

Captured stderr for tests.generate.test_samples.FilesAreGenerated.test_orchestrations
/home/fchauvel/Documents/camp/camp/generate.py:214: YAMLLoadWarning: calling yaml.load() without Loader=... is deprecated, as the default Loader is unsafe. Please read https://msg.pyyaml.org/load for full details.
  metamodel = load_yaml(data)

Warning: Some tests may not have been run.

Ran 1 test in 0.107s

FAILED (errors=1)

By contrast the tests pass when I do not use green:

$ python setup.py test -s tests.generate.test_samples
running test
running egg_info
writing entry points to camp.egg-info/entry_points.txt
writing camp.egg-info/PKG-INFO
writing dependency_links to camp.egg-info/dependency_links.txt
writing requirements to camp.egg-info/requires.txt
writing top-level names to camp.egg-info/top_level.txt
reading manifest file 'camp.egg-info/SOURCES.txt'
writing manifest file 'camp.egg-info/SOURCES.txt'
running build_ext
test_orchestrations (tests.generate.test_samples.FilesAreGenerated) ... /home/fchauvel/Documents/camp/camp/generate.py:214: YAMLLoadWarning: calling yaml.load() without Loader=... is deprecated, as the default Loader is unsafe. Please read https://msg.pyyaml.org/load for full details.
  metamodel = load_yaml(data)
ok
test_single_component (tests.generate.test_samples.FilesAreGenerated) ... ok
test_stack (tests.generate.test_samples.FilesAreGenerated) ... ok
test_variables (tests.generate.test_samples.FilesAreGenerated) ... ok

----------------------------------------------------------------------
Ran 4 tests in 1.879s

OK

Looking at the past issues, I guess this somehow similar to Issue #146. As explained, the command green -a works as a workaround but it would be nice to be able to capture output :-)

Thanks anyway.

[CleanCut]

Your guess was correct! This was very similar to #146.

I added an encoding attribute to our wrapped sys.stdout that mirrors the value of what we're wrapping. I tested it on your Camp application and it worked for me. The fix is in Green 2.14.2 (just released).

[fchauvel]

Works just fine now! Many thanks for the quick fix!

[CleanCut]

Works just fine now! Many thanks for the quick fix!

You're welcome! It is always nice when the solution is so straightforward. That's fairly rare in my experience. 😄