Crash when trying to load a .so file

[boxed]

I am attempting to use mutpy on tri.struct (I have to use the externalize-test-runner-branch), but I am getting this crash:

> mut.py --runner pytest --target tri.struct --unit-test tests          189ms  Sun Nov 18 15:10:02 2018
[*] Start mutation process:
   - targets: tri.struct
   - tests: tests
[*] 55 tests passed:
   - tests.test_struct [0.36612 s]
[*] Start mutants generation and execution:
Traceback (most recent call last):
  File "/Users/boxed/Projects/tri.struct/venv/bin/mut.py", line 7, in <module>
    exec(compile(f.read(), __file__, 'exec'))
  File "/Users/boxed/Projects/mutpy/bin/mut.py", line 7, in <module>
    commandline.main(sys.argv)
  File "/Users/boxed/Projects/mutpy/mutpy/commandline.py", line 10, in main
    run_mutpy(parser)
  File "/Users/boxed/Projects/mutpy/mutpy/commandline.py", line 62, in run_mutpy
    mutation_controller.run()
  File "/Users/boxed/Projects/mutpy/mutpy/controller.py", line 66, in run
    self.run_mutation_process()
  File "/Users/boxed/Projects/mutpy/mutpy/controller.py", line 85, in run_mutation_process
    self.mutate_module(target_module, to_mutate, total_duration)
  File "/Users/boxed/Projects/mutpy/mutpy/utils.py", line 247, in __call__
    result = self.method(*args, **kwargs)
  File "/Users/boxed/Projects/mutpy/mutpy/controller.py", line 109, in mutate_module
    target_ast = self.create_target_ast(target_module)
  File "/Users/boxed/Projects/mutpy/mutpy/utils.py", line 247, in __call__
    result = self.method(*args, **kwargs)
  File "/Users/boxed/Projects/mutpy/mutpy/controller.py", line 133, in create_target_ast
    return utils.create_ast(target_file.read())
  File "/Users/boxed/Projects/tri.struct/venv/bin/../lib/python3.6/codecs.py", line 321, in decode
    (result, consumed) = self._buffer_decode(data, self.errors, final)
UnicodeDecodeError: 'utf-8' codec can't decode byte 0xca in position 0: invalid continuation byte

I modified the code to print the filename it's trying to read and it's /Users/boxed/Projects/tri.struct/lib/tri/struct/_cstruct.cpython-36m-darwin.so, so that seems pretty wrong. I guess mutpy should only try .py files.

[boxed]

I worked around this by temporarily deleting the cython part of the code base and then it runs. Although 33 mutants seem awfully low hm...

[phihos]

I updated the branch to the current master and I implemented a fix that skips C extensions when mutating modules. Can you verify that it works now?

[boxed]

Yea, that works better. But something is still weird because it ends up saying 100% of mutants survives. You could try this yourself, it's https://github.com/triOptima/tri.struct and the full mutpy run only takes 6 seconds.

[phihos]

I close this issue since the original problem stated in the title is resolved now.