Mutant not killed due to module import issue

Example of how importing modules under different names allows mutations to survive. In this case the problem is related to how Cosmic-Ray loads the mutated modules. It has already been fixed in PR #158.


$ pip install
$ celery -A cosmic_ray.tasks.worker worker

$ cosmic-ray run --baseline=10 example.json sandwich/ham/ -- tests
$ cosmic-ray report example.json
job ID 1:Outcome.SURVIVED:sandwich.ham.ham
command: cosmic-ray worker sandwich.ham.ham number_replacer 0 unittest -- tests
--- mutation diff ---
--- a/sandwich/ham/
+++ b/sandwich/ham/
@@ -3,6 +3,6 @@

 class Ham(object):

-    def __init__(self, pieces=10):
+    def __init__(self, pieces=11):
         self.pieces = pieces

total jobs: 1
complete: 1 (100.00%)
survival rate: 100.00%


In this example properly kills the mutant once the above issue is fixed.

Source code

class Ham(object):
    def __init__(self, pieces=10):
        self.pieces = pieces
from sandwich.ham import ham
ham_class = ham.Ham
import sandwich.control
import unittest

class TestControl(unittest.TestCase):
    def test_loading_via_importlib(self):
        ham_in_fridge = sandwich.control.ham_class()
        self.assertEqual(ham_in_fridge.pieces, 10)

if __name__ == "__main__":