mutmut

https://scrapbox.io/files/60fa457193682a002221d20f.png

実行結果

code:pytest

(venv) taka@SHIMIZUKAWA-X1C2018:~/mutmut$ pytest -q

------------------------------ generated html file: file:///home/taka/mutmut/report.html -------------------------------

----------- coverage: platform linux, python 3.6.9-final-0 -----------

Coverage HTML written to dir htmlcov

7 passed in 2.91s

code:mutmut run(console)

(venv) taka@SHIMIZUKAWA-X1C2018:~/mutmut$ mutmut run

- Mutation testing starting -

These are the steps:

1. A full test suite run will be made to make sure we

can run the tests successfully and we know how long

it takes (to detect infinite loops for example)

2. Mutants will be generated and checked

Results are stored in .mutmut-cache.

Legend for output:

🎉 Killed mutants. The goal is for everything to end up in this bucket.

⏰ Timeout. Test suite took 10 times as long as the baseline so were killed.

🤔 Suspicious. Tests took a long time, but not long enough to be fatal.

🙁 Survived. This means your tests needs to be expanded.

🔇 Skipped. Skipped.

1. Running tests without mutations

⠼ Running...Done

2. Checking mutants

⠋ 8/8 🎉 5 ⏰ 0 🤔 0 🙁 3 🔇 0

code:mutmut show all

(venv) taka@SHIMIZUKAWA-X1C2018:~/mutmut$ mutmut show all

To apply a mutant on disk:

mutmut apply <id>

To show a mutant:

mutmut show <id>

Survived 🙁 (3)

---- src/code.py (3) ----

# mutant 3

--- src/code.py

+++ src/code.py

@@ -1,7 +1,7 @@

def get_price(price: int, age: int, is_old: bool):

if is_old:

return min(price, 100)

- if not(18 <= age < 60):

+ if not(19 <= age < 60):

return price // 2

return price

# mutant 4

--- src/code.py

+++ src/code.py

@@ -1,7 +1,7 @@

def get_price(price: int, age: int, is_old: bool):

if is_old:

return min(price, 100)

- if not(18 <= age < 60):

+ if not(18 < age < 60):

return price // 2

return price

# mutant 7

--- src/code.py

+++ src/code.py

@@ -2,6 +2,6 @@

if is_old:

return min(price, 100)

if not(18 <= age < 60):

- return price // 2

+ return price / 2

return price

テスト対象コードとテスト

code:src/code.py

def get_price(price: int, age: int, is_old: bool):

if is_old:

return min(price, 100)

if not(18 <= age < 60):

return price // 2

return price

code:tests/test_code.py

import pytest

@pytest.fixture

def target():

import code

return code.get_price

@pytest.mark.parametrize(

"price,age,is_old,expected", [

(400, 10, False, 200),

(400, 20, False, 400),

(400, 60, False, 200),

(400, 10, True, 100),

(400, 20, True, 100),

(400, 60, True, 100),

(50, 20, True, 50),

])

def test_get_price(target, price, age, is_old, expected):

actual = target(price, age, is_old)

assert expected == actual

テスト対象の環境

code:consle

(venv) taka@SHIMIZUKAWA-X1C2018:~/mutmut$ tree -I venv

.

├── requirements.lock

├── requirements.txt

├── setup.cfg

├── src

│   └── code.py

└── tests

└── test_code.py

code:requirements.txt

pytest

pytest-pythonpath

pytest-cov

pytest-html

mutmut

code:requirements.lock

attrs==21.2.0

click==8.0.1

coverage==5.5

glob2==0.7

importlib-metadata==4.6.1

iniconfig==1.1.1

junit-xml==1.8

mutmut==2.1.0

packaging==21.0

parso==0.8.2

pkg-resources==0.0.0

pluggy==0.13.1

pony==0.7.14

py==1.10.0

pyparsing==2.4.7

pytest==6.2.4

pytest-cov==2.12.1

pytest-html==3.1.1

pytest-metadata==1.11.0

pytest-pythonpath==0.7.3

six==1.16.0

toml==0.10.2

typing-extensions==3.10.0.0

zipp==3.5.0

code:setup.cfg

addopts = --cov --cov-report=html --html=report.html --self-contained-html

python_paths = src/

testpaths = tests/

paths_to_mutate = src/

tests_dir = tests/

backup = True

runner = pytest

dict_synonyms = Struct, NamedStruct