coverage subprocess

.coveragerc

[run]
branch = True
source = .

impl.py

def foo():
    return "foo"


def bar():
    return "bar"

requirements.txt

coverage
pytest

sitecustomize.py

import coverage
coverage.process_startup()

subproc_test.py

from impl import foo, bar


def test_foo():
    assert foo() == "foo"


def test_bar():
    assert bar() == "bar"

test.py

import subprocess

import os
os.environ['COVERAGE_PROCESS_START'] = ".coveragerc"


def test_via_subproc():
    proc = subprocess.Popen(["py.test", "subproc_test.py", "-v"])
    proc.wait()

$ PYTHONPATH=. coverage run -p --source . -m pytest -s -v test.py && coverage combine && coverage report
============================= test session starts ==============================
platform darwin -- Python 2.7.10 -- py-1.4.30 -- pytest-2.7.2 -- /Users/mattbennett/.virtualenvs/tmp-ad23438d009e56b5/bin/python2.7
rootdir: /Users/mattbennett/.virtualenvs/tmp-ad23438d009e56b5/0086536d500894448167, inifile:
collected 1 items

test.py::test_via_subproc ============================= test session starts ==============================
platform darwin -- Python 2.7.10 -- py-1.4.30 -- pytest-2.7.2 -- /Users/mattbennett/.virtualenvs/tmp-ad23438d009e56b5/bin/python2.7
rootdir: /Users/mattbennett/.virtualenvs/tmp-ad23438d009e56b5/0086536d500894448167, inifile:
collected 2 items

subproc_test.py::test_foo PASSED
subproc_test.py::test_bar PASSED

=========================== 2 passed in 0.01 seconds ===========================
PASSED

=========================== 1 passed in 0.24 seconds ===========================
Name            Stmts   Miss Branch BrMiss  Cover
-------------------------------------------------
impl                4      0      0      0   100%
sitecustomize       2      2      0      0     0%
subproc_test        5      0      0      0   100%
test                6      0      0      0   100%
-------------------------------------------------
TOTAL              17      2      0      0    88%

$ py.test -s -v test.py --cov --cov-report term
============================= test session starts ==============================
platform darwin -- Python 2.7.10 -- py-1.4.30 -- pytest-2.7.2 -- /Users/mattbennett/.virtualenvs/tmp-f17938f4e8d61189/bin/python2.7
rootdir: /private/tmp/coverage_subprocess, inifile:
plugins: cov
collected 1 items

test.py::test_via_subproc ============================= test session starts ==============================
platform darwin -- Python 2.7.10 -- py-1.4.30 -- pytest-2.7.2 -- /Users/mattbennett/.virtualenvs/tmp-f17938f4e8d61189/bin/python2.7
rootdir: /private/tmp/coverage_subprocess, inifile:
plugins: cov
collected 2 items

subproc_test.py::test_foo PASSED
subproc_test.py::test_bar PASSED

=========================== 2 passed in 0.01 seconds ===========================
PASSED
--------------- coverage: platform darwin, python 2.7.10-final-0 ---------------
Name            Stmts   Miss Branch BrMiss  Cover
-------------------------------------------------
impl                4      0      0      0   100%
sitecustomize       4      4      0      0     0%
subproc_test        5      0      0      0   100%
test                4      0      0      0   100%
-------------------------------------------------
TOTAL              17      4      0      0    76%

=========================== 1 passed in 0.28 seconds ===========================