Myujth

I am running the following through a Makefiel:

NPROCS:=$(shell /usr/bin/nproc)

.PHONY: coverage-app
coverage-app:
 coverage erase --rcfile=./.coveragerc-app
 coverage run --parallel-mode --rcfile=./.coveragerc-app manage.py test -v 3 --parallel=$(NPROCS) app
 coverage combine --rcfile=./.coveragerc-app
 coverage report -m --rcfile=./.coveragerc-app

If I set NPROCS to 1, I get the expected 100% test coverage of all files within app. However, if NPROCS is greater than 1, I get lots of missing lines in my report.

What am I doing wrong?

My .coveragerc-app is as follows:

# Control coverage.py
[run]
branch = True
omit = */__init__*
 */test*.py
 */migrations/*
 */urls.py
 app/admin.py
 app/apps.py
source = app
parallel = true

[report]
precision = 1
show_missing = True
ignore_errors = True
exclude_lines =
 pragma: no cover
 raise NotImplementedError
 except ImportError
 def __repr__
 if self.logger.debug
 if __name__ == .__main__.:

You miss a few steps, from Measuring sub-processes:

1) change the coverage run command to this one :

COVERAGE_PROCESS_START=./.coveragerc-app coverage run --parallel-mode --concurrency=multiprocessing --rcfile=./.coveragerc-app manage.py test -v 3 --parallel=$(NPROCS) app

2) Create a file named sitecustomize.py in your local folder with

import coverage
coverage.process_startup()

3) Add concurrency option in your rcfile:

concurrency=multiprocessing

Per the documentation:

Coverage should be run in a single process to obtain accurate statistics.

Not an answer to this question but for those looking to optimize their project in this manner it may be helpful to know it isn't recommended by Django maintainers.