django_bench_runner - Locate slow tests

Django Bench Runner is a drop-in enhancement of the default django test runner that times how long it takes to run individual tests. It helps detect tests that might need optimization.

Installation

pip install django-bench-runner

In settings.py, add:

TEST_RUNNER = 'django_bench_runner.runner.BenchRunner'

Usage

Add the -b (or --benchmark) flag when running your tests.

Colorization

Tests that run under .5 seconds are colored green. The resulting tests are divvied into 3 groups. The fastest third (yellow), the middle third (magenta), and the slowest third (red). Red tests do not mean the tests are necessarily bad or in critical need of a speedup. It is just a graphical way to identify the various times of the tests.

Example Output

$ ./manage.py test core.tests.test_transfer_money -b --keepdb
Using existing test database for alias 'default'...
..

Test                                                              Runtime    Percent
--------------------------------------------------------------  ---------  ---------

core.tests.test_transfer_money.TestReleaseAmounts
: test_wells_fargo                                                8.25052     47.81%
: test_wells_fargo_exempt_from_prefunding                         9.00663     52.19%
---------------------------                                       -------    -------
TestReleaseAmounts                                               17.25715    100.00%

----------------------------------------------------------------------
Ran 2 tests in 17.262s

OK

Django compatibility

Tested and working in Django 1.8 and 1.9.

Credits

Special thanks Sergey Astanin for tabulate