How do I see stdout when running Django tests?
PythonDjangoDebuggingTestingStdoutPython Problem Overview
When I run tests with ./manage.py test, whatever I send to the standard output through print doesn't show. When tests fail, I see an "stdout" block per failed test, so I guess Django traps it (but doesn't show it when tests pass).
Python Solutions
Solution 1 - Python
Checked TEST_RUNNER in settings.py, it's using a project-specific runner that calls out to Nose. Nose has the -s option to stop it from capturing stdout, but if I run:
./manage.py test -s
manage.py captures it first and throws a "no such option" error. The help for manage.py doesn't mention this, but I found that if I run:
./manage.py test -- -s
it ignores the -s and lets me capture it on the custom runner's side, passing it to Nose without a problem.
Solution 2 - Python
Yeah, this issue is caused by NoseTestSuiteRunner. Adding -- -s is tricky and not the best solution.
Try to add the following lines in the settings.py:
NOSE_ARGS = ['--nocapture',
'--nologcapture',]
This solved my problems.
Solution 3 - Python
There are several levels of verbosity available which affects the amount of details we see: You can try:
python manage.py test -v 2
Other levels available are:
-
-v 0: Least amount of details -
-v 1: Default -
-v 2: More details e.g. print statements included.
Solution 4 - Python
Using current versions of all the relevant packages (Django==1.11.2, django-nose==1.4.5 and nose==1.3.7) it is sufficient to add the --nocapture flag when running your tests. Thus a simple
./manage.py test --nocapture
will suffice.
Granted of course that you have
TEST_RUNNER = "django_nose.NoseTestSuiteRunner"
in your settings.py
Solution 5 - Python
You probably have some intermediate test runner, such as Nose, intercepting and storing stdout. Try either running the Django tests directly, or write to stderr instead.