How to execute ipdb.set_trace() at will while running pytest tests

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I'm using pytest for my test suite. While catching bugs in complex inter-components test, I would like to place import ipdb; ipdb.set_trace() in the middle of my code to allow me to debug it.

However, since pytest traps sys.stdin/sys.stdout ipdb fails. How can I use ipdb while testing with pytest.

I'm not interested in jumping to pdb or ipdb after a failure, but to place breaks anywhere in the code and be able to debug it there before the failure occurs.

The error is raised because of py.test capturing output.

You should run py.test with -s option (turn off capture output). For example:

py.test -s my_test.py

My Python testing set up, The py.test tool is handy for running a suite of tests in python. that file def test_abc(): . py.test will find all of these automatically and run them. Personally, I don't like that while debugging. import ipdb ipdb.set_trace(). or This post uses our test_example_form.py as example to illustrate different pdb tracing features. Using pytest to start pdb debugger. pytest by default comes with Python debugger support and allows to open the debugger pdb prompt(via a command line option) at the start of a test or when there are test failures.

pytest-ipdb is unfortunately not supported anymore.

The solution is to run pytest my_test.py --pdb --pdbcls=IPython.terminal.debugger:Pdb

From the help command:

pytest -h
  --pdb                 start the interactive Python debugger on errors.
  --pdbcls=modulename:classname
                        start a custom interactive Python debugger on errors.
                        For example:
                        --pdbcls=IPython.terminal.debugger:TerminalPdb

The difference is just that TerminalPdb seems to throw erros, but Pdb not (Ipython docs).

ipdb � PyPI, import ipdb ipdb.set_trace() ipdb.set_trace(context=5) # will show five Create a virtual environment, install IPython and run python ipdbplugin is a nose test runner plugin that also uses the IPython debugger instead of pdb. test_pytest_1.py. This file contains the implementation of Test Scenario — 1 (Run Selenium tests in parallel with Python on Chrome Browser). The @pytest.mark.usefixtures decorator is included

This is what I use

py.test tests/ --pdbcls=IPython.core.debugger:Pdb -s

Args are being ignored by pytest config: impossible to run ipdb even , Args are being ignored by pytest config: impossible to run ipdb even with -s # 9124 ipdb.set_trace() ) when I run tests using pytest I have to run pytest with debugger in the extension which will run the tests in debug mode. Now pytest will load the modules as tests.foo.test_view and tests.bar.test_view, allowing you to have modules with the same name.But now this introduces a subtle problem: in order to load the test modules from the tests directory, pytest prepends the root of the repository to sys.path, which adds the side-effect that now mypkg is also importable.

As of 2019-11 here is what should fix it:

pip install ipdb gnureadline ptpython

export PYTEST_ADDOPTS='--pdb --pdbcls=IPython.terminal.debugger:Pdb'

Debugging, Usage: # In the Python file you want to debug. import rpdb rpdb.set_trace(). And then you need run this in terminal to connect to this process. # Call in a terminal� In order to print the console logs, we need to use the command py.test –v –s. Again, if we want to run tests from a specific pytest file, the command is py.test <filename> -v. Pytest gives the feature of markers on the test methods. The marker is used to give properties or attributes to the test methods.

Running qiBuild test suite — qiBuild 2.1.1.16 documentation, You need to install the following Python packages to run the test suite: This will use pylint to find obvious errors (like variables referenced before assignement, This way when the bug is fixed we just have to remove the @pytest.skip and we are in foo.py def test_my_complicated_function(): import ipdb; ipdb.set_trace(). The example above will run TestMyClass.test_something but not TestMyClass.test_method_simple. Run tests by node ids. Each collected test is assigned a unique nodeid which consist of the module filename followed by specifiers like class names, function names and parameters from parametrization, separated by :: characters. To run a specific test

How I Debug My Code, pip install pytest-flake8 py.test --flake8 When I run into an unforeseen issue, my first stop is to interactively investigate the code by setting a breakpoint. You can use the built-in pdb module but just like ipython replaces the standard 28 import ipdb; ipdb.set_trace() ---> 29 context.obj['db'].set_up() 30 31� Stack Overflow Public questions and answers; Teams Private questions and answers for your team; Enterprise Private self-hosted questions and answers for your enterprise; Jobs Programming and related technical career opportunities

test, Pants uses the popular Pytest test runner to run Python tests. You may If you run ./pants test :: , and then you only change one target, then only that target will need to rerun and the others will use the cache. def test_debug(): import pdb; pdb.set_trace() assert 1 + 1 == 2 $ . ipdb is very helpful when debugging tests. All tests will be run from files and folders which are modified, but not yet committed. Automatically rerun failed tests on source modification. pytest-xdist provides a very useful feature of detecting all failed tests, and then waiting for you to modify files and continuously re-rerun those failing tests until they pass while you fix them. So

Comments
  • In case one wants to do this in Django, add addopts = -s to pytest.ini file.
  • TerminalPdb is working again and the preferred solution as it will give you tab completion.
  • look out for ppdb, its got ipython quality introspection
  • if you install prompt-toolkit version 2.0.10 then ipdb will work fine again, because it breaks due to recent update of this package to 3.0.0