problem importing tests module when running unit test

[martinjrobins]

I have a developer install of pybamm, and I'm trying to run a test on a recent branch off the develop branch. I'm trying to run an individual test from the command line, but am getting a problem with an import

(note I'm in a venv that has pybamm installed like so pip install -e .[all])

(env) ➜  PyBaMM git:(i4087-multiprocessing) ✗ python tests/unit/test_solvers/test_casadi_solver.py 
Traceback (most recent call last):
  File "/home/mrobins/git/PyBaMM/tests/unit/test_solvers/test_casadi_solver.py", line 4, in <module>
    from tests import TestCase
ImportError: cannot import name 'TestCase' from 'tests' (/home/mrobins/git/PyBaMM/env/lib/python3.10/site-packages/tests/__init__.py)

I'm not sure why its trying to look in /home/mrobins/git/PyBaMM/env/lib/python3.10/site-packages/tests or even why this package is installed, but when I remove it I get this error:

(env) ➜  PyBaMM git:(i4087-multiprocessing) ✗ rm -rf env/lib/python3.10/site-packages/tests 
(env) ➜  PyBaMM git:(i4087-multiprocessing) ✗ python tests/unit/test_solvers/test_casadi_solver.py
Traceback (most recent call last):
  File "/home/mrobins/git/PyBaMM/tests/unit/test_solvers/test_casadi_solver.py", line 4, in <module>
    from tests import TestCase
ModuleNotFoundError: No module named 'tests'

which is weird cause there is definitelly a subdir called tests under my pwd, and it has an ___init__.py in it....

Does anyone know why this would be happening?

[valentinsulzer]

A few years ago we had issues with pybtex putting its tests package into site-packages, could be related

[agriyakhetarpal]

I have faced this earlier, I remember that this started when #2833 was fixed but I never opened an issue about it – it's mostly just about how Python imports work, I feel. A way to run individual tests is to use pytest instead, which properly imports the tests module for you:

python -m pytest tests/test_module.py::TestClass::test_method

and another method is to use the importlib import mode

[martinjrobins]

yea, I tried pytest but this seems to be broken on my machine, some sort of threading problem?:

(env) ➜  PyBaMM git:(i4087-multiprocessing) ✗ python -m pytest tests/unit/test_solvers/test_casadi_solver.py 
============================================================================================================================================ test session starts =============================================================================================================================================
platform linux -- Python 3.10.12, pytest-8.2.0, pluggy-1.5.0 -- /home/mrobins/git/PyBaMM/env/bin/python
cachedir: .pytest_cache
rootdir: /home/mrobins/git/PyBaMM
configfile: pyproject.toml
plugins: cov-5.0.0, xdist-3.6.1, nbmake-1.5.3, anyio-4.3.0, devtools-0.12.2
initialized: 29/32 workersINTERNALERROR> Traceback (most recent call last):
INTERNALERROR>   File "/home/mrobins/git/PyBaMM/env/lib/python3.10/site-packages/_pytest/main.py", line 283, in wrap_session
INTERNALERROR>     config.hook.pytest_sessionstart(session=session)
INTERNALERROR>   File "/home/mrobins/git/PyBaMM/env/lib/python3.10/site-packages/pluggy/_hooks.py", line 513, in __call__
INTERNALERROR>     return self._hookexec(self.name, self._hookimpls.copy(), kwargs, firstresult)
INTERNALERROR>   File "/home/mrobins/git/PyBaMM/env/lib/python3.10/site-packages/pluggy/_manager.py", line 120, in _hookexec
INTERNALERROR>     return self._inner_hookexec(hook_name, methods, kwargs, firstresult)
INTERNALERROR>   File "/home/mrobins/git/PyBaMM/env/lib/python3.10/site-packages/pluggy/_callers.py", line 139, in _multicall
INTERNALERROR>     raise exception.with_traceback(exception.__traceback__)
INTERNALERROR>   File "/home/mrobins/git/PyBaMM/env/lib/python3.10/site-packages/pluggy/_callers.py", line 122, in _multicall
INTERNALERROR>     teardown.throw(exception)  # type: ignore[union-attr]
INTERNALERROR>   File "/home/mrobins/git/PyBaMM/env/lib/python3.10/site-packages/_pytest/logging.py", line 786, in pytest_sessionstart
INTERNALERROR>     return (yield)
INTERNALERROR>   File "/home/mrobins/git/PyBaMM/env/lib/python3.10/site-packages/pluggy/_callers.py", line 103, in _multicall
INTERNALERROR>     res = hook_impl.function(*args)
INTERNALERROR>   File "/home/mrobins/git/PyBaMM/env/lib/python3.10/site-packages/xdist/dsession.py", line 90, in pytest_sessionstart
INTERNALERROR>     nodes = self.nodemanager.setup_nodes(putevent=self.queue.put)
INTERNALERROR>   File "/home/mrobins/git/PyBaMM/env/lib/python3.10/site-packages/xdist/workermanage.py", line 88, in setup_nodes
INTERNALERROR>     return [self.setup_node(spec, putevent) for spec in self.specs]
INTERNALERROR>   File "/home/mrobins/git/PyBaMM/env/lib/python3.10/site-packages/xdist/workermanage.py", line 88, in <listcomp>
INTERNALERROR>     return [self.setup_node(spec, putevent) for spec in self.specs]
INTERNALERROR>   File "/home/mrobins/git/PyBaMM/env/lib/python3.10/site-packages/xdist/workermanage.py", line 97, in setup_node
INTERNALERROR>     gw = self.group.makegateway(spec)
INTERNALERROR>   File "/home/mrobins/git/PyBaMM/env/lib/python3.10/site-packages/execnet/multi.py", line 154, in makegateway
INTERNALERROR>     gw = gateway_bootstrap.bootstrap(io, spec)
INTERNALERROR>   File "/home/mrobins/git/PyBaMM/env/lib/python3.10/site-packages/execnet/gateway_bootstrap.py", line 95, in bootstrap
INTERNALERROR>     gw = execnet.Gateway(io, spec)
INTERNALERROR>   File "/home/mrobins/git/PyBaMM/env/lib/python3.10/site-packages/execnet/gateway.py", line 33, in __init__
INTERNALERROR>     self._initreceive()
INTERNALERROR>   File "/home/mrobins/git/PyBaMM/env/lib/python3.10/site-packages/execnet/gateway_base.py", line 1150, in _initreceive
INTERNALERROR>     self._receivepool.spawn(self._thread_receiver)
INTERNALERROR>   File "/home/mrobins/git/PyBaMM/env/lib/python3.10/site-packages/execnet/gateway_base.py", line 452, in spawn
INTERNALERROR>     self.execmodel.start(self._perform_spawn, (reply,))
INTERNALERROR>   File "/home/mrobins/git/PyBaMM/env/lib/python3.10/site-packages/execnet/gateway_base.py", line 155, in start
INTERNALERROR>     _thread.start_new_thread(func, args)
INTERNALERROR> RuntimeError: can't start new thread
Exception ignored in atexit callback: <bound method Group._cleanup_atexit of <Group []>>
Traceback (most recent call last):
  File "/home/mrobins/git/PyBaMM/env/lib/python3.10/site-packages/execnet/multi.py", line 208, in _cleanup_atexit
    self.terminate(timeout=1.0)
  File "/home/mrobins/git/PyBaMM/env/lib/python3.10/site-packages/execnet/multi.py", line 237, in terminate
    safe_terminate(
  File "/home/mrobins/git/PyBaMM/env/lib/python3.10/site-packages/execnet/multi.py", line 345, in safe_terminate
    reply = workerpool.spawn(termkill, termfunc, killfunc)
  File "/home/mrobins/git/PyBaMM/env/lib/python3.10/site-packages/execnet/gateway_base.py", line 452, in spawn
    self.execmodel.start(self._perform_spawn, (reply,))
  File "/home/mrobins/git/PyBaMM/env/lib/python3.10/site-packages/execnet/gateway_base.py", line 155, in start
    _thread.start_new_thread(func, args)
RuntimeError: can't start new thread
/home/mrobins/git/PyBaMM/env/lib/python3.10/site-packages/_pytest/main.py:320: PluggyTeardownRaisedWarning: A plugin raised an exception during an old-style hookwrapper teardown.                                                                                                                            
Plugin: 140026243197648, Hook: pytest_sessionfinish
OSError: cannot send (already closed?)
For more information see https://pluggy.readthedocs.io/en/stable/api_reference.html#pluggy.PluggyTeardownRaisedWarning
  config.hook.pytest_sessionfinish(
/home/mrobins/git/PyBaMM/env/lib/python3.10/site-packages/_pytest/main.py:320: PluggyTeardownRaisedWarning: A plugin raised an exception during an old-style hookwrapper teardown.
Plugin: 138899844541136, Hook: pytest_sessionfinish
OSError: cannot send (already closed?)
For more information see https://pluggy.readthedocs.io/en/stable/api_reference.html#pluggy.PluggyTeardownRaisedWarning
  config.hook.pytest_sessionfinish(
(env) ➜  PyBaMM git:(i4087-multiprocessing) ✗ /home/mrobins/git/PyBaMM/env/lib/python3.10/site-packages/_pytest/main.py:320: PluggyTeardownRaisedWarning: A plugin raised an exception during an old-style hookwrapper teardown.
Plugin: 124990894238416, Hook: pytest_sessionfinish
OSError: cannot send (already closed?)
For more information see https://pluggy.readthedocs.io/en/stable/api_reference.html#pluggy.PluggyTeardownRaisedWarning
  config.hook.pytest_sessionfinish(
(env) ➜  PyBaMM git:(69ca1597e) ✗ /home/mrobins/git/PyBaMM/env/lib/python3.10/site-packages/_pytest/main.py:320: PluggyTeardownRaisedWarning: A plugin raised an exception during an old-style hookwrapper teardown.
Plugin: 132161359850192, Hook: pytest_sessionfinish
OSError: cannot send (already closed?)
For more information see https://pluggy.readthedocs.io/en/stable/api_reference.html#pluggy.PluggyTeardownRaisedWarning
  config.hook.pytest_sessionfinish(
/home/mrobins/git/PyBaMM/env/lib/python3.10/site-packages/_pytest/main.py:320: PluggyTeardownRaisedWarning: A plugin raised an exception during an old-style hookwrapper teardown.
Plugin: 139622613641936, Hook: pytest_sessionfinish
OSError: cannot send (already closed?)
For more information see https://pluggy.readthedocs.io/en/stable/api_reference.html#pluggy.PluggyTeardownRaisedWarning
  config.hook.pytest_sessionfinish(
/home/mrobins/git/PyBaMM/env/lib/python3.10/site-packages/_pytest/main.py:320: PluggyTeardownRaisedWarning: A plugin raised an exception during an old-style hookwrapper teardown.
Plugin: 124312407976656, Hook: pytest_sessionfinish
OSError: cannot send (already closed?)
For more information see https://pluggy.readthedocs.io/en/stable/api_reference.html#pluggy.PluggyTeardownRaisedWarning
  config.hook.pytest_sessionfinish(
/home/mrobins/git/PyBaMM/env/lib/python3.10/site-packages/_pytest/main.py:320: PluggyTeardownRaisedWarning: A plugin raised an exception during an old-style hookwrapper teardown.
Plugin: 139222682659536, Hook: pytest_sessionfinish
OSError: cannot send (already closed?)
For more information see https://pluggy.readthedocs.io/en/stable/api_reference.html#pluggy.PluggyTeardownRaisedWarning
  config.hook.pytest_sessionfinish(
/home/mrobins/git/PyBaMM/env/lib/python3.10/site-packages/_pytest/main.py:320: PluggyTeardownRaisedWarning: A plugin raised an exception during an old-style hookwrapper teardown.
Plugin: 130349061565136, Hook: pytest_sessionfinish
OSError: cannot send (already closed?)
For more information see https://pluggy.readthedocs.io/en/stable/api_reference.html#pluggy.PluggyTeardownRaisedWarning
  config.hook.pytest_sessionfinish(
/home/mrobins/git/PyBaMM/env/lib/python3.10/site-packages/_pytest/main.py:320: PluggyTeardownRaisedWarning: A plugin raised an exception during an old-style hookwrapper teardown.
Plugin: 135978347211472, Hook: pytest_sessionfinish
OSError: cannot send (already closed?)
For more information see https://pluggy.readthedocs.io/en/stable/api_reference.html#pluggy.PluggyTeardownRaisedWarning
  config.hook.pytest_sessionfinish(
/home/mrobins/git/PyBaMM/env/lib/python3.10/site-packages/_pytest/main.py:320: PluggyTeardownRaisedWarning: A plugin raised an exception during an old-style hookwrapper teardown.
Plugin: 139643444046544, Hook: pytest_sessionfinish
OSError: cannot send (already closed?)
For more information see https://pluggy.readthedocs.io/en/stable/api_reference.html#pluggy.PluggyTeardownRaisedWarning
  config.hook.pytest_sessionfinish(
/home/mrobins/git/PyBaMM/env/lib/python3.10/site-packages/_pytest/main.py:320: PluggyTeardownRaisedWarning: A plugin raised an exception during an old-style hookwrapper teardown.
Plugin: 138623952399056, Hook: pytest_sessionfinish
OSError: cannot send (already closed?)
For more information see https://pluggy.readthedocs.io/en/stable/api_reference.html#pluggy.PluggyTeardownRaisedWarning
  config.hook.pytest_sessionfinish(
/home/mrobins/git/PyBaMM/env/lib/python3.10/site-packages/_pytest/main.py:320: PluggyTeardownRaisedWarning: A plugin raised an exception during an old-style hookwrapper teardown.
Plugin: 133665842211536, Hook: pytest_sessionfinish
OSError: cannot send (already closed?)
For more information see https://pluggy.readthedocs.io/en/stable/api_reference.html#pluggy.PluggyTeardownRaisedWarning
  config.hook.pytest_sessionfinish(
/home/mrobins/git/PyBaMM/env/lib/python3.10/site-packages/_pytest/main.py:320: PluggyTeardownRaisedWarning: A plugin raised an exception during an old-style hookwrapper teardown.
Plugin: 134856261397200, Hook: pytest_sessionfinish
OSError: cannot send (already closed?)
For more information see https://pluggy.readthedocs.io/en/stable/api_reference.html#pluggy.PluggyTeardownRaisedWarning
  config.hook.pytest_sessionfinish(
/home/mrobins/git/PyBaMM/env/lib/python3.10/site-packages/_pytest/main.py:320: PluggyTeardownRaisedWarning: A plugin raised an exception during an old-style hookwrapper teardown.
Plugin: 126256049466064, Hook: pytest_sessionfinish
OSError: cannot send (already closed?)
For more information see https://pluggy.readthedocs.io/en/stable/api_reference.html#pluggy.PluggyTeardownRaisedWarning
  config.hook.pytest_sessionfinish(

[martinjrobins]

only unittest seems to work ok:

 python -m unittest tests.unit.test_solvers.test_casadi_solver

[martinjrobins]

so I can use this for now....

[agriyakhetarpal]

That's quite strange, pytest doesn't work for me either, neither in series nor in parallel.

Parallel

python -m pytest tests/unit/test_solvers/test_casadi_solver.py
========================================================================= test session starts =========================================================================
platform darwin -- Python 3.11.9, pytest-8.2.0, pluggy-1.5.0 -- /Users/agriyakhetarpal/Desktop/PyBaMM/venv/bin/python
cachedir: .pytest_cache
rootdir: /Users/agriyakhetarpal/Desktop/PyBaMM
configfile: pyproject.toml
plugins: cov-5.0.0, nbmake-1.5.3, anyio-4.3.0, devtools-0.12.2, xdist-3.6.1
ready: 11/11 workers[gw3] node down: Not properly terminated

replacing crashed worker gw3
ready: 11/12 workers[gw5] node down: Not properly terminated

replacing crashed worker gw5
ready: 11/13 workers[gw1] node down: Not properly terminated

replacing crashed worker gw1
ready: 11/14 workers[gw8] node down: Not properly terminated

replacing crashed worker gw8
ready: 11/15 workers[gw9] node down: Not properly terminated

replacing crashed worker gw9
ready: 11/16 workers[gw4] node down: Not properly terminated

replacing crashed worker gw4
ready: 12/17 workers[gw6] node down: Not properly terminated

replacing crashed worker gw6
ready: 14/18 workers[gw2] node down: Not properly terminated

replacing crashed worker gw2
ready: 14/19 workers[gw7] node down: Not properly terminated

replacing crashed worker gw7
ready: 14/20 workers[gw0] node down: Not properly terminated

replacing crashed worker gw0
ready: 16/21 workers[gw10] node down: Not properly terminated

replacing crashed worker gw10
ready: 22/22 workers[gw12] node down: Not properly terminated

replacing crashed worker gw12
ready: 23/23 workers[gw13] node down: Not properly terminated

replacing crashed worker gw13
ready: 23/24 workers[gw11] node down: Not properly terminated

replacing crashed worker gw11
ready: 23/25 workers[gw15] node down: Not properly terminated

replacing crashed worker gw15
ready: 23/26 workers[gw14] node down: Not properly terminated

replacing crashed worker gw14
ready: 24/27 workers[gw17] node down: Not properly terminated

replacing crashed worker gw17
ready: 24/28 workers[gw16] node down: Not properly terminated

replacing crashed worker gw16
ready: 26/29 workers[gw20] node down: Not properly terminated

replacing crashed worker gw20
ready: 27/30 workers[gw18] node down: Not properly terminated

replacing crashed worker gw18
ready: 28/31 workers[gw19] node down: Not properly terminated

replacing crashed worker gw19
ready: 29/32 workers[gw21] node down: Not properly terminated

replacing crashed worker gw21
ready: 33/33 workers[gw22] node down: Not properly terminated

replacing crashed worker gw22
ready: 34/34 workers[gw23] node down: Not properly terminated

replacing crashed worker gw23
ready: 34/35 workers[gw24] node down: Not properly terminated

replacing crashed worker gw24
ready: 34/36 workers[gw26] node down: Not properly terminated

replacing crashed worker gw26
ready: 34/37 workers[gw25] node down: Not properly terminated

replacing crashed worker gw25
ready: 35/38 workers[gw27] node down: Not properly terminated

replacing crashed worker gw27
ready: 35/39 workers[gw28] node down: Not properly terminated

replacing crashed worker gw28
ready: 36/40 workers[gw29] node down: Not properly terminated

replacing crashed worker gw29
ready: 37/41 workers[gw30] node down: Not properly terminated

replacing crashed worker gw30
ready: 39/42 workers[gw31] node down: Not properly terminated

replacing crashed worker gw31
ready: 40/43 workers[gw32] node down: Not properly terminated

replacing crashed worker gw32
ready: 42/44 workers[gw33] node down: Not properly terminated

replacing crashed worker gw33
ready: 45/45 workers[gw34] node down: Not properly terminated

replacing crashed worker gw34
ready: 45/46 workers[gw36] node down: Not properly terminated

replacing crashed worker gw36
ready: 46/47 workers[gw35] node down: Not properly terminated

replacing crashed worker gw35
ready: 46/48 workers[gw37] node down: Not properly terminated

replacing crashed worker gw37
ready: 46/49 workers[gw39] node down: Not properly terminated

replacing crashed worker gw39
ready: 46/50 workers[gw38] node down: Not properly terminated

replacing crashed worker gw38
ready: 46/51 workers[gw40] node down: Not properly terminated

replacing crashed worker gw40
ready: 49/52 workers[gw41] node down: Not properly terminated

replacing crashed worker gw41
ready: 49/53 workers[gw43] node down: Not properly terminated

replacing crashed worker gw43
ready: 49/54 workers[gw42] node down: Not properly terminated

replacing crashed worker gw42
ready: 53/55 workers[gw44] node down: Not properly terminated

maximum crashed workers reached: 44
ready: 55/55 workers[gw45] node down: Not properly terminated

maximum crashed workers reached: 44
[gw48] node down: Not properly terminated

maximum crashed workers reached: 44
[gw46] node down: Not properly terminated

maximum crashed workers reached: 44
[gw47] node down: Not properly terminated

maximum crashed workers reached: 44
[gw49] node down: Not properly terminated

maximum crashed workers reached: 44
[gw50] node down: Not properly terminated

maximum crashed workers reached: 44
[gw51] node down: Not properly terminated

maximum crashed workers reached: 44
[gw52] node down: Not properly terminated

maximum crashed workers reached: 44
[gw54] node down: Not properly terminated

maximum crashed workers reached: 44
[gw53] node down: Not properly terminated

maximum crashed workers reached: 44

============================================================= xdist: maximum crashed workers reached: 44 ==============================================================
======================================================================= no tests ran in 45.49s ========================================================================

Serial

python -m pytest -n 1 tests/unit/test_solvers/test_casadi_solver.py
========================================================================= test session starts =========================================================================
platform darwin -- Python 3.11.9, pytest-8.2.0, pluggy-1.5.0 -- /Users/agriyakhetarpal/Desktop/PyBaMM/venv/bin/python
cachedir: .pytest_cache
rootdir: /Users/agriyakhetarpal/Desktop/PyBaMM
configfile: pyproject.toml
plugins: cov-5.0.0, nbmake-1.5.3, anyio-4.3.0, devtools-0.12.2, xdist-3.6.1
ready: 1/1 worker      [gw0] node down: Not properly terminated

replacing crashed worker gw0
ready: 2/2 workers[gw1] node down: Not properly terminated

replacing crashed worker gw1
ready: 3/3 workers[gw2] node down: Not properly terminated

replacing crashed worker gw2
ready: 4/4 workers[gw3] node down: Not properly terminated

replacing crashed worker gw3
ready: 5/5 workers[gw4] node down: Not properly terminated

maximum crashed workers reached: 4

============================================================== xdist: maximum crashed workers reached: 4 ==============================================================
======================================================================== no tests ran in 5.85s ========================================================================

[prady0t]

It's working for me. Inside a virtual env I did pip install -e "[all]" then
python -m pytest tests/unit/test_solvers/test_casadi_solver.py. Here's the output :

platform darwin -- Python 3.12.2, pytest-8.2.1, pluggy-1.5.0 -- /Users/pradyotranjan/PycharmProjects/PyBaMM/venv/bin/python3
cachedir: .pytest_cache
rootdir: /Users/pradyotranjan/PycharmProjects/PyBaMM
configfile: pyproject.toml
plugins: anyio-4.3.0, devtools-0.12.2, xdist-3.6.1
8 workers [23 items]    
scheduling tests via LoadScheduling

tests/unit/test_solvers/test_casadi_solver.py::TestCasadiSolver::test_without_grid 
tests/unit/test_solvers/test_casadi_solver.py::TestCasadiSolver::test_model_step_events 
tests/unit/test_solvers/test_casadi_solver.py::TestCasadiSolver::test_model_solver_with_non_identity_mass 
tests/unit/test_solvers/test_casadi_solver.py::TestCasadiSolver::test_dae_solver_algebraic_model 
tests/unit/test_solvers/test_casadi_solver.py::TestCasadiSolver::test_model_solver_events 
tests/unit/test_solvers/test_casadi_solver.py::TestCasadiSolver::test_model_solver_python 
tests/unit/test_solvers/test_casadi_solver.py::TestCasadiSolver::test_bad_mode 
[gw0] [  4%] PASSED tests/unit/test_solvers/test_casadi_solver.py::TestCasadiSolver::test_bad_mode 
tests/unit/test_solvers/test_casadi_solver.py::TestCasadiSolver::test_model_solver 
tests/unit/test_solvers/test_casadi_solver.py::TestCasadiSolver::test_casadi_safe_no_termination 
[gw1] [  8%] PASSED tests/unit/test_solvers/test_casadi_solver.py::TestCasadiSolver::test_dae_solver_algebraic_model 
tests/unit/test_solvers/test_casadi_solver.py::TestCasadiSolver::test_interpolant_extrapolate 
[gw0] [ 13%] PASSED tests/unit/test_solvers/test_casadi_solver.py::TestCasadiSolver::test_casadi_safe_no_termination 
tests/unit/test_solvers/test_casadi_solver.py::TestCasadiSolverODEsWithForwardSensitivityEquations::test_solve_sensitivity_scalar_var_vector_input 
[gw1] [ 17%] PASSED tests/unit/test_solvers/test_casadi_solver.py::TestCasadiSolver::test_interpolant_extrapolate 
tests/unit/test_solvers/test_casadi_solver.py::TestCasadiSolverODEsWithForwardSensitivityEquations::test_solve_sensitivity_subset 
[gw4] [ 21%] PASSED tests/unit/test_solvers/test_casadi_solver.py::TestCasadiSolver::test_model_solver_python 
tests/unit/test_solvers/test_casadi_solver.py::TestCasadiSolver::test_model_solver_with_inputs 
[gw5] [ 26%] PASSED tests/unit/test_solvers/test_casadi_solver.py::TestCasadiSolver::test_model_solver_with_non_identity_mass 
[gw2] [ 30%] PASSED tests/unit/test_solvers/test_casadi_solver.py::TestCasadiSolver::test_model_solver 
tests/unit/test_solvers/test_casadi_solver.py::TestCasadiSolver::test_model_step 
tests/unit/test_solvers/test_casadi_solver.py::TestCasadiSolver::test_model_solver_dae_inputs_in_initial_conditions 
[gw1] [ 34%] PASSED tests/unit/test_solvers/test_casadi_solver.py::TestCasadiSolverODEsWithForwardSensitivityEquations::test_solve_sensitivity_subset 
tests/unit/test_solvers/test_casadi_solver.py::TestCasadiSolverODEsWithForwardSensitivityEquations::test_solve_sensitivity_vector_var_scalar_input 
[gw5] [ 39%] PASSED tests/unit/test_solvers/test_casadi_solver.py::TestCasadiSolver::test_model_step 
[gw2] [ 43%] PASSED tests/unit/test_solvers/test_casadi_solver.py::TestCasadiSolver::test_model_solver_dae_inputs_in_initial_conditions 
tests/unit/test_solvers/test_casadi_solver.py::TestCasadiSolverDAEsWithForwardSensitivityEquations::test_solve_sensitivity_scalar_var_scalar_input 
tests/unit/test_solvers/test_casadi_solver.py::TestCasadiSolverDAEsWithForwardSensitivityEquations::test_solve_sensitivity_subset 
[gw5] [ 47%] PASSED tests/unit/test_solvers/test_casadi_solver.py::TestCasadiSolverDAEsWithForwardSensitivityEquations::test_solve_sensitivity_scalar_var_scalar_input 
[gw2] [ 52%] PASSED tests/unit/test_solvers/test_casadi_solver.py::TestCasadiSolverDAEsWithForwardSensitivityEquations::test_solve_sensitivity_subset 
[gw0] [ 56%] PASSED tests/unit/test_solvers/test_casadi_solver.py::TestCasadiSolverODEsWithForwardSensitivityEquations::test_solve_sensitivity_scalar_var_vector_input 
tests/unit/test_solvers/test_casadi_solver.py::TestCasadiSolverODEsWithForwardSensitivityEquations::test_solve_sensitivity_then_no_sensitivity 
[gw0] [ 60%] PASSED tests/unit/test_solvers/test_casadi_solver.py::TestCasadiSolverODEsWithForwardSensitivityEquations::test_solve_sensitivity_then_no_sensitivity 
[gw7] [ 65%] PASSED tests/unit/test_solvers/test_casadi_solver.py::TestCasadiSolver::test_without_grid 
tests/unit/test_solvers/test_casadi_solver.py::TestCasadiSolverODEsWithForwardSensitivityEquations::test_solve_sensitivity_scalar_var_scalar_input 
[gw6] [ 69%] PASSED tests/unit/test_solvers/test_casadi_solver.py::TestCasadiSolver::test_model_step_events 
tests/unit/test_solvers/test_casadi_solver.py::TestCasadiSolver::test_model_step_with_input 
[gw1] [ 73%] PASSED tests/unit/test_solvers/test_casadi_solver.py::TestCasadiSolverODEsWithForwardSensitivityEquations::test_solve_sensitivity_vector_var_scalar_input 
[gw6] [ 78%] PASSED tests/unit/test_solvers/test_casadi_solver.py::TestCasadiSolver::test_model_step_with_input 
[gw7] [ 82%] PASSED tests/unit/test_solvers/test_casadi_solver.py::TestCasadiSolverODEsWithForwardSensitivityEquations::test_solve_sensitivity_scalar_var_scalar_input 
[gw3] [ 86%] PASSED tests/unit/test_solvers/test_casadi_solver.py::TestCasadiSolver::test_model_solver_events 
tests/unit/test_solvers/test_casadi_solver.py::TestCasadiSolver::test_model_solver_failure 
[gw4] [ 91%] PASSED tests/unit/test_solvers/test_casadi_solver.py::TestCasadiSolver::test_model_solver_with_inputs 
tests/unit/test_solvers/test_casadi_solver.py::TestCasadiSolverDAEsWithForwardSensitivityEquations::test_solve_sensitivity_algebraic 
[gw4] [ 95%] PASSED tests/unit/test_solvers/test_casadi_solver.py::TestCasadiSolverDAEsWithForwardSensitivityEquations::test_solve_sensitivity_algebraic 
[gw3] [100%] PASSED tests/unit/test_solvers/test_casadi_solver.py::TestCasadiSolver::test_model_solver_failure 

========================================================================================================== 23 passed in 5.95s ==========================================================================================================

For python -m pytest -n 1 tests/unit/test_solvers/test_casadi_solver.py , output :

platform darwin -- Python 3.12.2, pytest-8.2.1, pluggy-1.5.0 -- /Users/pradyotranjan/PycharmProjects/PyBaMM/venv/bin/python
cachedir: .pytest_cache
rootdir: /Users/pradyotranjan/PycharmProjects/PyBaMM
configfile: pyproject.toml
plugins: anyio-4.3.0, devtools-0.12.2, xdist-3.6.1
1 worker [23 items]    
scheduling tests via LoadScheduling

tests/unit/test_solvers/test_casadi_solver.py::TestCasadiSolver::test_bad_mode 
[gw0] [  4%] PASSED tests/unit/test_solvers/test_casadi_solver.py::TestCasadiSolver::test_bad_mode 
tests/unit/test_solvers/test_casadi_solver.py::TestCasadiSolver::test_casadi_safe_no_termination 
[gw0] [  8%] PASSED tests/unit/test_solvers/test_casadi_solver.py::TestCasadiSolver::test_casadi_safe_no_termination 
tests/unit/test_solvers/test_casadi_solver.py::TestCasadiSolver::test_dae_solver_algebraic_model 
[gw0] [ 13%] PASSED tests/unit/test_solvers/test_casadi_solver.py::TestCasadiSolver::test_dae_solver_algebraic_model 
tests/unit/test_solvers/test_casadi_solver.py::TestCasadiSolver::test_interpolant_extrapolate 
[gw0] [ 17%] PASSED tests/unit/test_solvers/test_casadi_solver.py::TestCasadiSolver::test_interpolant_extrapolate 
tests/unit/test_solvers/test_casadi_solver.py::TestCasadiSolver::test_model_solver 
[gw0] [ 21%] PASSED tests/unit/test_solvers/test_casadi_solver.py::TestCasadiSolver::test_model_solver 
tests/unit/test_solvers/test_casadi_solver.py::TestCasadiSolver::test_model_solver_dae_inputs_in_initial_conditions 
[gw0] [ 26%] PASSED tests/unit/test_solvers/test_casadi_solver.py::TestCasadiSolver::test_model_solver_dae_inputs_in_initial_conditions 
tests/unit/test_solvers/test_casadi_solver.py::TestCasadiSolver::test_model_solver_events 
[gw0] [ 30%] PASSED tests/unit/test_solvers/test_casadi_solver.py::TestCasadiSolver::test_model_solver_events 
tests/unit/test_solvers/test_casadi_solver.py::TestCasadiSolver::test_model_solver_failure 
[gw0] [ 34%] PASSED tests/unit/test_solvers/test_casadi_solver.py::TestCasadiSolver::test_model_solver_failure 
tests/unit/test_solvers/test_casadi_solver.py::TestCasadiSolver::test_model_solver_python 
[gw0] [ 39%] PASSED tests/unit/test_solvers/test_casadi_solver.py::TestCasadiSolver::test_model_solver_python 
tests/unit/test_solvers/test_casadi_solver.py::TestCasadiSolver::test_model_solver_with_inputs 
[gw0] [ 43%] PASSED tests/unit/test_solvers/test_casadi_solver.py::TestCasadiSolver::test_model_solver_with_inputs 
tests/unit/test_solvers/test_casadi_solver.py::TestCasadiSolver::test_model_solver_with_non_identity_mass 
[gw0] [ 47%] PASSED tests/unit/test_solvers/test_casadi_solver.py::TestCasadiSolver::test_model_solver_with_non_identity_mass 
tests/unit/test_solvers/test_casadi_solver.py::TestCasadiSolver::test_model_step 
[gw0] [ 52%] PASSED tests/unit/test_solvers/test_casadi_solver.py::TestCasadiSolver::test_model_step 
tests/unit/test_solvers/test_casadi_solver.py::TestCasadiSolver::test_model_step_events 
[gw0] [ 56%] PASSED tests/unit/test_solvers/test_casadi_solver.py::TestCasadiSolver::test_model_step_events 
tests/unit/test_solvers/test_casadi_solver.py::TestCasadiSolver::test_model_step_with_input 
[gw0] [ 60%] PASSED tests/unit/test_solvers/test_casadi_solver.py::TestCasadiSolver::test_model_step_with_input 
tests/unit/test_solvers/test_casadi_solver.py::TestCasadiSolver::test_without_grid 
[gw0] [ 65%] PASSED tests/unit/test_solvers/test_casadi_solver.py::TestCasadiSolver::test_without_grid 
tests/unit/test_solvers/test_casadi_solver.py::TestCasadiSolverODEsWithForwardSensitivityEquations::test_solve_sensitivity_scalar_var_scalar_input 
[gw0] [ 69%] PASSED tests/unit/test_solvers/test_casadi_solver.py::TestCasadiSolverODEsWithForwardSensitivityEquations::test_solve_sensitivity_scalar_var_scalar_input 
tests/unit/test_solvers/test_casadi_solver.py::TestCasadiSolverODEsWithForwardSensitivityEquations::test_solve_sensitivity_scalar_var_vector_input 
[gw0] [ 73%] PASSED tests/unit/test_solvers/test_casadi_solver.py::TestCasadiSolverODEsWithForwardSensitivityEquations::test_solve_sensitivity_scalar_var_vector_input 
tests/unit/test_solvers/test_casadi_solver.py::TestCasadiSolverODEsWithForwardSensitivityEquations::test_solve_sensitivity_subset 
[gw0] [ 78%] PASSED tests/unit/test_solvers/test_casadi_solver.py::TestCasadiSolverODEsWithForwardSensitivityEquations::test_solve_sensitivity_subset 
tests/unit/test_solvers/test_casadi_solver.py::TestCasadiSolverODEsWithForwardSensitivityEquations::test_solve_sensitivity_then_no_sensitivity 
[gw0] [ 82%] PASSED tests/unit/test_solvers/test_casadi_solver.py::TestCasadiSolverODEsWithForwardSensitivityEquations::test_solve_sensitivity_then_no_sensitivity 
tests/unit/test_solvers/test_casadi_solver.py::TestCasadiSolverODEsWithForwardSensitivityEquations::test_solve_sensitivity_vector_var_scalar_input 
[gw0] [ 86%] PASSED tests/unit/test_solvers/test_casadi_solver.py::TestCasadiSolverODEsWithForwardSensitivityEquations::test_solve_sensitivity_vector_var_scalar_input 
tests/unit/test_solvers/test_casadi_solver.py::TestCasadiSolverDAEsWithForwardSensitivityEquations::test_solve_sensitivity_algebraic 
[gw0] [ 91%] PASSED tests/unit/test_solvers/test_casadi_solver.py::TestCasadiSolverDAEsWithForwardSensitivityEquations::test_solve_sensitivity_algebraic 
tests/unit/test_solvers/test_casadi_solver.py::TestCasadiSolverDAEsWithForwardSensitivityEquations::test_solve_sensitivity_scalar_var_scalar_input 
[gw0] [ 95%] PASSED tests/unit/test_solvers/test_casadi_solver.py::TestCasadiSolverDAEsWithForwardSensitivityEquations::test_solve_sensitivity_scalar_var_scalar_input 
tests/unit/test_solvers/test_casadi_solver.py::TestCasadiSolverDAEsWithForwardSensitivityEquations::test_solve_sensitivity_subset 
[gw0] [100%] PASSED tests/unit/test_solvers/test_casadi_solver.py::TestCasadiSolverDAEsWithForwardSensitivityEquations::test_solve_sensitivity_subset 

========================================================================================================== 23 passed in 1.88s ==========================================================================================================