Testing: Wrong python version or environment #25440

Type: Bug

When trying to discover the tests in my repository it throws the following error. Apparently it doesnt activate python or my environment correctly.

2025-09-04 15:48:08.376 [info] Discover tests for workspace name: modelBuilder - uri: /fast/home/s-kebrich/modelBuilder
2025-09-04 15:48:08.392 [info] arg: --rootdir already exists in args, not adding.
2025-09-04 15:48:08.393 [info] Environment variables set for pytest discovery: PYTHONPATH=/fast/home/s-kebrich/.vscode-server/extensions/ms-python.python-2025.12.0-linux-x64/python_files:/fast/home/s-kebrich/modelBuilder, TEST_RUN_PIPE=/run/user/1140/python-test-discovery-0ae26b119b3916000a75
2025-09-04 15:48:08.403 [info] > conda run -p ~/miniforge3/envs/MB2Europe --no-capture-output python ~/.vscode-server/extensions/ms-python.python-2025.12.0-linux-x64/python_files/get_output_via_markers.py ~/.vscode-server/extensions/ms-python.python-2025.12.0-linux-x64/python_files/printEnvVariables.py
2025-09-04 15:48:08.404 [info] shell: bash
2025-09-04 15:48:09.834 [info] > conda run -p ~/miniforge3/envs/MB2Europe --no-capture-output python ~/.vscode-server/extensions/ms-python.python-2025.12.0-linux-x64/python_files/get_output_via_markers.py -m pytest -p vscode_pytest --collect-only tests --rootdir=.
2025-09-04 15:48:09.834 [info] cwd: .
2025-09-04 15:48:11.052 [info] >>>PYTHON-EXEC-OUTPUT

2025-09-04 15:48:11.446 [error] ImportError while loading conftest '/fast/home/s-kebrich/modelBuilder/tests/conftest.py'.

2025-09-04 15:48:11.472 [error] tests/conftest.py:5: in
from modelBuilder.singletons import ModelLocations,ModelPaths,ModelTechnoEconomicData,InputDataInfo
modelBuilder/init.py:7: in
from .esMWorkflowManager import *
modelBuilder/esMWorkflowManager.py:1: in

2025-09-04 15:48:11.472 [error] import geopandas as gpd
E ModuleNotFoundError: No module named 'geopandas'

2025-09-04 15:48:11.472 [info] <<<PYTHON-EXEC-OUTPUT

2025-09-04 15:48:11.514 [error] ERROR conda.cli.main_run:execute(33): Subprocess for 'conda run ['python', '/fast/home/s-kebrich/.vscode-server/extensions/ms-python.python-2025.12.0-linux-x64/python_files/get_output_via_markers.py', '-m', 'pytest', '-p', 'vscode_pytest', '--collect-only', 'tests', '--rootdir=/fast/home/s-kebrich/modelBuilder']' command failed. (See above for error)

2025-09-04 15:48:11.538 [error] Subprocess exited unsuccessfully with exit code 4 and signal null on workspace /fast/home/s-kebrich/modelBuilder.
2025-09-04 15:48:11.539 [error] Subprocess exited unsuccessfully with exit code 4 and signal null on workspace /fast/home/s-kebrich/modelBuilder. Creating and sending error discovery payload
2025-09-04 15:48:11.539 [error] pytest test discovery error for workspace: /fast/home/s-kebrich/modelBuilder

The python test process was terminated before it could exit on its own, the process errored with: Code: 4, Signal: null for workspace /fast/home/s-kebrich/modelBuilder

Trying to activate the environment in the terminal only works if the base environment is deactivated manually:
(base) [s-kebrich@iek3028 modelBuilder]$ conda activate /fast/home/s-kebrich/miniforge3/envs/MB2Europe
(MB2Europe) [s-kebrich@iek3028 modelBuilder]$ which python
/opt/ohpc/pub/apps/anaconda3/bin/python
(MB2Europe) [s-kebrich@iek3028 modelBuilder]$ mamba deactivate
(base) [s-kebrich@iek3028 modelBuilder]$ mamba deactivate
[s-kebrich@iek3028 modelBuilder]$ mamba activate MB2Europe
(MB2Europe) [s-kebrich@iek3028 modelBuilder]$ which python
~/miniforge3/envs/MB2Europe/bin/python
(MB2Europe) [s-kebrich@iek3028 modelBuilder]$

Discovering the tests in the terminal after manually deactivating base and activating the desired env works and the tests succesfully load.
In the free version of mobaXterm, activating the environment and sending the command "which python" also reveals the correct version.

VS Code version: Code 1.103.2 (6f17636121051a53c88d3e605c491d22af2ba755, 2025-08-20T16:45:34.255Z)
OS version: Windows_NT x64 10.0.26100
Modes:
Remote OS version: Linux x64 4.18.0-477.15.1.el8_8.x86_64