ImportError while debbuging test within conda environment

[MaximeWeyl]

Environment data

• VS Code version: 1.32.3
• Extension version (available under the Extensions sidebar): 2019.3.6139
• OS and version: Windows_NT x64 10.0.17134
• Python version (& distribution if applicable, e.g. Anaconda): conda environment created from simple requirements.txt
• Type of virtual environment used (N/A | venv | virtualenv | conda | ...): conda
• Relevant/affected Python packages and their versions: pytest 4.3.1 and pandas 0.24.2

Expected behaviour

Launching a test works in "Run test" and "Debug test".

Actual behaviour

Launching a test works with "Run test" but not with "Debug test".
Error message is :

_____________________ ERROR collecting tests/test_lib.py ______________________

ImportError while importing test module 'c:\Users\PC\Desktop\test_pytest_debug_vscode\tests\test_lib.py'.

Hint: make sure your test modules/packages have valid Python names.
Traceback:
tests\test_lib.py:1: in <module>
    import pandas as pd
..\..\Anaconda3\envs\m2rp\lib\site-packages\pandas\__init__.py:19: in <module>
    "Missing required dependencies {0}".format(missing_dependencies))
E   ImportError: Missing required dependencies ['numpy']

Steps to reproduce:

1. From conda (4.6.8), create a new env :
   conda create --name test --file requirements.txt

With requirements.txt :

python=3.7
pytest
pandas

2. Select the created env as Python Interpreter
3. Run this test file with pytest from the test menu :

import pandas as pd

def test_sum():
    assert sum([1, 2, 3, 4]) == 10

3a. Running this test is ok
3b. Debugging this test fails

Note

When I create the environment from virtualenv and install the requirements.txt with pip, the bug does not occur.

Logs

Output for Python in the Output panel (View→Output, change the drop-down the upper-right of the Output panel to Python)

Nothing

Output from Console under the Developer Tools panel (toggle Developer Tools on under Help; turn on source maps to make any tracebacks be useful by running Enable source map support for extension debugging)

Nothing

[DonJayamanne]

Duplicate of #4300