Test discovery failed with pyspark

[Timbonz49]

Environment data

• VS Code version: 1.40.0-insider (system setup)
  Commit: 33cc09d
  Date: 2019-10-28T11:50:41.596Z
  Electron: 6.1.2
  Chrome: 76.0.3809.146
  Node.js: 12.4.0
  V8: 7.6.303.31-electron.0
  OS: Windows_NT x64 10.0.16299

Name: Python
Id: ms-python.python
Description: Linting, Debugging (multi-threaded, remote), Intellisense, code formatting, refactoring, unit tests, snippets, and more.
Version: 2019.11.45343-dev
Publisher: Microsoft
VS Marketplace Link: https://marketplace.visualstudio.com/items?itemName=ms-python.python

• Extension version (available under the Extensions sidebar): XXX
• OS and version: WSL Ubuntu
• Python version (& distribution if applicable, e.g. Anaconda): Python 3.6.8
• Type of virtual environment used: venv
• Relevant/affected Python packages and their versions: XXX
• Jedi or Language Server? (i.e. what is "python.jediEnabled" set to; more info How to update the language server to the latest stable version #3977): Jedi enabled

Expected behaviour

Discover works

Actual behaviour

python /home/tim/.vscode-server-insiders/extensions/ms-python.python-2019.11.45343-dev/pythonFiles/testing_tools/run_adapter.py discover pytest -- --rootdir /mnt/c/projects/data_platform -s --cache-clear .
Test Discovery failed:
Error: 19/10/31 01:58:05 WARN Utils: Your hostname, T422B-L103550 resolves to a loopback address: 127.0.1.1; using 192.168.123.134 instead (on interface eth3)
19/10/31 01:58:05 WARN Utils: Set SPARK_LOCAL_IP if you need to bind to another address
19/10/31 01:58:05 WARN NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
Setting default log level to "WARN".
To adjust logging level use sc.setLogLevel(newLevel). For SparkR, use setLogLevel(newLevel).

We have modules that are using python modules with the following imports

from pyspark.sql import SparkSession
import pyspark.sql

I think the issue is related to the stderr output, in bold above. If I add "2> /dev/null" to the command I get the list/dict/json output expected

[brettcannon]

Duplicate of #6594