Test 2.7 notification

[kimadeline]

Refs: #17009

• macOS @rzhao271
• linux @aeschli
• windows @brettcannon (Optional)
• windows @bamurtaugh

Complexity: 3

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Requirements

1. You will need two versions of python for this, Python 3 (doesn't matter which one), and Python 2.7. Options are:
   • You can install them both from python.org
   • On Mac/Linux, you can install one version of python using your local package manager, and use pyenv to install the other one
   • You can also go for a full pyenv solution on Mac/Linux or pyenv-win on windows and call pyenv install 3.9.4 2.7.18 to get the two versions.
2. Make sure you have "python.experiments.optInto": ["All"], in your user settings. If not, add it and reload VS Code.
3. Make sure python.defaultInterpreterPath entry in your user and workspace settings are at their default value python
4. Set up a workspace with at least one Python file
5. Use the following build of the Python extension: https://github.com/microsoft/vscode-python/suites/3575138020/artifacts/85925936

Scenario 1: Python 2.7 on load

1. Create a folder with a python file

2. In this folder, create a virtual environment with python 2.7: usr/bin/python2 -m virtualenv .venv

3. Open the folder in VS Code

4. Make sure that the extension loads, and that the virtual environment gets auto-selected

5. Make sure that the following notification appears:
   

6. Make sure that Learn more redirects to https://github.com/microsoft/vscode-python/wiki/Limited-support-for-Python-2.7.

7. Do NOT dismiss the notification or click on "Got it" (or it will never appear ever again), then close the folder and reopen it in VS Code

8. Make sure that the notification appears again after the extension loads

9. Do NOT dismiss the notification, close everything

Scenario 2: Python 3 on load + do not show again

1. Create a folder with a python file
2. In this folder, create a virtual environment with python 3: usr/bin/python3 -m venv .venv
3. Open the folder in VS Code
4. Make sure that the extension loads, and that the virtual environment gets auto-selected
5. Make sure that the notification above doesn't appear
6. Click on the environment in the status bar, and then select a 2.7 interpreter in the quickpick that appears (search for 2.7)
7. Make sure that the notification appears
8. Click on "Got it!"
9. Close the folder and reopen it in VS Code
10. Make sure that the 2.7 interpreter is selected when the extension loads, and that the notification above doesn't appear

[rzhao271]

The testplan item worked after using the extension from #17102 (comment)