Refs: #16962

• macOS @jrieken
• linux @connor4312
• macOS @chrisdias (Optional)
• windows @rzhao271

Complexity: 3

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Requirements

1. You will need two versions of python for this 3.* and 2.7.
   1. You can either install from python.org
      OR
   2. You can use pyenv mac/linux or pyenv-win windows. Then use pyenv install 3.9.4 2.7.18 to get the two verisons.
2. Install python extension from here: https://pvsc.blob.core.windows.net/extension-builds/ms-python-insiders.vsix
3. Make sure you have "python.experiments.optInto": ["All"], in your user settings. If you did not have it, add it and reload.

Testing

1. Open an empty folder in VS Code.
2. Add following code to a file named test_example.py:

import unittest
class PassingTests(unittest.TestCase):
    def test_passing(self):
        self.assertEqual(42, 42)
    def test_passing_still(self):
        self.assertEqual("silly walk", "silly walk")
class FailingTests(unittest.TestCase):
    def test_failure(self):
        self.assertEqual(42, -13)
    def test_failure_still(self):
        self.assertEqual("I'm right!", "no, I am!")

3. Start with python version 3.*.
4. You can either configure tests using Python: configure tests... command from the command pallet, or go the test view and configure by using the welcome view, or you can run tests to get a prompt to configure.
5. Select unittest framework.
6. You should see the tests in the test view. Run the tests.
7. Now change python version to python 2.7, it should automatically refresh and allow you to run tests with python 2.7