Test framework "undefined" is not installed

Environment data

• VS Code version: 1.33.1
• Extension version (available under the Extensions sidebar): 2019.4.6828-alpha

Steps to reproduce:

have a Python file open, create a venv (e.g. called “env”), select its interpreter. Enable unittest on the settings.json, and then delete the “env” folder and run the Discover Tets command. This prompt will appear:

Clicking on yes just hides the prompt.

Logs

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

Test Discovery failed: 
Error: spawn c:\Users\luabud\Apps\Example\Ex1\env\Scripts\python.exe ENOENT
Test Discovery failed: 
Error: spawn c:\Users\luabud\Apps\Example\Ex1\env\Scripts\python.exe ENOENT
Test Discovery failed: 
Error: spawn c:\Users\luabud\Apps\Example\Ex1\env\Scripts\python.exe ENOENT
Test Discovery failed: 
Error: spawn c:\Users\luabud\Apps\Example\Ex1\env\Scripts\python.exe ENOENT
Test Discovery failed: 
Error: spawn c:\Users\luabud\Apps\Example\Ex1\env\Scripts\python.exe ENOENT
Test Discovery failed: 
Error: spawn c:\Users\luabud\Apps\Example\Ex1\env\Scripts\python.exe ENOENT
start
Test Discovery failed: 
Error: spawn c:\Users\luabud\Apps\Example\Ex1\env\Scripts\python.exe ENOENT

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)

workbench.main.js:sourcemap:2370 Test framework undefined is not installed. Install?
onDidNotificationChange @ workbench.main.js:sourcemap:2370
workbench.main.js:sourcemap:235 [Extension Host] Python Extension: displayDiscoverStatus Error: spawn c:\Users\luabud\Apps\Example\Ex1\env\Scripts\python.exe ENOENT
	at Process.ChildProcess._handle.onexit (internal/child_process.js:229:19)
	at onErrorNT (internal/child_process.js:406:16)
	at process._tickCallback (internal/process/next_tick.js:63:19)
t.log @ workbench.main.js:sourcemap:235

[nmcspadden]

UPDATE: It resolved itself after I deleted the local .vscode folder inside the project, saved the workspace, and created a new .vscode/settings.json containing the testing settings. That seems to have fixed it.

ORIGINAL ISSUE:

I’m experiencing this identical issue. It was working yesterday, but today I restarted and now I get the exact same behavior:

VS Code 1.34.0

Extension:

Name: Python
Id: ms-python.python
Description: Linting, Debugging (multi-threaded, remote), Intellisense, code formatting, refactoring, unit tests, snippets, and more.
Version: 2019.4.12954
Publisher: Microsoft
VS Marketplace Link: https://marketplace.visualstudio.com/items?itemName=ms-python.python

Output log:

Test Discovery failed: 
Error: spawn C:\Program Files\Python27\python.exe ENOENT
Test Discovery failed: 
Error: spawn C:\Program Files\Python27\python.exe ENOENT

Dev tools console:

Python Extension: displayDiscoverStatus TypeError: Cannot read property 'uri' of undefined
	at module.exports.t.BaseTestManager._discoverTests.serviceContainer.get.discoverTests.then.catch.e (C:\Users\nmcspadden\.vscode\extensions\ms-python.python-2019.4.12954\out\client\extension.js:1:329501)
	at process._tickCallback (internal/process/next_tick.js:68:7)
  | t.log | @ | workbench.main.js:238
-- | -- | -- | --
  | $logExtensionHostMessage | @ | workbench.main.js:3178
  | _doInvokeHandler | @ | workbench.main.js:3252
  | _invokeHandler | @ | workbench.main.js:3252
  | _receiveRequest | @ | workbench.main.js:3251
  | _receiveOneMessage | @ | workbench.main.js:3249
  | _protocol.onMessage.e | @ | workbench.main.js:3248
  | fire | @ | workbench.main.js:77
  | a | @ | workbench.main.js:321
  | e | @ | workbench.main.js:321
  | fire | @ | workbench.main.js:77
  | _receiveMessage | @ | workbench.main.js:330
  | S._socketDisposables.push._socketReader.onMessage.e | @ | workbench.main.js:327
  | fire | @ | workbench.main.js:77
  | acceptChunk | @ | .main.js:323
  | _register._socket.onData.e | @ | workbench.main.js:323
  | t | @ | workbench.main.js:332
  | emit | @ | events.js:182
  | addChunk | @ | _stream_readable.js:279
  | readableAddChunk | @ | _stream_readable.js:264
  | Readable.push | @ | _stream_readable.js:219
  | onread | @ | net.js:636

I’ve confirmed I do not have a local workspace settings JSON file, nor a pycache folder of any kind.

[brettcannon]

Because we have not heard back with the information we requested, we are closing this issue for now. If you are able to provide the info later on then we will be happy to re-open this issue to pick up where we left off.