`KeyError: 'params'` error when re-running pytest test

[DetachHead]

this started happening as of the latest vscode update (1.89.0)

to reproduce:

1. put a breakpoint in a pytest test
2. right click the run button and click "Debug test"
3. when it pauses on the breakpoint, click the restart button
4. check the debug console

   Traceback (most recent call last):
     File "C:\Users\user\AppData\Local\Programs\Python\Python312\Lib\runpy.py", line 198, in _run_module_as_main
       return _run_code(code, main_globals, None,
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
     File "C:\Users\user\AppData\Local\Programs\Python\Python312\Lib\runpy.py", line 88, in _run_code
       exec(code, run_globals)
     File "c:\Users\user\.vscode\extensions\ms-python.debugpy-2024.6.0-win32-x64\bundled\libs\debugpy\adapter/../..\debugpy\launcher/../..\debugpy\__main__.py", line 39, in <module>
       cli.main()
     File "c:\Users\user\.vscode\extensions\ms-python.debugpy-2024.6.0-win32-x64\bundled\libs\debugpy\adapter/../..\debugpy\launcher/../..\debugpy/..\debugpy\server\cli.py", line 430, in main
       run()
     File "c:\Users\user\.vscode\extensions\ms-python.debugpy-2024.6.0-win32-x64\bundled\libs\debugpy\adapter/../..\debugpy\launcher/../..\debugpy/..\debugpy\server\cli.py", line 284, in run_file
       runpy.run_path(target, run_name="__main__")
     File "c:\Users\user\.vscode\extensions\ms-python.debugpy-2024.6.0-win32-x64\bundled\libs\debugpy\_vendored\pydevd\_pydevd_bundle\pydevd_runpy.py", line 321, in run_path
       return _run_module_code(code, init_globals, run_name,
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
     File "c:\Users\user\.vscode\extensions\ms-python.debugpy-2024.6.0-win32-x64\bundled\libs\debugpy\_vendored\pydevd\_pydevd_bundle\pydevd_runpy.py", line 135, in _run_module_code
       _run_code(code, mod_globals, init_globals,
     File "c:\Users\user\.vscode\extensions\ms-python.debugpy-2024.6.0-win32-x64\bundled\libs\debugpy\_vendored\pydevd\_pydevd_bundle\pydevd_runpy.py", line 124, in _run_code
       exec(code, run_globals)
     File "c:\Users\user\.vscode\extensions\ms-python.python-2024.6.0\python_files\vscode_pytest\run_pytest_script.py", line 62, in <module>
       test_ids_from_buffer = raw_json["params"]
                              ~~~~~~~~^^^^^^^^^^
   KeyError: 'params'

[brenoimatos]

Same thing happening here.

[alfonzso]

Workaround (till not fixed): install/downgrade ms-python.python == 2024.4.1 version.

[golgor]

Also started experiencing this. Thanks for the workaround @alfonzso!

[iiwolf]

This was driving me nuts and I couldn't find a thread on it! Can confirm that downgrading works

[eleanorjboyd]

Hello! We are aware of this issue and actively working to get a fix- apologies for the delay this ended up being a more complex fix than anticipated. Thanks