prevent native REPL from caching state between sessions

[Paul (hutch3232)]

Resolves: #24359

Definitely warrants scrutiny / input as I've never written typescript before. Solved with trial and error + LLMs.

[Paul (hutch3232)]

@microsoft-github-policy-service agree

[Anthony Kim (anthonykim1)]

First of all, nice job and thank you for doing this.

One thing I want to suggest here:

Particularly in regards to:

                    this.pythonServer.dispose();
                    this.pythonServer = createPythonServer([this.interpreter.path as string], this.cwd);

After we dispose the "old" Python REPL server directly, we should add the new pythonServer into disposables array,
similar to

vscode-python/src/client/repl/replController.ts

Lines 9 to 10 in f12d5bc

	const server = createPythonServer([interpreterPath], cwd);
	disposables.push(server);

when we create Python (REPL) Server on createReplController function.

So essentially after the above referenced code that you contributed (in src/client/repl/nativeRepl.ts) could add line this.disposables.push(this.pythonServer);

Great work!

[Paul (hutch3232)]

Anthony Kim (@anthonykim1) I saw that I had a CI failure due to not having included a test for the new code. I have attempted to add that now.

Full disclosure: I don't know if the test actually works. I had planned to run it before and after applying my proposed fix, but was unable to. I tried very hard to run the test suite but could not get it to go. Even using the included .devcontainer was giving me a lot of issues.

[Paul (hutch3232)]

I see my test failed. Looking at this again, I realize I did not do this correctly. simply calling dispose() I don't think is right. I think to correctly do this I would need to simulate workspace.onDidCloseNotebookDocument event. I could use some guidance on that if possible.

[Anthony Kim (anthonykim1)]

Hi Paul (@hutch3232)

I've added some test to test out notebook close, along with tracking pythonServer gets called when notebook close event is called.

The key to this was figuring out triggering onDidCloseNotebook event, which signifies repl editor tab closing. Since we can't explicitly cursor click to close the repl tab during testing, we mock this with
notebookCloseEmitter.fire(closingNotebookDocument);

Have a look at the tests, and let me know if you don't understanding anything :)

Thanks.

[Anthony Kim (anthonykim1)]

FYI to further encourage and enhance future contributions (specific to creating tests and testing them locally), you can click on these different type of run options for tests on your run and debug panel, where you see all these different tests you can run.

It's worth pointing out that when you click on the setting gear icon here, it leads to .json tab where you can edit the

"VSC_PYTHON_CI_TEST_GREP": "" // Modify this to run a subset of the single workspace tests

to only run a specific test suite you desire.

For example,

`"VSC_PYTHON_CI_TEST_GREP": "REPL - Native REPL"

would've allowed you to only run the tests in native repl suite locally.

[Paul (hutch3232)]

Anthony Kim (@anthonykim1) thank you for your help finishing this! I think I would have struggled to figure all of that out. Anyways, I will try to get the tests working on my end for future development purposes.

[Anthony Kim (anthonykim1)]

you're most welcome Paul (@hutch3232) :)
Feel free to directly ping me if you need help in future PRs in the repo.

Thanks for your contribution!