VSCode extension testing: Use `vscode.executeDefinitionProvider` in test - visual-studio-code

Question

Background
I'm trying to auto-test my VSCode extension. The extension works with python files and uses vscode.executeDefinitionProvider and vscode.executeDocumentSymbolProvider on them.
Problem
vscode.executeDefinitionProvider always returns [], vscode.executeDocumentSymbolProvider always returns undefined.
Notes
When running the same code in a debug session of the extension (no test session), the commands work flawless.
I ensured the extensions to be available during the test and even manually activated them with
let ext = vscode.extensions.getExtension("ms-python.python");
assert.notStrictEqual (ext, undefined);
await ext?.activate ();
ext = vscode.extensions.getExtension("ms-python.vscode-pylance");
assert.notStrictEqual (ext, undefined);
await ext?.activate ();
Question
How do I get the commands to succeed during automated test.
Edit: Workaround
Apparently VSCode takes its time to really activate the extensions. I could get it working placing a await sleep (10000); in index.ts::run () before return new Promise((c, e) => {.
While this is working, it's a really unstable workaround, Is there any way to make the code wait until the whole environment is fully loaded?

Answer 1

In the end nothing really stably worked for me, so I resorted to the following (perfectly fine working) solution.
My auto tests are run from the productive environment, like any other extension.
In package.json I created a new command _test.
the command would run ./test/suite/index.ts : run().

Answer 2

Extension<T>::activate(): Thenable<T>
Returns: Thenable<T> - A promise that will resolve when this extension has been activated.
await ext?.activate();