Tests for PYTHONSTARTUP setting

[anthonykim1]

Adding test for: #24111

[anthonykim1]

Need to resolve: Keep running into context.environmentVariableCollection.replace is not a function error:

Tried to follow logic in

vscode-python/src/test/interpreters/activation/terminalEnvVarCollectionService.unit.test.ts

Line 82 in af2aa6e

collection = mock<EnvironmentVariableCollection>();

but still same error.

It seems that problem is I cannot access environmentVariableCollection from IExtensionContext ONLY when I'm in the test file.

[anthonykim1]

Note: All Three approach of trying to setup/mock EnvironmentCollection.replace is giving "Not a function error"

            globalEnvironmentVariableCollection
            .setup((c) => c.replace(TypeMoq.It.isAny(), TypeMoq.It.isAny(), TypeMoq.It.isAny()))
            .returns(() => Promise.resolve());

            environmentVariableCollection
            .setup((c) => c.replace(TypeMoq.It.isAny(), TypeMoq.It.isAny(), TypeMoq.It.isAny()))
            .returns(() => Promise.resolve());


           context
            .setup((c) =>
                c.environmentVariableCollection.replace(TypeMoq.It.isAny(), TypeMoq.It.isAny(), TypeMoq.It.isAny()),
            )
            .returns(() => Promise.resolve());

Edit:

   context
            .setup((c) =>
                c.environmentVariableCollection.replace(TypeMoq.It.isAny(), TypeMoq.It.isAny(), TypeMoq.It.isAny()),
            )
            .returns(() => Promise.resolve());

is a wrong way to set up when using typemoq. It may be right for ts-mockito but not for typemoq.

[Tyriar]

We have a hygiene rule in core to prevent this slipping in

[anthonykim1]

This is a good idea and I've made item on this: #24161
I see "local/code-no-test-only": "error", from vscode. Not sure if that local/code is something vscode repository specific, but I think something like:

{
  "plugins": ["mocha"],
  "rules": {
    "mocha/no-exclusive-tests": "error"
  }
}

works too