chore: Export BASE_DIR environment variable

[lukebakken]

New users to asdf who wish to contribute will run into the following
errors when running ./scripts/test.bash:

 ✗ help should show dummy plugin help specific to version when version is present [7]
   (from function `setup_asdf_dir' in file test/test_helpers.bash, line 16,
    from function `setup' in test file test/help_command.bats, line 6)
     `setup_asdf_dir' failed
   mkdir: cannot create directory ‘/w spacetest_help_should_show_dummy_plugin_help_specific_to_version_when_version_is_present’: Permission denied

This is due to paths within the various test suites relying on the
BASE_DIR environment variable, which is not set by default.

This pull request modifies scripts/test.bash to correctly export
BASE_DIR

Note: I am a long-time asdf user, who would like to contribute to the
project and noticed this while setting up my dev environment on an
up-to-date Arch Linux system. My intention is to work on this issue:

#2042

[lukebakken]

I did search this project to find code, issues, etc concerning BASE_DIR -

https://github.com/search?q=repo%3Aasdf-vm%2Fasdf%20BASE_DIR&type=code

If I missed something obvious, apologies!

[Stratus3D]

Hi @lukebakken thanks for the PR. This behavior definitely needs to be fixed.

With the recent rewrite in Go only the Go tests should be run directly. One of the Go test files should run the BATS tests, and it does set the BASE_DIR environment variable before running them - https://github.com/asdf-vm/asdf/blob/master/cmd/asdf/main_test.go#L127.

I think we actually need to update (or remove) ./scripts/test.bash instead of setting BASE_DIR in another location.

[lukebakken]

With the recent rewrite in Go only the Go tests should be run directly. One of the Go test files should run the BATS tests, and it does set the BASE_DIR environment variable before running them

Yep, I sure missed that 😇

One advantage to being able to run the bats tests outside of go is that it allows running a subset of tests using -f. You don't need scripts/test.bash to do that, but it's nice to have.

[lukebakken]

@Stratus3D thanks for your review. Let me know what you think about the latest set of changes.

[Stratus3D]

@lukebakken looks like you are now just renaming the environment variable. I don't think that's needed.

[lukebakken]

I probably should have done two commits - rename, then this:

https://github.com/asdf-vm/asdf/pull/2045/files#diff-22a1a02b7da66d868b06d12332b26c446703bc3bed9808ab55893b50fe51260fR15

That export line is what addresses my original issue. Of course, I can revert the rename if you'd like.

[Stratus3D]

@lukebakken I would like the variable rename reverted as it feels like unnecessary code churn. The other change is good.

[lukebakken]

@Stratus3D done, thanks for the reviews.