feat: fixed leak

[vcharmcaster]

Fix # leaks in unit test

For significant contributions please make sure you have completed the following items:

• Design discussion issue #
• Changes in public surface reviewed
• CHANGELOG.md updated

[vcharmcaster]

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[trask]

hi @vcharmcaster, I'd suggest reverting the try-with-resources around the (mock) exporters, since those are known to not require closing, and avoids additional indentation.

then will review the remaining, thx!

[vcharmcaster]

hi @vcharmcaster, I'd suggest reverting the try-with-resources around the (mock) exporters, since those are known to not require closing, and avoids additional indentation.

then will review the remaining, thx!

updated