Convert done callbacks to async/await in the smaller unit test files

[timvandermeij]

This commit series is the next step (after PR #13216) in getting rid of the outdated done callbacks by converting to async/await instead. Not using callbacks and having less indentation/code makes the overall code a bit easier to read. I have purposely done the smaller files first to make it easier to review.

[timvandermeij]

/botio unittest

[pdfjsbot]

From: Bot.io (Linux m4)

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Command cmd_unittest from @timvandermeij received. Current queue size: 0

Live output at: http://54.67.70.0:8877/b30a811cf91b1ae/output.txt

[pdfjsbot]

From: Bot.io (Windows)

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Received

Command cmd_unittest from @timvandermeij received. Current queue size: 0

Live output at: http://3.101.106.178:8877/6c79b0d5b521798/output.txt

[pdfjsbot]

From: Bot.io (Linux m4)

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Success

Full output at http://54.67.70.0:8877/b30a811cf91b1ae/output.txt

Total script time: 3.67 mins

• Unit Tests: Passed

[pdfjsbot]

From: Bot.io (Windows)

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Success

Full output at http://3.101.106.178:8877/6c79b0d5b521798/output.txt

Total script time: 5.53 mins

• Unit Tests: Passed

[Snuffleupagus]

Thanks for taking this on!

I've only looked briefly at the first two commits, and found two possible bigger picture issues; hence I'm holding off on doing a full review since I guess that these problems might occur elsewhere too.

[timvandermeij]

/botio unittest

[pdfjsbot]

From: Bot.io (Linux m4)

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Received

Command cmd_unittest from @timvandermeij received. Current queue size: 1

Live output at: http://54.67.70.0:8877/e53de17cb7914bb/output.txt

[pdfjsbot]

From: Bot.io (Windows)

---

Received

Command cmd_unittest from @timvandermeij received. Current queue size: 1

Live output at: http://3.101.106.178:8877/e0d3d81bde4b7ed/output.txt

[pdfjsbot]

From: Bot.io (Linux m4)

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Success

Full output at http://54.67.70.0:8877/e53de17cb7914bb/output.txt

Total script time: 3.91 mins

• Unit Tests: Passed

[pdfjsbot]

From: Bot.io (Windows)

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Success

Full output at http://3.101.106.178:8877/e0d3d81bde4b7ed/output.txt

Total script time: 13.67 mins

• Unit Tests: Passed

[Snuffleupagus]

This isn't just less code, but it's much nicer to look at compared to the callback functions everywhere :-)

Thank you for doing this, and please continue with the rest of the unit-tests when you've got the time!

[timvandermeij]

Will do, thanks!