refact file acquisition tests: prevent data race

[mmetc]

No description provided.

[github-actions]

@mmetc: There are no area labels on this PR. You can add as many areas as you see fit.

• /area agent
• /area local-api
• /area cscli
• /area appsec
• /area security
• /area configuration

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 46.28%. Comparing base (9f63c1c) to head (5a97530).

❗ There is a different number of reports uploaded between BASE (9f63c1c) and HEAD (5a97530). Click for more details.

HEAD has 2 uploads less than BASE

Flag	BASE (9f63c1c)	HEAD (5a97530)
unit-windows	1	0
unit-linux	1	0

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #3957       +/-   ##
===========================================
- Coverage   62.57%   46.28%   -16.30%     
===========================================
  Files         453      431       -22     
  Lines       33039    31903     -1136     
===========================================
- Hits        20673    14765     -5908     
- Misses      10239    15348     +5109     
+ Partials     2127     1790      -337     

Flag	Coverage Δ
bats	46.28% <ø> (+0.04%)	⬆️
unit-linux	?
unit-windows	?

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