Unit tests for db package

[gauravgahlot]

Description

The PR adds unit tests for db package.

Why is this needed

Increased unit test coverage.

Checklist:

I have:

• updated the documentation and/or roadmap (if required)
• added unit or e2e tests
• provided instructions on how to upgrade

[codecov]

Codecov Report

Merging #409 (086dda0) into master (ad5c929) will increase coverage by 8.52%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #409      +/-   ##
==========================================
+ Coverage   21.38%   29.90%   +8.52%     
==========================================
  Files          24       24              
  Lines        2170     2170              
==========================================
+ Hits          464      649     +185     
+ Misses       1664     1445     -219     
- Partials       42       76      +34     

Impacted Files	Coverage Δ
db/template.go	47.69% <0.00%> (+13.07%)	⬆️
db/workflow.go	26.53% <0.00%> (+26.32%)	⬆️
db/db.go	36.36% <0.00%> (+27.27%)	⬆️
db/hardware.go	30.27% <0.00%> (+30.27%)	⬆️

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[gianarb]

Such a nice way to start in 2021!! Thanks a lot!