Tests: state loader tests

[devbugging]

Description

Add more tests for state loader.

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For contributor use:

• Targeted PR against master branch
• Linked to Github issue with discussion and accepted design OR link to spec that describes this work
• Code follows the standards mentioned here
• Updated relevant documentation
• Re-reviewed Files changed in the Github PR explorer
• Added appropriate labels

[codecov-commenter]

Codecov Report

Merging #412 (25ab3b9) into master (f3eb6a1) will increase coverage by 0.26%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #412      +/-   ##
==========================================
+ Coverage   55.24%   55.50%   +0.26%     
==========================================
  Files          36       36              
  Lines        1906     1906              
==========================================
+ Hits         1053     1058       +5     
+ Misses        718      711       -7     
- Partials      135      137       +2     

Flag	Coverage Δ
unittests	55.50% <ø> (+0.26%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
pkg/flowkit/state.go	60.41% <0.00%> (+5.20%)	⬆️

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[janezpodhostnik]

LGTM!