test(blockchain): add missing paths test

[sleepdefic1t]

Should bring coverage back up to 100%

What kind of change does this PR introduce?

• Tests

Does this PR introduce a breaking change?

• Yes
• No

Does this PR release a new version?

• Yes
• No

If yes, please describe the impact and migration path for existing applications:

The PR fulfills these requirements:

• It's submitted to the develop branch, not the master branch
• All tests are passing
• New/updated tests are included

[codecov-io]

Codecov Report

Merging #106 into develop will increase coverage by 2.4%.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop   #106     +/-   ##
========================================
+ Coverage     97.6%   100%   +2.4%     
========================================
  Files           15     15             
  Lines          250    250             
========================================
+ Hits           244    250      +6     
+ Misses           6      0      -6

Impacted Files	Coverage Δ
src/api/paths.cpp	100% <0%> (+3.72%)	⬆️

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