feat: dpki unit test

[lc3091]

Proposed changes in this pull request

Explain the changes in this pull request in order to help the project maintainers understand the overall impact of it.

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Type

• Bug fix: (Link to the issue #{issue No.})
• Feature (Non-breaking change)
• Feature (Breaking change)
• Documentation Improvement

Checklist

Write a small comment explaining if its N/A (not applicable)

• Read the CONTRIBUTION.
• All the tests are passing after the introduction of new changes.
• Added tests respective to the part of code I have written.
• Added proper documentation where ever applicable.
• Code has been written according to Golang-Style-Guide

Extra information

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[codecov]

Codecov Report

Merging #919 into master will increase coverage by 2.77%.
The diff coverage is 46.92%.

@@            Coverage Diff             @@
##           master     #919      +/-   ##
==========================================
+ Coverage   41.01%   43.78%   +2.77%     
==========================================
  Files         258      266       +8     
  Lines       37476    42247    +4771     
==========================================
+ Hits        15369    18498    +3129     
- Misses      19138    20072     +934     
- Partials     2969     3677     +708

Flag	Coverage Δ
#unittests	43.78% <46.92%> (+2.77%)	⬆️

Impacted Files	Coverage Δ
common/types/address.go	63.11% <ø> (ø)	⬆️
vm/contract/contract.go	8.62% <ø> (+8.62%)	⬆️
vm/contract/abi/abi_settlement_gen.go	41.86% <ø> (ø)
ledger/relation/relation_impl.go	38.24% <ø> (ø)	⬆️
common/types/hash.go	28.05% <0%> (-1.05%)	⬇️
common/genesis.go	0% <0%> (ø)	⬆️
common/types/pov_algo.go	0% <0%> (ø)	⬆️
common/types/block_pov.go	0% <0%> (ø)	⬆️
vm/contract/public_key_distribution.go	42.08% <0%> (-0.17%)	⬇️
common/params_pov.go	0% <0%> (ø)
... and 51 more

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