Chore/lift coverage to 70

[NicolaMirchev]

Description:

Added more unit tests in different files

This PR modifies couple of test files in order get the coverage higher

Added tests for:

• account_info.go
• assessed_custom_fee.go
• contract_create_flow.go
• system_delete_transaction.go
• system_undelete_transaction.go

Related issue(s):
(#703 (comment))

[codecov]

Codecov Report

Attention: 9 lines in your changes are missing coverage. Please review.

Comparison is base (e97ed41) 69.75% compared to head (6049d8d) 70.69%.
Report is 3 commits behind head on develop.

❗ Current head 6049d8d differs from pull request most recent head dfad911. Consider uploading reports for the commit dfad911 to get more accurate results

Files	Patch %	Lines
account_id.go	76.31%	7 Missing and 2 partials ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #827      +/-   ##
===========================================
+ Coverage    69.75%   70.69%   +0.93%     
===========================================
  Files          164      164              
  Lines        34094    34126      +32     
===========================================
+ Hits         23782    24124     +342     
+ Misses        8943     8610     -333     
- Partials      1369     1392      +23     

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[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication