explicitly sets tests that does not handle transaction fee

[tao-stones]

Problem

Tests expect zero transaction fee without be explicit about it.

Summary of Changes

• explicitly sets up tests with zero fee rate

Fixes #

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (8f9d915) 81.8% compared to head (cfb6906) 81.7%.
Report is 4 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##           master   #34847     +/-   ##
=========================================
- Coverage    81.8%    81.7%   -0.1%     
=========================================
  Files         825      825             
  Lines      223269   223271      +2     
=========================================
- Hits       182635   182619     -16     
- Misses      40634    40652     +18