Rework time dilution in F3 tests and refine assertions

[masih]

Progress the clock during tests independently of condition check. Rework the assertions to use built-in eventual assertion. Use consistent names for the asserting functions.

Fixes #818
Fixes #847

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 67.14%. Comparing base (e232882) to head (26c7e26).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #862      +/-   ##
==========================================
- Coverage   67.28%   67.14%   -0.14%     
==========================================
  Files          84       84              
  Lines        9175     9175              
==========================================
- Hits         6173     6161      -12     
- Misses       2459     2467       +8     
- Partials      543      547       +4     

Files with missing lines	Coverage Δ
partial_msg.go	56.94% <100.00%> (+1.35%)	⬆️

... and 10 files with indirect coverage changes

[masih]

Hold off on reviews until I crack the intermittent failures on CI. Regardless, early feedback is always welcomed 🙏

[masih]

@Kubuxu this is ready for review whenever you get a chance. Thanks