test: fix flaky assertion on httptrace

[fredbi]

Change type

Please select: 🆕 New feature or enhancement|🔧 Bug fix'|📃 Documentation update

Short description

Fixes

Full description

Checklist

• I have signed all my commits with my name and email (see DCO. This does not require a PGP-signed commit
• I have rebased and squashed my work, so only one commit remains
• I have added tests to cover my changes.
• I have properly enriched go doc comments in code.
• I have properly documented any breaking change.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.45%. Comparing base (c925891) to head (070977a).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #456   +/-   ##
=======================================
  Coverage   83.45%   83.45%           
=======================================
  Files          62       62           
  Lines        4387     4388    +1     
=======================================
+ Hits         3661     3662    +1     
  Misses        567      567           
  Partials      159      159           

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