Add missing Offer::expects_quantity to tests

[jkczyz]

No description provided.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.54%. Comparing base (da7a916) to head (7ceb709).
Report is 22 commits behind head on main.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3079      +/-   ##
==========================================
+ Coverage   89.79%   90.54%   +0.75%     
==========================================
  Files         116      117       +1     
  Lines       96466   100937    +4471     
  Branches    96466   100937    +4471     
==========================================
+ Hits        86619    91393    +4774     
+ Misses       7290     7089     -201     
+ Partials     2557     2455     -102     

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[tnull]

Seems straightforward increase of test strictness, merging without second reviewer.