chore(tests): add a missing assertion

[CommanderStorm]

This test could assert what the thrown error message is.
Now it does.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.73%. Comparing base (c422581) to head (5be941c).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1401   +/-   ##
=======================================
  Coverage   93.73%   93.73%           
=======================================
  Files         111      111           
  Lines        4626     4626           
  Branches     1557     1557           
=======================================
  Hits         4336     4336           
  Misses        290      290           

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[github-actions]

Size Change: 0 B

Total Size: 135 kB

ℹ️ View Unchanged

Filename	Size
dist/index.cjs	67.8 kB
dist/index.mjs	66.8 kB

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