test: invalid callback for client connect/upgrade

[trivikr]

Adds unit tests for:

• Line 15 of lib/api/api-connect.js
• Line 16 of lib/api/api-upgrade.js

[codecov-commenter]

Codecov Report

Merging #798 (3ccf752) into main (e0f0bad) will increase coverage by 0.09%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #798      +/-   ##
==========================================
+ Coverage   99.75%   99.85%   +0.09%     
==========================================
  Files          26       26              
  Lines        2009     2009              
==========================================
+ Hits         2004     2006       +2     
+ Misses          5        3       -2     

Impacted Files	Coverage Δ
lib/api/api-upgrade.js	100.00% <0.00%> (+2.17%)	⬆️
lib/api/api-connect.js	100.00% <0.00%> (+2.32%)	⬆️

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[mcollina]

lgtm