test: improve test-tls-set-encoding.js

[anonrig]

There is almost no place in node.js test suite that validates the amount of time secureConnect event is emitted. Let's change that.

[lpinca]

See https://github.com/nodejs/node/tree/cb5f671a34da32e3c2d70d7f3e7f869cda6b806b/test/common#mustcallfn-exact

client.on('secureConnect', common.mustCall(() => {
  console.log('client: on secureConnect');
}));

already verifies that the event is emitted exactly once.

[anonrig]

Ah nice. Thanks @lpinca

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.25%. Comparing base (795dd8e) to head (636493c).
Report is 34 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #57900      +/-   ##
==========================================
+ Coverage   90.24%   90.25%   +0.01%     
==========================================
  Files         630      630              
  Lines      185470   185781     +311     
  Branches    36375    36421      +46     
==========================================
+ Hits       167371   167675     +304     
- Misses      10993    10999       +6     
- Partials     7106     7107       +1     

see 53 files with indirect coverage changes

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