test: copyedit test-tls-psk-alpn-callback-exception-handling

[aduh95]

Make the assertions more intention revealing

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.14%. Comparing base (e11b945) to head (da7d903).
⚠️ Report is 382 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #63485      +/-   ##
==========================================
- Coverage   90.14%   90.14%   -0.01%     
==========================================
  Files         718      718              
  Lines      227734   227734              
  Branches    42760    42757       -3     
==========================================
- Hits       205289   205280       -9     
- Misses      14219    14245      +26     
+ Partials     8226     8209      -17     

see 34 files with indirect coverage changes

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[Renegade334]

What happens if this fires while promise is being awaited at the end of the test function, and tlsClientError doesn't fire? Seems like the event will be handled outside of the test's promise task, promise won't be resolved or rejected, and the test will hang until timeout?

[aduh95]

node/test/common/index.js

Lines 563 to 572 in 5922197

	function mustNotCall(msg) {
	const callSite = getCallSites()[1];
	return function mustNotCall(...args) {
	const argsInfo = args.length > 0 ?
	`\ncalled with arguments: ${args.map((arg) => inspect(arg)).join(', ')}` : '';
	assert.fail(
	`${msg || 'function should not have been called'} at ${callSite.scriptName}:${callSite.lineNumber}` +
	argsInfo);
	};
	}

It would throw an unhandled rejection which would terminate the process immediately
In any case, a pending promise is not enough to keep the process alive, so no the test won't hang