test: improve reliability of http2-session-timeout

Check actual expired time rather than relying on a number of calls to
setTimeout() in test-http2-session-timeout more robust.
PR-URL: #20692Fixes: #20628
Reviewed-By: Anatoli Papirovski <apapirovski@mac.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: James M Snell <jasnell@gmail.com>

Author: Trott

test/sequential/test-http2-session-timeout.js

@@ -7,7 +7,6 @@ const h2 = require('http2');
 
 constserverTimeout=common.platformTimeout(200);
 constcallTimeout=common.platformTimeout(20);
-constminRuns=Math.ceil(serverTimeout/callTimeout)*2;
 constmustNotCall=common.mustNotCall();
 
 constserver=h2.createServer();
@@ -21,9 +20,10 @@ server.listen(0, common.mustCall(() => {
 
 consturl=`http://localhost:${port}`;
 constclient=h2.connect(url);
-makeReq(minRuns);
+conststartTime=process.hrtime();
+makeReq();
 
-functionmakeReq(attempts){
+functionmakeReq(){
 constrequest=client.request({
 ':path': '/foobar',
 ':method': 'GET',
@@ -34,12 +34,14 @@ server.listen(0, common.mustCall(() => {
 request.end();
 
 request.on('end',()=>{
-if(attempts){
-setTimeout(()=>makeReq(attempts-1),callTimeout);
+constdiff=process.hrtime(startTime);
+constmilliseconds=(diff[0]*1e3+diff[1]/1e6);
+if(milliseconds<serverTimeout*2){
+setTimeout(makeReq,callTimeout);
 }else{
 server.removeListener('timeout',mustNotCall);
-client.close();
 server.close();
+client.close();
 }
 });
 }