minor #21650 [Yaml] add tests for specific mapping keys (xabbuh)
minor #21650 [Yaml] add tests for specific mapping keys (xabbuh)

This PR was merged into the 2.7 branch.

Discussion
----------

[Yaml] add tests for specific mapping keys

| Q             | A
| ------------- | ---
| Branch?       | 2.7
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | see https://github.com/symfony/symfony/pull/21643#discussion_r101703130
| License       | MIT
| Doc PR        |

Commits
-------

b8e0d705f6 [Yaml] add tests for specific mapping keys

dmaicher/symfony,frankdejonge/symfony,MatTheCat/symfony,weaverryan/symfony,chalasr/symfony,neemzy/symfony,zcodes/symfony,kbond/symfony,SaschaDens/symfony,Triiistan/symfony,DavidGarciaCat/symfony,bendavies/symfony,Soullivaneuh/symfony,1ed/symfony,stof/symfony,csarrazi/symfony,hhamon/symfony,zerkms/symfony,Amo/symfony,pierredup/symfony,Engerim/symfony,Tobion/symfony,backbone87/symfony,klandaika/symfony,shieldo/symfony,xabbuh/symfony,Soullivaneuh/symfony,joelwurtz/symfony,romaricdrigon/symfony,michaelperrin/symfony,andreia/symfony,MatTheCat/symfony,Amo/symfony,frankdejonge/symfony,iltar/symfony,Soullivaneuh/symfony,Koc/symfony,alekitto/symfony,mvhirsch/symfony,mnapoli/symfony,mvhirsch/symfony,hacfi/symfony,hhamon/symfony,sstok/symfony,Nyholm/symfony,deguif/symfony,codeclimate-testing/symfony,Triiistan/symfony,gonzalovilaseca/symfony,damienalexandre/symfony,iltar/symfony,phramz/symfony,WhiteEagle88/symfony,jzawadzki/symfony,dmaicher/symfony,Triiistan/symfony,DavidGarciaCat/symfony,inso/symfony,d-ph/symfony,1ed/symfony,mweimerskirch/symfony,Deamon/symfony,lyrixx/symfony,damienalexandre/symfony,mihai-stancu/symfony,sstok/symfony,WhiteEagle88/symfony,bendavies/symfony,zorn-v/symfony,tucksaun/symfony,dmaicher/symfony,gnat42/symfony,jderusse/symfony,OndraM/symfony,HeahDude/symfony,symfony/symfony,zerkms/symfony,fabpot/symfony,nasimnabavi/symfony,kbond/symfony,arjenm/symfony,pyrech/symfony,gencer/symfony,curry684/symfony,localheinz/symfony,Tobion/symfony,Pierstoval/symfony,frankdejonge/symfony,gimler/symfony,e-moe/symfony,mihai-stancu/symfony,sroze/symfony,hacfi/symfony,romaricdrigon/symfony,dzuelke/symfony,arjenm/symfony,tucksaun/symfony,pierredup/symfony,gimler/symfony,Deamon/symfony,backbone87/symfony,localheinz/symfony,mnapoli/symfony,smatyas/symfony,arjenm/symfony,Aliance/symfony,yceruto/symfony,gonzalovilaseca/symfony,weaverryan/symfony,Einenlum/symfony,apetitpa/symfony,smatyas/symfony,paradajozsef/symfony,OndraM/symfony,maidmaid/symfony,Slamdunk/symfony,klandaika/symfony,mpdude/symfony,e-moe/symfony,dunglas/symfony,Pierstoval/symfony,d-ph/symfony,yceruto/symfony,chalasr/symfony,michaelperrin/symfony,xabbuh/symfony,jvasseur/symfony,hhamon/symfony,Pierstoval/symfony,jean-gui/symfony,tucksaun/symfony,ragboyjr/symfony,bendavies/symfony,ragboyjr/symfony,zorn-v/symfony,codeclimate-testing/symfony,jean-gui/symfony,teohhanhui/symfony,oleg-andreyev/symfony,Amo/symfony,derrabus/symfony,gnat42/symfony,oleg-andreyev/symfony,phramz/symfony,hhamon/symfony,joelwurtz/symfony,nasimnabavi/symfony,docteurklein/symfony,klandaika/symfony,zerkms/symfony,jvasseur/symfony,symfony/symfony,dunglas/symfony,teohhanhui/symfony,jakzal/symfony,DavidGarciaCat/symfony,lstrojny/symfony,dzuelke/symfony,zorn-v/symfony,mnapoli/symfony,sgehrig/symfony,mpdude/symfony,pyrech/symfony,csarrazi/symfony,hason/symfony,inso/symfony,shieldo/symfony,alekitto/symfony,klandaika/symfony,apetitpa/symfony,Deamon/symfony,lepiaf/symfony,inso/symfony,michaelperrin/symfony,hason/symfony,sstok/symfony,okdana/symfony,paradajozsef/symfony,Slamdunk/symfony,SpacePossum/symfony,okdana/symfony,nicolas-grekas/symfony,localheinz/symfony,gnat42/symfony,Einenlum/symfony,voronkovich/symfony,gimler/symfony,pyrech/symfony,Koc/symfony,Simperfit/symfony,nicolas-grekas/symfony,Triiistan/symfony,nicolas-grekas/symfony,tgalopin/symfony,localheinz/symfony,jderusse/symfony,neemzy/symfony,jakubsacha/symfony,zcodes/symfony,jakzal/symfony,shieldo/symfony,Soullivaneuh/symfony,mnapoli/symfony,mweimerskirch/symfony,mpdude/symfony,pierredup/symfony,voronkovich/symfony,Nyholm/symfony,Tobion/symfony,jakubsacha/symfony,SpacePossum/symfony,mihai-stancu/symfony,tucksaun/symfony,mvhirsch/symfony,dzuelke/symfony,ajgarlag/symfony,voronkovich/symfony,andreia/symfony,alekitto/symfony,andreia/symfony,zorn-v/symfony,vincentaubert/symfony,romaricdrigon/symfony,weaverryan/symfony,OndraM/symfony,pamil/symfony,gonzalovilaseca/symfony,aeoris/symfony,SaschaDens/symfony,vincentaubert/symfony,tgalopin/symfony,sroze/symfony,sgehrig/symfony,symfony/symfony,docteurklein/symfony,lyrixx/symfony,curry684/symfony,Soullivaneuh/symfony,SaschaDens/symfony,mweimerskirch/symfony,xabbuh/symfony,Koc/symfony,joelwurtz/symfony,shieldo/symfony,Aliance/symfony,Engerim/symfony,Simperfit/symfony,ro0NL/symfony,xabbuh/symfony,klandaika/symfony,Taluu/symfony,HeahDude/symfony,dmaicher/symfony,garak/symfony,pamil/symfony,ajgarlag/symfony,garak/symfony,aeoris/symfony,iltar/symfony,nicolas-grekas/symfony,Strate/symfony,Einenlum/symfony,zcodes/symfony,MatTheCat/symfony,deguif/symfony,inso/symfony,damienalexandre/symfony,stof/symfony,Koc/symfony,Nyholm/symfony,mnapoli/symfony,garak/symfony,andreia/symfony,SpacePossum/symfony,c960657/symfony,lepiaf/symfony,symfony/symfony,mvhirsch/symfony,ro0NL/symfony,mpdude/symfony,curry684/symfony,okdana/symfony,arjenm/symfony,1ed/symfony,jakubsacha/symfony,jean-gui/symfony,mweimerskirch/symfony,Taluu/symfony,d-ph/symfony,lstrojny/symfony,inso/symfony,paradajozsef/symfony,aeoris/symfony,OskarStark/symfony,Tobion/symfony,Slamdunk/symfony,zerkms/symfony,gencer/symfony,docteurklein/symfony,garak/symfony,ragboyjr/symfony,derrabus/symfony,sroze/symfony,maidmaid/symfony,e-moe/symfony,Triiistan/symfony,voronkovich/symfony,ogizanagi/symfony,MatTheCat/symfony,WhiteEagle88/symfony,OndraM/symfony,smatyas/symfony,1ed/symfony,kbond/symfony,kbond/symfony,SpacePossum/symfony,jakzal/symfony,jvasseur/symfony,Deamon/symfony,chalasr/symfony,Engerim/symfony,romaricdrigon/symfony,Taluu/symfony,tgalopin/symfony,smatyas/symfony,HeahDude/symfony,teohhanhui/symfony,Simperfit/symfony,andrerom/symfony,dunglas/symfony,SpacePossum/symfony,weaverryan/symfony,d-ph/symfony,Strate/symfony,smatyas/symfony,pamil/symfony,OskarStark/symfony,gonzalovilaseca/symfony,jderusse/symfony,gimler/symfony,yceruto/symfony,lepiaf/symfony,frankdejonge/symfony,paradajozsef/symfony,c960657/symfony,maidmaid/symfony,mihai-stancu/symfony,Deamon/symfony,nasimnabavi/symfony,chalasr/symfony,joelwurtz/symfony,ajgarlag/symfony,teohhanhui/symfony,Taluu/symfony,docteurklein/symfony,HeahDude/symfony,Strate/symfony,apetitpa/symfony,derrabus/symfony,damienalexandre/symfony,michaelperrin/symfony,sstok/symfony,OskarStark/symfony,andrerom/symfony,ogizanagi/symfony,ro0NL/symfony,sgehrig/symfony,OndraM/symfony,sgehrig/symfony,Pierstoval/symfony,lyrixx/symfony,lyrixx/symfony,Amo/symfony,csarrazi/symfony,OskarStark/symfony,Aliance/symfony,pierredup/symfony,e-moe/symfony,mvhirsch/symfony,bendavies/symfony,maidmaid/symfony,apetitpa/symfony,Simperfit/symfony,sstok/symfony,hason/symfony,dzuelke/symfony,ragboyjr/symfony,codeclimate-testing/symfony,josephdpurcell/symfony,codeclimate-testing/symfony,fabpot/symfony,fabpot/symfony,gencer/symfony,phramz/symfony,stof/symfony,jvasseur/symfony,fabpot/symfony,derrabus/symfony,SaschaDens/symfony,hacfi/symfony,docteurklein/symfony,alekitto/symfony,phramz/symfony,mweimerskirch/symfony,zcodes/symfony,SaschaDens/symfony,josephdpurcell/symfony,c960657/symfony,mihai-stancu/symfony,vincentaubert/symfony,iltar/symfony,andrerom/symfony,sroze/symfony,Slamdunk/symfony,oleg-andreyev/symfony,jzawadzki/symfony,tgalopin/symfony,backbone87/symfony,oleg-andreyev/symfony,ajgarlag/symfony,jzawadzki/symfony,andrerom/symfony,nasimnabavi/symfony,pyrech/symfony,vincentaubert/symfony,deguif/symfony,Simperfit/symfony,c960657/symfony,jean-gui/symfony,pamil/symfony,ro0NL/symfony,lstrojny/symfony,jakzal/symfony,neemzy/symfony,deguif/symfony,gnat42/symfony,jakubsacha/symfony,jderusse/symfony,yceruto/symfony,Amo/symfony,Nyholm/symfony,stof/symfony,ogizanagi/symfony,ogizanagi/symfony,josephdpurcell/symfony,jakubsacha/symfony,Einenlum/symfony,curry684/symfony,dzuelke/symfony