Add test for preserveWatchOutput on command line #26873
Add test for preserveWatchOutput on command line
#26873

SaschaNaz/TypeScript,SaschaNaz/TypeScript,nojvek/TypeScript,Microsoft/TypeScript,minestarks/TypeScript,nojvek/TypeScript,kpreisser/TypeScript,kitsonk/TypeScript,weswigham/TypeScript,donaldpipowitch/TypeScript,kpreisser/TypeScript,minestarks/TypeScript,kitsonk/TypeScript,nojvek/TypeScript,Microsoft/TypeScript,kpreisser/TypeScript,RyanCavanaugh/TypeScript,microsoft/TypeScript,SaschaNaz/TypeScript,microsoft/TypeScript,kitsonk/TypeScript,basarat/TypeScript,alexeagle/TypeScript,SaschaNaz/TypeScript,alexeagle/TypeScript,donaldpipowitch/TypeScript,minestarks/TypeScript,weswigham/TypeScript,basarat/TypeScript,weswigham/TypeScript,alexeagle/TypeScript,RyanCavanaugh/TypeScript,nojvek/TypeScript,donaldpipowitch/TypeScript,donaldpipowitch/TypeScript,RyanCavanaugh/TypeScript,basarat/TypeScript,microsoft/TypeScript,Microsoft/TypeScript,basarat/TypeScript