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When migrating an Apex class, should its test class be migrated too?

Please pardon this newbie question and provide the link if this has been answered before


I develop an Apex class X. I write another Apex class Y as a test class of X. When I migrate X to production, do I have to migrate Y too?



Best Answer chosen by Admin (Salesforce Developers) 
Yes.  When migrating to production, all of the tests are run and the coverage needs to satisfy the 75%.  If the test is not there already then you need to migrate it.