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To check Custom Permission and Other Features Check and modify the values of feature parameters, and to show or hide custom objects and custom permissions in your subscribers’ orgs. Syntax: FeatureManagement.checkPermission('CustomPermission_apiName'); Return Type: Boolean Example :  public   static   Boolean havingCperm =   FeatureManagement. checkPermission( apiName); OR if( FeatureManagement. checkPermission( apiName) ){your logic} ClickHere for More Details. For information about feature parameters, see “Get Started with the Feature Management App” in the  ISVforce Guide . In TestClass  to assign PermissionSet Use:  PermissionSet   ps  = [SELECT  Id , Name  FROM  PermissionSet  WHERE  Name  =  'apiName' ]; PermissionSetAssignment   psa  =  new   PermissionSetAssignment (); psa . AssigneeId  =  UserInfo . getUserId (); psa . PermissionSetId  =  ps . Id ; insert   psa ;