question: protected boolean osFileMove ( File dest , File source ) { if ( source . renameTo ( dest ) ) { return true ; } if ( source . exists ( ) && source . isFile ( ) && source . canRead ( ) && source . canWrite ( ) && ! dest . exists ( ) ) { if ( osFileCopy ( dest , source ) ) { if ( osDeleteFile ( source ) ) { return true ; } else { osDeleteFile ( dest ) ; } } } return false ; }
target:  can be replaced by mock/stub in unittests 