@Before
public void setUp() {
    super.setUp()

    flash = [ : ]
    AddressController.metaClass.getFlash= { -> flash }

    params = [ : ]
    AddressController.metaClass.getParams = { -> params }

    redirectParams = [ : ]
    AddressController.metaClass.'static'.redirect = { Map args -> redirectParams = args }

    renderParams= [ : ]
    AddressController.metaClass.render = { Map args -> renderParams = args }

}

if(!quoteInstance) {
        flash.message = "Quote not found with id ${params.id}"
        redirect(action:list)
    }
    else {
        return [ quoteInstance : quoteInstance ]
    }
}

params['id'] = 123 ;

    Quote.metaClass.static.get = { int id ->
        assertEquals params.id, id
        return null
    }

    QuoteController cc = new QuoteController()
    cc.edit()

    assertEquals 'Quote not found with id 123', flash.message
    assertEquals cc.list, redirectParams.action
}