<template>
    <form class="wrapper" bindsubmit="testSubmit" report-submit="true">
        <button formType="submit"></button>
    </form>
</template>    
export default {
    methods:{
        testSubmit(e){
            console.log(e)
        }
    }
}

whether testSubmit is placed in methods or in the same level of create,onLoad, it prompts Do not have testSubmit handler