<lightning-button-menu onselect={onSelectMethod} class="edit-record-wrapper">
    <lightning-menu-item value="details" label="edit" class="edit-record-button"></lightning-menu-item>
</lightning-button-menu>

const buttonEl = element.shadowRoot.querySelector('.edit-record-button');
buttonEl.click();

wrapper.find('.event-menu-wrapper').simulate('change',{target:{'details}})