LivewireDuskHelpers.php

<?php

use Laravel\Dusk\Browser;

Browser::macro('waitUntilWire', function ($component, $key, $value, $seconds = null) {
    return $this->waitUsing($seconds, 100, function () use ($component, $key, $value) {
        return $value == $this->wireAttribute($component, $key);
    });
});

Browser::macro('waitUntilWireNot', function ($component, $key, $value, $seconds = null) {
    return $this->waitUsing($seconds, 100, function () use ($component, $key, $value) {
        return $value != $this->wireAttribute($component, $key);
    });
});

Browser::macro('wireAttribute', function ($component, $key) {
    return $this->driver->executeScript('
        return (component = window._.first(window._.filter(window.livewire.components.components(), {name: "' . $component . '"}))) ? component.data["' . $key . '"] : undefined;
    ');
});