đã tạo được test case của createUser

vendor/laravel/dusk/src/Dusk.php

@@ -0,0 +1,64 @@
+<?php
+
+namespace Laravel\Dusk;
+
+use InvalidArgumentException;
+
+class Dusk
+{
+    /**
+     * The Dusk selector (@dusk) HTML attribute.
+     *
+     * @var string
+     */
+    public static $selectorHtmlAttribute = 'dusk';
+
+    /**
+     * Register the Dusk service provider.
+     *
+     * @param  array  $options
+     * @return void
+     */
+    public static function register(array $options = [])
+    {
+        if (static::duskEnvironment($options)) {
+            app()->register(DuskServiceProvider::class);
+        }
+    }
+
+    /**
+     * Determine if Dusk may run in this environment.
+     *
+     * @param  array  $options
+     * @return bool
+     *
+     * @throws \InvalidArgumentException
+     */
+    protected static function duskEnvironment($options)
+    {
+        if (! isset($options['environments'])) {
+            return false;
+        }
+
+        if (is_string($options['environments'])) {
+            $options['environments'] = [$options['environments']];
+        }
+
+        if (! is_array($options['environments'])) {
+            throw new InvalidArgumentException('Dusk environments must be listed as an array.');
+        }
+
+        return app()->environment(...$options['environments']);
+    }
+
+    /**
+     * Set the Dusk selector (@dusk) HTML attribute.
+     *
+     * @param  string  $attribute
+     * @return void
+     */
+    public static function selectorHtmlAttribute(string $attribute)
+    {
+        static::$selectorHtmlAttribute = $attribute;
+    }
+}