Api tests2 (#5098)

* Cleanup

* API tests for asset models and related cleanup/improvements

* Api license test.  Tests incomplete because create/update/destroy are not implemented yet in the controller

* API Category tests.

* Manufacturers API Test.

* Implement License Create/Update/Delete Methods for API and enable test.

* Add missing gate for api.  Fixes only superadmins being able to generate Personal Access Toekns

app/Models/AssetModel.php

@@ -55,7 +55,18 @@ class AssetModel extends SnipeModel
      *
      * @var array
      */
-    protected $fillable = ['name','manufacturer_id','category_id','eol', 'user_id', 'fieldset_id', 'model_number', 'notes'];
+    protected $fillable = [
+        'category_id',
+        'depreciation_id',
+        'eol',
+        'fieldset_id',
+        'image',
+        'manufacturer_id',
+        'model_number',
+        'name',
+        'notes',
+        'user_id',
+    ];
 
     public function assets()
     {