Add validation model test

Refs #2676

tests/fixtures/plugins/database/tester/models/Post.php

@@ -4,7 +4,6 @@ use Model;
 
 class Post extends Model
 {
-
     /**
      * @var string The database table used by the model.
      */
@@ -122,3 +121,13 @@ class RevisionablePost extends Post
     }
 
 }
+
+class ValidationPost extends Post
+{
+    use \October\Rain\Database\Traits\Validation;
+
+    public $rules = [
+        'title' => 'required|min:3|max:255',
+        'slug' => ['required', 'regex:/^[a-z0-9\/\:_\-\*\[\]\+\?\|]*$/i', 'unique:database_tester_posts'],
+    ];
+}

tests/unit/plugins/database/ModelTest.php

@@ -31,4 +31,4 @@ class ModelTest extends PluginTestCase
     {
         Post::create(['title' => 'Hi!', 'slug' => 'authenticity']);
     }
-}
+}

tests/unit/plugins/database/ValidationModelTest.php

@@ -0,0 +1,35 @@
+<?php
+
+use Database\Tester\Models\ValidationPost;
+
+class ValidationModelTest extends PluginTestCase
+{
+    public function setUp()
+    {
+        parent::setUp();
+
+        include_once base_path().'/tests/fixtures/plugins/database/tester/models/Post.php';
+
+        $this->runPluginRefreshCommand('Database.Tester');
+    }
+
+    /**
+     * @expectedException October\Rain\Database\ModelException
+     */
+    public function test_slug_has_to_be_unique()
+    {
+        $post = ValidationPost::create([
+            'title' => 'This is a new post',
+            'slug' => 'post-1',
+            'description' => 'Testing...'
+        ]);
+
+        $this->assertNotFalse($post);
+
+        $post2 = ValidationPost::create([
+            'title' => 'this is another post with the same slug',
+            'slug' => 'post-1',
+            'description' => 'testing....'
+        ]);
+    }
+}