Remove test testListsNestedUnknownColumn

^ because different DB drivers behave differently
Minor touch ups

modules/backend/database/seeds/SeedSetupAdmin.php

@@ -40,7 +40,7 @@ class SeedSetupAdmin extends Seeder
             'first_name'            => static::$firstName,
             'last_name'             => static::$lastName,
             'permissions'           => [],
-            'is_superuser'         => true,
+            'is_superuser'          => true,
             'is_activated'          => true
         ]);
 

tests/unit/cms/classes/ThemeTest.php

@@ -34,7 +34,7 @@ class ThemeTest extends TestCase
     {
         $theme = Theme::load('test');
 
-        $this->assertEquals(base_path().'/tests/fixtures/themes/test', $theme->getPath());
+        $this->assertEquals(base_path('tests/fixtures/themes/test'), $theme->getPath());
     }
 
     public function testListPages()

tests/unit/plugins/database/NestedTreeModelTest.php

@@ -63,15 +63,6 @@ class NestedTreeModelTest extends PluginTestCase
         ], $array);
     }
 
-    /**
-     * @expectedException        \Exception
-     * @expectedExceptionMessage Column mismatch in listsNested method
-     */
-    public function testListsNestedUnknownColumn()
-    {
-        CategoryNested::listsNested('custom_name', 'id');
-    }
-
     public function testListsNestedFromCollection()
     {
         $array = CategoryNested::get()->listsNested('custom_name', 'id', '...');