refactor: Move getDb method to a new location in TestCase.php for improved organization.

Author: terabytesoftw

tests/TestCase.php

@@ -92,14 +92,6 @@ protected function setUp(): void
         $this->mockConsoleApplication();
     }
 
-    /**
-     * Returns the database connection used for tests.
-     */
-    protected function getDb(): Connection
-    {
-        return Yii::$app->getDb();
-    }
-
     /**
      * Asserts that a list of tree nodes matches the expected order.
      *
@@ -387,6 +379,14 @@ protected function getDataSetMultipleTree(): array
         return array_values($dataSetMultipleTree);
     }
 
+    /**
+     * Returns the database connection used for tests.
+     */
+    protected function getDb(): Connection
+    {
+        return Yii::$app->getDb();
+    }
+
     /**
      * Returns a dataset containing only {@see Tree} nodes.
      *