test: add markTestSkipped() and remove DatabaseTestTrait

Author: kenjis

tests/system/Database/Live/SQLite3/GetIndexDataTest.php

@@ -14,7 +14,6 @@
 use CodeIgniter\Database\SQLite3\Connection;
 use CodeIgniter\Database\SQLite3\Forge;
 use CodeIgniter\Test\CIUnitTestCase;
-use CodeIgniter\Test\DatabaseTestTrait;
 use Config\Database;
 use stdClass;
 
@@ -25,15 +24,6 @@
  */
 final class GetIndexDataTest extends CIUnitTestCase
 {
-    use DatabaseTestTrait;
-
-    /**
-     * In setUp() db connection is changed. So migration doesn't work
-     *
-     * @var bool
-     */
-    protected $migrate = false;
-
     /**
      * @var Connection
      */
@@ -45,6 +35,11 @@ protected function setUp(): void
     {
         parent::setUp();
 
+        $this->db = Database::connect($this->DBGroup);
+        if ($this->db->DBDriver !== 'SQLite3') {
+            $this->markTestSkipped('This test is only for SQLite3.');
+        }
+
         $config = [
             'DBDriver' => 'SQLite3',
             'database' => 'database.db',