test: add test for getVersion()

tests/system/Database/Live/GetVersionTest.php

@@ -0,0 +1,34 @@
+<?php
+
+/**
+ * This file is part of CodeIgniter 4 framework.
+ *
+ * (c) CodeIgniter Foundation <admin@codeigniter.com>
+ *
+ * For the full copyright and license information, please view
+ * the LICENSE file that was distributed with this source code.
+ */
+
+namespace CodeIgniter\Database\Live;
+
+use CodeIgniter\Test\CIUnitTestCase;
+use CodeIgniter\Test\DatabaseTestTrait;
+
+/**
+ * @group DatabaseLive
+ *
+ * @internal
+ */
+final class GetVersionTest extends CIUnitTestCase
+{
+    use DatabaseTestTrait;
+
+    protected $migrate = false;
+
+    public function testGetVersion()
+    {
+        $version = $this->db->getVersion();
+
+        $this->assertMatchesRegularExpression('/\A\d+(\.\d+)*\z/', $version);
+    }
+}