Add some comments to CatalogTest

tests/CatalogTest.php

@@ -5,11 +5,26 @@
 use Mariadb\CatalogsPHP\Catalog;
 use PHPUnit\Framework\TestCase;
 
+/**
+ * Class PDOStatementMock
+ *
+ * A mock for the PDOStatement class
+ */
 class CatalogTest extends TestCase
 {
+    /**
+     * @var Catalog $catalog The Catalog instance to test
+     */
     private $catalog;
+
+    /**
+     * @var \PDO $pdoMock The PDO mock to inject into the Catalog instance
+     */
     private $pdoMock;
 
+    /**
+     * Set up the test
+     */
     protected function setUp(): void
     {
         // Create a mock for the PDO class
@@ -19,6 +34,9 @@ protected function setUp(): void
         $this->catalog = new Catalog('localhost', 3306, 'root', '', null, $this->pdoMock);
     }
 
+    /**
+     * Test the list method
+     */
     public function testList()
     {
         // Mock the PDOStatement for the 'SHOW CATALOGS' query
@@ -42,12 +60,18 @@ public function testList()
         ], $catalogs);
     }
 
+    /**
+     * Test the getPort method
+     */
     public function testGetPort()
     {
         $port = $this->catalog->getPort('test');
         $this->assertEquals(3306, $port);
     }
 
+    /**
+     * Test the create method
+     */
     public function testCreate()
     {
         // Configure the PDO mock to return the PDOStatement mock for the 'SHOW CATALOGS' query